Zoology Questions

Zoology Questions and Answers for Interview

1. Which of the following organism is iteroparous ?
(A) Pacific salmon fish 
(B) Virus
(C) Bacteria 
(D) Humans
Ans : (D)

2. A micromutation is—
(A) Polyploidy
(B) Addition of chromosome
(C) Deletion of chromosome
(D) Change in gene frequency
Ans : (D)

3. The limited period of sexual receptivity that occurs around the time of ovulation in all female mammals except humans is called—
(A) Menstruation 
(B) Luteinization
(C) Oogenesis 
(D) Estrus
Ans : (D)

4. The rate and force of the heart-beat, and the secretion of digestive glands are controlled by—
(A) Central nervous system
(B) Spinal nerves
(C) Cranial nerves
(D) Autonomic nervous system
Ans : (D)

5. Glycosidic bond is broken during digestion of—
(A) Protein 
(B) Starch
(C) Lipid 
(D) All the above
Ans : (B)

6. Postganglionic parasympathetic fibres are—
(A) Adrenergic 
(B) Cholinergic
(C) Both (A) and (B) 
(D) None of these
Ans : (B)

7. In glycosuria disorder, urine contains—
(A) Amino acid 
(B) Inorganic ions
(C) Glucose 
(D) Epithelial cells
Ans : (C)

8. Mammillary bodies are attached to the ventral side of—
(A) Olfactory lobe
(B) Cerebral hemisphere
(C) Diencephalon
(D) Medulla oblongata
Ans : (C)

9. Argentaffin cells are associated with—
(A) Tumour 
(B) Heart muscle
(C) Pericardium 
(D) Pelvis of kidney
Ans : (A)

10. Sweating on palm and sole due to psychic stimuli is called—
(A) Bradykinin 
(B) Blushing
(C) Cold sweat 
(D) None of these
Ans : (C)

11. Capsule of Tenon is associated with—
(A) Eyeball 
(B) Brain
(C) Skin 
(D) Kidney
Ans : (A)

12. Which of the following law is associated with the fact that anterior spinal nerve roots contain only motor fibres and posterior roots only sensory fibres ?
(A) Magendie’s law 
(B) Bell’s law
(C) Both (A) and (B) 
(D) None of these
Ans : (C)

13. In birds—
(A) Left oviduct and right aortic arch are present
(B) Left oviduct and left aortic arch are present
(C) Right oviduct, left ovary and right aortic arch are present
(D) Left oviduct, left ovary and right aortic arch are present
Ans : (B)

14. Ancestral amphibians were tetrapods that evolved during—
(A) Devonian period
(B) Carboniferous period
(C) Jurassic period
(D) Cretaceous period
Ans : (B)

15. Community health services involves—
(A) Control of communicable diseases
(B) School and health education
(C) Awareness of clean environment
(D) All the above
Ans : (D)

16. The active rolling over of endodermal and mesodermal cells from the embryo surface into the interior is defined as—
(A) Ingression 
(B) Involution
(C) Epiboly 
(D) Inversion
Ans : (B)

17. The wall of heart is made up of—
(A) Epicardium 
(B) Myocardium
(C) Endocardium 
(D) All the above
Ans : (D)

18. Genetic counsellors can identify heterozygous individuals by—
(A) Height of individual
(B) Colour of individual
(C) Screening procedures
(D) All the above
Ans : (C)

19. Which of the following enzyme is secreted by intestinal mucosa that remain closely associated with the microvilli ?
(A) Peptidase 
(B) Disaccharidase
(C) Trypsin 
(D) Both (A) and (B)
Ans : (D)

20. Which of the following is absorbed by intestinal mucosa by active transport ?
(A) Galactose 
(B) Glucose
(C) Fructose 
(D) Both (A) and (B)
Ans : (D)

Zoology : Solved Paper

Zoology : Solved Paper

1. Bruch’s membrane is found in—
(A) Inner ear (B) Uvea of eye
(C) Testes (D) Pancreas

2. Which part of brain allows one side of brain to control opposite side of body ?
(A) Midbrain (B) Medulla
(C) Cerebellum (D) Pons

3. Fetuin is found in—
(A) Foetus (B) Liver
(C) Spleen (D) None of these

4. Hensen’s body is associated with—
(A) Retina of eye (B) Organ of Corti
(C) Heart (D) Skin

5. Sensory receptor of warmth located principally at the lip of fingers is known as—
(A) Ruffini’s corpuscles (B) Organ of Zuckerkandl
(C) Organ of Giraldes (D) Weber’s organ

6. Which of the following is basic amino acid ?
(A) Alanine (B) Aspartic acid
(C) Asparagine (D) Arginine

7. Which of the following amino acid is sulphurbearing compound ?
(A) Methionine (B) Alanine
(C) Aspartic acid (D) Arginine

8. Negri bodies are associated with—
(A) Rabies (B) Typhoid
(C) Tuberclosis (D) Hepatitis

9. Schultze’s bundle is associated with—
(A) Brain (B) Spinal cord
(C) Heart (D) None of these

10. Schlemm’s canal is present in—
(A) Eye (B) Cochlea
(C) Spinal cord (D) Vertebrae

11. Capsule of Tenon is associated with—
(A) Eyeball (B) Brain
(C) Skin (D) Kidney

12. Which of the following law is associated with the fact that anterior spinal nerve roots contain only motor fibres and posterior roots only sensory fibres ?
(A) Magendie’s law (B) Bell’s law
(C) Both (A) and (B) (D) None of these

13. In birds—
(A) Left oviduct and right aortic arch are present
(B) Left oviduct and left aortic arch are present
(C) Right oviduct, left ovary and right aortic arch are present
(D) Left oviduct, left ovary and right aortic arch are present

14. Ancestral amphibians were tetrapods that evolved during—
(A) Devonian period (B) Carboniferous period
(C) Jurassic period (D) Cretaceous period

15. Community health services involves—
(A) Control of communicable diseases (B) School and health education
(C) Awareness of clean environment (D) All the above

16. The active rolling over of endodermal and mesodermal cells from the embryo surface 
into the interior is defined as—
(A) Ingression (B) Involution
(C) Epiboly (D) Inversion

17. The wall of heart is made up of—
(A) Epicardium (B) Myocardium
(C) Endocardium (D) All the above

18. Genetic counsellors can identify heterozygous individuals by—
(A) Height of individual (B) Colour of individual
(C) Screening procedures (D) All the above

19. Which of the following enzyme is secreted by intestinal mucosa that remain closely associated with the microvilli ?
(A) Peptidase (B) Disaccharidase
(C) Trypsin (D) Both (A) and (B)

20. Which of the following is absorbed by intestinal mucosa by active transport ?
(A) Galactose (B) Glucose
(C) Fructose (D) Both (A) and (B)

21. A starving person consumes first—
(A) Body fats (B) Body proteins
(C) Vitamins (D) Stored glycogen

22. The functional unit of contractile system in striated muscle is—
(A) Cross bridges (B) Sarcomeres
(C) Myofibril (D) Z-band

23. Globular proteins undergo structural changes in response to extremes of pH or temperature, is called—
(A) Renaturation (B) Denaturation
(C) Combination (D) Both (A) and (B)

24. The study of relationships between size and shape is known as—
(A) Allometry (B) Heterochrony
(C) Isometry (D) Allochrony

25. A localised tumour covered by connective tissue is called—
(A) Metastasis (B) Neoplasm
(C) Benign tumour (D) Malignant tumour

26. Hürthle cell is associated with—
(A) Thyroid gland (B) Pituitary gland
(C) Adrenal gland (D) Pancreas

27. A metastatic cancerous tumour is termed ‘sarcoma’, if the disorder is in—
(A) Immune system (B) Epithelial cells
(C) Fibroblasts (D) Circulatory system

28. Graft between isogenic individuals is known as—
(A) Syngraft (B) Allograft
(C) Xenograft (D) None of these

29. The most striking example of point mutation is found in a disorder called—
(A) Thalassemia (B) Nightblindness
(C) Down’s syndrome (D) Sickle-cell anaemia

30. The phenomenon of ‘industrial melanism’ demonstrates—
(A) Natural selection (B) Induced mutation
(C) Reproductive isolation (D) Geographical isolation

31. Overproduction of which of the following neurotransmitter has been associated with the mental disorder ‘Schizophrenia’ ?
(A) Acetylcholine (B) GABA
(C) Dopamine (D) Serotonin

32. Milk tastes sour when kept in the open for sometime due to for-mation of—
(A) Carbonic acid (B) Lactic acid
(C) Citric acid (D) Malic acid

33. Red tide is caused by—
(A) Protozoans (B) Corals
(C) Dinoflagellates (D) All the above

34. A type of hypersensitivity to allergen in which humoral antibodies attach to mast cells and basophils, may result in circulatory shock, is called—
(A) Orthopnea (B) Anaphylaxis
(C) Rhinitis (D) Immunologic surveillance

35. Organisms with very high intrinsic growth rates have—
(A) Long generation times (B) Short generation times
(C) No courtship behaviours (D) No carrying capacity

36. Which of the following organism is iteroparous ?
(A) Pacific salmon fish (B) Virus
(C) Bacteria (D) Humans

37. A micromutation is—
(A) Polyploidy (B) Addition of chromosome
(C) Deletion of chromosome (D) Change in gene frequency

38. The limited period of sexual receptivity that occurs around the time of ovulation in all
female mammals except humans is called—
(A) Menstruation (B) Luteinization
(C) Oogenesis (D) Estrus

39. The rate and force of the heart-beat, and the secretion of digestive glands are controlled by—
(A) Central nervous system (B) Spinal nerves
(C) Cranial nerves (D) Autonomic nervous system

40. Glycosidic bond is broken during digestion of—
(A) Protein (B) Starch
(C) Lipid (D) All the above

41. Postganglionic parasympathetic fibres are—
(A) Adrenergic (B) Cholinergic
(C) Both (A) and (B) (D) None of these

42. In glycosuria disorder, urine contains—
(A) Amino acid (B) Inorganic ions
(C) Glucose (D) Epithelial cells

43. Mammillary bodies are attached to the ventral side of—
(A) Olfactory lobe (B) Cerebral hemisphere
(C) Diencephalon (D) Medulla oblongata

44. Argentaffin cells are associated with—
(A) Tumour (B) Heart muscle
(C) Pericardium (D) Pelvis of kidney

45. Sweating on palm and sole due to psychic stimuli is called—
(A) Bradykinin (B) Blushing
(C) Cold sweat (D) None of these

46. Inherited Rh gene is found in—
(A) Rh⁺ individuals (B) Rh^– individuals
(C) AB blood group individuals (D) O blood group individuals

47. The ‘soft spot’ on the top of an infant’s skull is called—
(A) Suture (B) Fontanel
(C) Ligament (D) Fascia

48. Concentration of carbonic acid does not increase in blood due to the presence of—
(A) Na⁺ (B) K⁺
(C) Ca⁺⁺ (D) Mg⁺⁺

49. Staph food poisoning is related with—
(A) Salmonella bacteria (B) Clostridium bacteria
(C) Staphylococcus bacteria (D) None of these

50. Capacitation is—
(A) Final stage in maturation of spermatozoa (B) Final stage in fertilization
(C) Maturation of ovum (D) All of these

Answers with Hints
1. (B) Bruch’s membrane is a glassy membrane of the uvea of eye lying between the choroids membrane and the pigmented epithelium of the retina. It is also known as lamina basalis of the choroid or vitreous lamella.
2. (B) Medulla contains ascending sensory and descending motor nerves, and contains site where major motor nerves cross to opposite side of nervous system, allowing one side of brain to control opposite side of body.
3. (A) Fetuin is a type of globulin found in foetus and is required for the cell proliferation
and growth of foetus. 
4. (B) Hensen’s body is modified Golgi net found in the hair cells of the Organ of Corti.
5. (A) Ruffini’s corpuscles are encapsulated sensory nerve endings found in subcutaneous
tissue of finger tips and thought to mediate sense of warmth.
6. (D) Arginine is crystalline basic amino acid obtained from decomposition of vegetable
tissues, protamines and proteins. 
7. (A)
8. (A) Negri bodies are very minute bodies formed in nerve cells of the brain of one affected by rabies.
9. (B) Schultze’s bundle is commashaped path of fibres in middle of spinal cord’s fasciculus cuneatus.
10. (A) Schlemm’s canal is space or series of spaces at the junction of the sclera and the cornea of the eye into which aqueous humor is drained from the anterior chamber through
the pectinate villi.
11. (A) Capsule of Tenon is a thin fibrous sac enveloping the eyeball, forming a socket in
which it rotates.
12. (C) 13. (B)
14. (B) Carboniferous was the recent period of the Palaeozoic, some 355–280 million years ago. It was characterized by the evolution amphibians on swampy land, a few primitive early reptiles and giant ferns.
15. (D)
16. (B) Involution is rolling over of cells during gastrulation from the surface towards interior of the developing gastrula.
17. (D) Heart’s wall possesses three layers, i.e., the outer epicardium (serous layer), the middle myocardium (cardiac muscle), and the inner endocardium. Endocardium lines the four chambers of the heart and covers the valves. 
18. (C) Carriers of genetic disorders (those heterozygous for the condition, but who do not themselves exhibit it) can be diagnosed through screening procedures during genetic
counselling.
19. (D) The epithelial cells of the intestinal mucose manufacture and secrete peptidase and disaccharidase digestive enzymes. They are not released into the lumen of the intestine but remain closely associated with the microvilli of the epithelial cells.
20. (D) The glucose and galactose enter intestinal mucosa by active transport, while fructose enters by facilitated diffusion.
21. (D) The liver stores glycogen to fulfil body’s requirement of glucose for energy during starvation.
22. (B)
23. (B) Changes occurring to molecules of globular proteins and nucleic acid in solution in response to extremes of pH or temperature is called denaturation.
24. (A) Allometry is the study of relationship between size and shape. Organisms do not grow isometrically, rather proportions change as size changes.
25. (C)
26. (A) Hürthle cell is benign or malignant tumour of the thyroid gland. The cells are large and acidophilic.
27. (C) Sarcomas are cancer of connective tissues. Fibroblast is the characteristic cell type of vertebrate connective tissue.
28. (A) Syngraft is also known as isograft. It is a kind of grafting between isogenic individuals such as identical twins.
29. (D) Point mutations involve minor changes in the genetic material, often single base-pair substitution. Sickle-cell anaemia is genetically determined disorder, caused by homozygosity, producing a single amino acid substitution in the b-chain of the normal haemoglobin molecule. 
30. (A) Industrial melanism provides one of the best examples of evolution within species and of natural selection.
31. (C) Dopamine is a neurotransmitter whose low concentration produces symptoms of Parkinson’s disease and over production causes Schizophrenia.
32. (B) Lactic acid is a carboxylic acid, formed in metabolism of many bacteria. In milk, lactose is converted into lactic acid by metabolic activities of bacteria. Lactic acid
gives sour taste to milk. 
33. (C) Red tide is reddish discolouration of coastal surface waters due to concentrations of certain toxin producing dinoflagellates.
34. (B) Anaphylaxis is a type of hypersensitivity resulting due to interaction of humoral antibodies with mast cells and basophils.
35. (B) 36. (D)
37. (D) Mutations which are large and conspicuous are called macromutations and those very inconspicuous are called micromutation. Change in the genic frequency is the constituent of microevolution.
38. (D) Estrus is the cyclic period of sexual activity in non human female mammals, characterized by congestion of and secretion by the uterine mucosa. During estrus the animal is said to be ‘in heat’.
39. (D) 40. (B)
41. (B) Cholinergic fibres include all preganglionic fibres, all postganglionic parasympathetic fibres, which liberate acetylcholine at their nerve endings.
42. (C)
43. (C) A pair of small rounded bodies, the mammillary bodies lie behind the infundi-bulum in Diencephalon.
44. (A) Argentaffinoma is tumour, having argentaffin cells.
45. (C) 46. (A)
47. (B) In a newborn infant, the bones of the skull are still developing and these are relatively wide spaces between them. The spaces contain tough sheets of connective tissue that connect the bones and are called fontanels.
48. (A)
49. (C) Staph food poisoning, once known as ptomaine poisoning, results from toxins produced by Staphylococcus bacteria growing on food.
50. (A) Capacitation is the final stage in maturation of mammalian spermatozoa, without
which they cannot engage in fertilization.

Zoology Model Question Paper

Zoology Model Question Paper - Zoology Objective Questions

1. T8 cells are related with—
(A) Helper T cells (B) Cytotoxic T cells
(C) Suppressor T cell (D) None of the above

2. In humans, which brain wave pattern disappears entirely during sleep ?
(A) Alpha waves (B) Beta waves
(C) Theta waves (D) Delta waves

3. Which of the following is lymphatic system related disease ?
(A) Hodgkin’s disease (B) Multiple myeloma
(C) Chronic lymphocytic leukaemia (D) All the above

4. Hodgkin’s disease is associated with—
(A) Lymphocytes (B) Leucocytes
(C) Erythrocytes (D) All the above

5. In humans, which side of cerebral hemisphere recognises the faces of friends and family members ?
(A) Left cerebral hemisphere (B) Right cerebral hemisphere
(C) Both (A) and (B) (D) None of the above

6. Honey that has a high concentration of sugar, does not decay because—
(A) It contains natural antioxidant that prevent bacterial attack
(B) Bacteria cannot survive in an active state in a solution of high osmotic strength, as water is drawn out from honey
(C) In honey bacteria are totally deprived of oxygen
(D) None of the above

7. Prosoma in scorpion comprises—
(A) Head (B) Head and thorax
(C) Head, thorax and abdomen (D) Only abdomen

8. What causes Pituitary Nanism ?
(A) Hyposecretion of Adrenocorticotrophic hormone
(B) Hypersecretion of Adrenocorticotrophic hormone
(C) Hyposecretion of Somatotrophic hormone
(D) Hypersecretion of Somatotrophic hormome

9. Which of the following is ironstoring protein ?
(A) Alpha glubulin (B) Gamma glubulin
(C) Ferritin (D) Albumins

10. Red tide is caused by—
(A) Protozoans (B) Corals
(C) Dinoflagellates (D) All the above

11. The major constituent of vertebrate bone is—
(A) Calcium phosphate (B) Calcium carbonate
(C) Sodium chloride (D) Potassium hydroxide

12. Find the odd one out—
(A) Guineaworm (B) Hookworm
(C) Ringworm (D) Tapeworm

13. Taste buds located on tongue, are example of—
(A) Interoreceptors (B) Exteroreceptors
(C) Teloreceptors (D) Phonoreceptors

14. Body cells infected with virus produce a protein called—
(A) Interferon (B) Properdin
(C) Gamma globulin (D) Hybridoma

15. Capacitation of sperm in mammals involves—
(A) Sperm size change (B) Acrosome reaction
(C) Nuclear chromatin change (D) Mitochondrial alignment

16. Marfan syndrome is inherited as an autosomal dominant abnormality of—
(A) Eyes (B) Cardiovascular system
(C) Skeletal system (D) All the above

17. The cytoplasmic segment of striated muscle fibre is termed—
(A) Metamere (B) Neuromere
(C) Sarcoplasm (D) Sarcomere

18. Which one of the following is pandemic disease ?
(A) Amoebic dysentery (B) Hepatitis
(C) Filariasis (D) Influenza

19. Corpus striatum is found in—
(A) Paracoel (B) Diocoel
(C) Metacoel (D) Cerebral hemisphere

20. The polio virus enters the body through—
(A) Mosquito bites (B) Tick bites
(C) Contaminated food and water (D) Saliva and secretion from the nose

21. Products of adenine and guanine metabolism are excreted by humans as—
(A) Ammonia (B) Urea
(C) Uric acid (D) Allantoin

22. The rate and force of the heartbeat, the secretion of digestive glands are controlled by the—
(A) Central nervous system (B) Spinal nerves
(C) Cranial nerves (D) Autonomic nervous system

23. The extra embryonic membranes of mammalian embryo are derived from—
(A) Inner cell mass (B) Trophoblast
(C) Formative cells (D) Follicle cells

24. People who live at high altitudes have rosy cheeks because—
(A) Haemoglobin has an increased binding affinity for oxygen
(B) RBCs and haemoglobin concentration becomes considerably above the average in response to lowered oxygen pressure
(C) Rate of capillary circulation increases in the skin
(D) All the above

25. Which of the following animal belongs to phylum Mollusca ?
(A) Globe fish (B) Star fish
(C) Silver fish (D) Cuttle fish

26. Milk teeth in a child of 3-4 years do not include—
(A) Incisors (B) Canines
(C) Molars (D) Premolars

27. Which of the following is the only poisonous lizard of the world ?
(A) Ophiosaurus (B) Varanus
(C) Heloderma (D) Draco

28. Wharton’s duct in man is related to—
(A) Male genital organs (B) Brunner’s gland
(C) Submandibular salivary gland (D) All the above

29. The secretions from which of the following glands form ootheca in cockroach ?
(A) Colleterial glands (B) Mushroom glands
(C) Phallic glands (D) Spermatheca

30. Sensory cells that occur in the pits or canals of lateral line system of fishes are—
(A) Neurochrome (B) Neuroglia
(C) Neuromast (D) None of the above

31. The thickening of wall of artery is called—
(A) Aneurysm (B) Arteriosclerosis
(C) Arthritis (D) Both (A) and (C)

32. Lining of human intestine is—
(A) Ciliated (B) Keratinized
(C) Brush border (D) All the above

33. Which blood group has both 'a' and 'b' antibodies ?
(A) O (B) AB
(C) A (D) B

34. Glycosidic bond is broken during digestion of—
(A) Protein (B) Starch
(C) Lipid (D) All of these

35. Passive food ingestion in Amoeba is known as—
(A) Invagination (B) Import
(C) Circumfluence (D) Circumvallation

36. In gout patients, high level of one of the following is found in blood—
(A) Urea (B) Uric acid
(C) Cholesterol (D) All the above

37. The anion present in pancreatic juice is—
(A) Chloride (B) Bromide
(C) Phosphate (D) Bicarbonate

38. Preganglionic sympathetic fibres are—
(A) Adrenergic (B) Cholinergic
(C) Both (A) and (B) (D) None of these

39. The muscles associated with the heart of insects are—
(A) Radial (B) Alary
(C) Striped (D) Pericardial

40. The goblet cells present in the intestinal lining are—
(A) Holocrine (B) Merocrine
(C) Apocrine (D) Endocrine

41. Chaga’s disease is caused by—
(A) Trypanosoma gambiense (B) Trypanosoma cruzi
(C) Trypanosoma bruci (D) None of the above

42. A chemical process common in the digestion of all kinds of food is—
(A) Condensation (B) Hydrolysis
(C) Phosphorylation (D) Emulsification

43. The muscles present on the posterior aspect of thigh that flex the leg and adduct and extend the thigh in human are—
(A) Semitendinosus (B) Semimembranosus
(C) Biceps femoris (D) All the above

44. The P-wave of the electrocardiogram is associated with—
(A) Contraction of atria (B) Depolarization of atrial muscular tissues
(C) Contraction of ventricles (D) Repolarization of S–A node

45. Septicemia is—
(A) Food poisoning (B) Blood poisoning
(C) Mental disorder (D) None of the above

46. Which of the following stops the action of acetylcholine ?
(A) Acetylcholinesterase (B) Acetylcoenzyme-A
(C) Acetylcysteine (D) Acetyltransferase

47. In mammalian heart, the pulmonary is powered by—
(A) Right atrium and right ventricle (B) Left atrium and right ventricle
(C) Only right ventricle (D) Only left ventricle

48. Dartos tunic muscle fibres occur in—
(A) Uterine wall (B) Urethral wall
(C) Abdominal wall (D) Scrotal wall

49. Which of these muscles help urinary bladder to expel urine forcefully ?
(A) Detrusor muscle (B) Latissimus dorsi
(C) Hamstring muscle (D) None of the above

50. During embryonic development in humans, morula is enclosed by—
(A) Corona radiata (B) Zona pellucida
(C) Both (A) and (B) (D) None of the above

Answers with Hints
1. (B) When a T cell with a CD8 protein on its surface encounters a MHC protein with a nonself antigen, the CD8 cell is activated to produce a clone of cells called cytotoxic T cells, which are also called T8 or killer cells.
2. (A) There are four characteristic brain wave patterns. Alpha waves are recorded from calm, resting conditions. It disappears entirely during sleep.
3. (D)
4. (A) Hodgkin’s disease is malignancy of lymphocyte tissue, characterized by masses of abnormal lymphocytes.
5. (B) Visual patterns, the shapes of objects and their locations in space are interpreted by right side of the brain. With the right hemisphere humans appreciate the context of an event and recognise the faces of friends and family members.
6. (B) 7. (B)
8. (C) Pituitary Nanism is another term for dwarfism or ateliosis and is due to hyposecretion of somatotrophic hormone.
9. (C) Ferritin is iron storing protein, especially in spleen, liver and bone marrow. The iron is made available when required for haemoglobin synthesis, being transferred by transferrin.
10. (C) Red tide is reddish discolouration of costal surface waters due to concentrations of certain toxin-producing dinoflagellates.
11. (A) Bone is a hard connective tissue that makes up most of the skeleton of vertebrates. The matrix is 30% protein (collagen) and 70% inorganic matter, mainly calcium phosphate.
12. (C) Guineaworm, Hookworm and Tapeworm are endoparasite, while ringworm is a skin disease caused by fungus.
13. (B)
14. (A) Interferons are proteins produced by viral infected body cells and some lymphocytes, often in response to presence of doublestranded RNA in the cell.
15. (B) Capacitation is final stage in maturation of mammalian spermatozoa, without which they cannot engage in fertilization. Substances secreted by the ovary or by the uterine lining, must be encountered for the sperm to undergo the acrosome reaction.
16. (D) Marfan syndrome is autosomal dominant abnormalities of the eyes, cardiovascular system and the skeletal system. Most persons suffering from the disease have myopia, elongated eyeballs, long and narrow extremities (spider fingers) and irregular body proportions.
17. (C) The protoplasm of the fibres of striated muscle, excluding the myofibrils, is called sarcoplasm.
18. (D)
19. (D) Corpus striatum is a structure in the cerebral hemispheres consisting of two basal ganglia (the caudate and lentiform nuclei) and the fibres of the internal capsule that separate them.
20. (C)
21. (C) As a result of nucleic acid digestion, nitrogenous organic acid bases–purines (adenine and guanine) and pyrimidines (cytocine, thymine and uracil) are absorbed from intestine into the blood. In humans, purines are changed into uric acid for excretion.
22. (D) Autonomic nervous system supplies motor nerves to the smooth muscles of the gut and internal organs and to heart muscle. It comprises the sympathetic nervous system, which when stimulated increases heart rate, breathing rate and blood pressure and slows down digestive processes, and the parasympathetic nervous system slows heart rate and promotes digestion.
23. (B) Trophoblast is epithelium, surrounding the mammalian blastocyst, forming outer layer and becoming part of extra embryonic membranes.
24. (B) At high altitudes, the composition of air remains the same as at sea level but the density of air gradually decreases. Therefore, people living at high attitudes are acclimatized to high altitude conditions due to a significant increase in RBC count and haemoglobin content in blood.
25. (D)
26. (C) In humans all teeth, except adult molars, grow twice in life. There are 20 milk teeth in child, that does not include 12 molar teeth.
27. (C) Heloderma is the only poisonous lizard of the world and commonly called gila monster.
28. (C) Wharton’s duct is the duct of the submandibular salivary gland, opening into the mouth at the side of the frenum linguae.
29. (A) The left collecterial gland secretes a soluble milky protein, while the right one secretes watery dihydroxyphenol. Both secretions combine to form a scleroprotein which forms a common egg-case, celled ootheca.
30. (C) Neuromast is one of numerous groups of sensory cells that occur in pits or canals along the lateral line system in fishes.
31. (B) Arteriosclerosis is the disease of arteries in which the wall of arteries become thickened and rigid, and blood flow is hindered.
32. (C) Brush border is the outer surface of columnar epithelial cells living the human intestine.
33. (A) Humans having ‘O’ group blood, have no blood group antigens, but possess both ‘a’ and ‘b’ antibodies.
34. (B)
35. (B) Import is the method which involves taking of food on contact of food. The food passively sinks into the body of Amoeba by rupturing the plasmalemma and ectoplasm at the point of contact.
36. (B) 37. (D)
38. (B) Preganglionic sympathetic fibres are cholinergic and release acetylcholine from its ending when stimulated.
39. (B)
40. (B) Goblets cells are merocrine (epicrine) in nature.
41. (B) 42. (B)
43. (D) Hamstrings are three muscles on the posterior aspect of the thigh, semitendinosus, semimembranous and bicep femoris. They flex the leg, adduct and extend thigh.
44. (B) Electrocardiogram is a record of the electrical activity of the heart, shows certain waves called P, Q, R, S, and T waves. The Pwave is caused by the depolarization of the atrial muscle tissues.
45. (B) Blood poisoning is a common name for an infection of the blood that is also called septicemia or toxemia.
46. (A) Acetylcholinesterase is an enzyme that stops the action of acetylcholine. It is present in various body tissues.
47. (A)
48. (D) Dartos tunic is the muscular contractile tissue beneath the skin of the scrotum.
49. (A) The bladder wall contains three layers of smooth muscle, which together are called the detrusor muscle. Contraction of the detrusor muscle help expel urine forcefully from the bladder.
50. (B) The morula reaches uterus about 4 to 6 days after fertilization. It is still surrounded by the zona pellucida, that prevents its sticking to the uterine wall.

Zoology Objective Questions

Zoology Objective Questions for IAS Practice

1. Heparin is secreted by—
(A) Fibroblasts (B) Mast cells
(C) Plasmocytes (D) Adipocytes

2. Interdependent genes with related functions, form—
(A) A coadapted gene complex (B) An inversion
(C) A fitness set (D) A super mutation

3. Which of the following animal has rhabditiform larva in its life cycle ?
(A) Ascaris (B) Liverfluke
(C) Hydra (D) Taenia

4. Which of the following Mollusc is cultured in water for producing pearls in India ?
(A) Pinctada (B) Heliotis
(C) Anodonta (D) Mytilus

5. Enzymes promote chemical reaction by—
(A) Reducing the activation energies
(B) Causing the release of heat which acts as a primer
(C) Increasing molecular motion
(D) Changing the free energy difference between substrate and product

6. The modification of hind pair of wings into halteres is the characteristic of—
(A) Lepidoptera (B) Orthoptera
(C) Hemiptera (D) Diptera

7. A molecule of ATP is structurally similar to a molecule of—
(A) RNA molecule (B) DNA molecule
(C) Amino acid (D) Fatty acid

8. Class Trematoda belongs to the phylum—
(A) Platyhelminthes (B) Arthropoda
(C) Mollusca (D) Annelida

9. Albinism is caused due to lack of production of—
(A) Tyrosine 3-monooxygenase (B) Homogentisic acid oxidase
(C) Thiamine pyrophosphate (D) Phenylalanine hydroxylase

10. Maximum power of division is found in the skin layer—
(A) Stratum granulosum (B) Stratum malpighi
(C) Stratum spinosum (D) Stratum corneum

11. Tube feet are characteristic of—
(A) Star fish (B) Cuttle fish
(C) Cray fish (D) Jelly fish

12. Which of the following is egg laying mammal ?
(A) Pangolin (B) Porcupine
(C) Tachyglossus (D) Bat

13. Acetylcholine is responsible for transmission of nerve impulses through—
(A) Dendrites (B) Axons
(C) Cytons (D) Synapses

14. Loss of ability to speak due to defect of vocal organs, is called—
(A) Alalia (B) Alaorina
(C) Alate (D) Albidus

15. Termination of amino acid chain requires codons—
(A) UAG, UAA, UGA (B) UUU, GGU, UGG
(C) GUG, UGG, AUG (D) UGG, GGG, AUG

16. ‘A tube within a tube’ body plan is met within—
(A) Hydra (B) Plannaria
(C) Ascaris (D) Fasciola

17. The parts of neurons that perform basic cellular functions, such as protein synthesis, are the—
(A) Somas (B) Axons
(C) Dendrites (D) Synaptic knobs

18. Lewy bodies are found in—
(A) Brain (B) Plasma
(C) Lymph (D) Kidneys

19. A hormone that stimulates the secretion of pancreatic secretions to neutralize the acid chyme from the stomach, is—
(A) Insulin (B) Secretin
(C) Oxytocin (D) Glucagon

20. Which of the following pair is correctly matched ?
(A) Excessive perspiration—Xeric adaptation
(B) Parasitism—Interspecific relationship
(C) Uricotelism—Aquatic habitat
(D) Streamline body—Aquatic adaptation

21. Cross bridges, which connect the molecules of a fibril during muscle contraction, are made of—
(A) Actin (B) Collagen
(C) Myosin (D) Creatine phosphate

22. Muscles of alimentary canal are chiefly—
(A) Striated and neurogenic (B) Unstriated and neurogenic
(C) Striated and myogenic (D) Unstriated and myogenic

23. The photosensitive parts of rod cells are made up of—
(A) Rhodopsin (B) Myelin
(C) Keratin (D) Actin

24. The protein which maintains the muscular storage of oxygen is—
(A) Myosin (B) Myoglobin
(C) Actomyosin (D) All the above

25. Tiedemann’s bodies are found in—
(A) Sponges (B) Hydra
(C) Asterias (D) Hirudinaria

26. In a normal person at rest the cardiac output or amount of blood pumped per minute by the left ventricle is approximately—
(A) 1/2 litre (B) 1 litre
(C) 2 litres (D) 5 litres

27. Biogeographical regions are also called—
(A) Zones (B) Realms
(C) Epoch (D) Era

28. Human nerve cells develop from the embryonic—
(A) Ectoderm and mesoderm (B) Endoderm
(C) Ectoderm (D) Mesoderm

29. Vertebrate kidney has a following basic unit—
(A) Nephron (B) Ureter
(C) Malpighian tubule (D) All of the above

30. In cladistics—
(A) A clad must contain the common ancestor
(B) Derived characters help construct cladograms
(C) Data for the cladogram is presented
(D) All the above

31. Which of the following organ develops first ?
(A) Liver (B) Heart
(C) Notochord (D) Kidneys

32. The infective stage of malarial parasite is—
(A) Metacryptozoite (B) Cryptozoite
(C) Schizont (D) Sporozoite

33. The ion mainly absorbed in the distal convoluted part of
nephron—
(A) Na⁺ (B) K⁺
(C) Mg⁺⁺ (D) Po4^{– –}

34. Quadriceps and Gastronemius muscles are present in—
(A) Wrist (B) Hands
(C) Legs (D) Shoulder

35. FSH and LH hormones together are called—
(A) Emergency hormone (B) Gonadotropic hormone
(C) Neuro hormones (D) Outstress hormones

36. Shivering in severe cold is caused by—
(A) Voluntary action of striated muscles
(B) Voluntary action of unstriated muscles
(C) Involuntary action of striated muscles
(D) Involuntary action of unstriated muscles

37. Hypocalcemia is caused due to under secretion of—
(A) Thyroxine (B) Paratharmone
(C) Testosterone (D) Glucagon

38. The emergency hormone in humans is—
(A) Thyroxine (B) Adrenaline
(C) Insulin (D) Progesterone

39. Polio immunising vaccine was developed by—
(A) E. Jenner (B) Dr. Salk
(C) St. Hale (D) Landsteiner

40. In mammals which organ acts as blood bank ?
(A) Heart (B) Lung
(C) Liver (D) Spleen

41. Structure involved in Addison’s disease is—
(A) Adrenal cortex (B) Adrenal medulla
(C) Pituitary (D) Thyroid

42. Biceps and Triceps surround—
(A) Radius (B) Ulna
(C) Humerus (D) Femur

43. Chemical nature of insulin is—
(A) Steroid (B) Lipid
(C) Protein (D) Carbohdyrate

44. Which of these is present in human buccal cavity ?
(A) Ptyalin (B) Trypsin
(C) Lipase (D) Pepsin

45. Outermost covering of brain is—
(A) Choroid (B) Arachnoid
(C) Duramater (D) All of these

46. The application of genetic principles for the improvement of mankind is—
(A) Genetic engineering (B) Biotechnology
(C) Eugenics (D) Anthropology

47. Cockroach and other insects possess an—
(A) Open type vascular system (B) Closed type vascular system
(C) No vascular system (D) Both (A) and (B)

48. Ganglioside is found in—
(A) Nerve (B) Smooth muscles
(C) Carolia muscles (D) Liver cells

49. ‘Metachrosis’ is found in—
(A) Mammals (B) Amphibians
(C) Birds (D) All of these

50. Healthy parents with normal height gave birth to a achondroplasia (dwarf) child. This is due to—
(A) Spontaneous mutation (B) Point mutation
(C) Induced mutation (D) None of these

Answers with Hints1. (B) Mast cells secrete heparin, a proteoglycan, which is an anticoagulant.
2. (A)
3. (A) After gastrulation, a juvenile is formed in Ascaris. It is 0•2 mm long and having close with Rhabditis, a nematode found in the soil and human faeces. The rhabditoid larva of the first stage is not infective.
4. (A) 5. (A) 6. (D) 7. (A) 8. (A)
9. (A) The persons with recessive aa genes do not produce the tyrosine 3-monooxygenase which is needed by melanocytes for converting DOPA (3, 4-dihydroxyphenylalanine) into melanin (a dark brown pigment).
10. (B) 11. (A) 12. (C) 13. (D)14. (A)
15. (A) 16. (C) 17. (A)
18. (A) Lewy bodies are neuronal cells with pigmented inclusion bodies. They are found in brain in the substantia nigra and locus ceruleus.
19. (B) 20. (D) 21. (C)
22. (B) Muscles of alimentary canal are smooth unstriated and are innervated by fibres of ANS. These muscles are neurogenic.
23. (A) The photosensitive part of rod and cone cells are their outer segments. In rods, this part contains a shining pigment called rhodopsin or visual purple. Like haemoglobin, rhodopsin is a compound of a protein (= opsin or scotopsin) and a pigment (retinene).
24. (B)
25. (C) Tiedemann’s bodies are small rounded, yellowish glandular sacs opening into the ring canal on its inner side. There is one Tiedemann’s body between each radius and inner radius except in one such position where the stone canals enters the ring canal.
26. (D) 27. (B) 28. (C) 29. (A)
30. (D) The cladistic school analyses primitive and derived characters and construct cladograms on the basis of shared derived characters. A clad is a common ancestor and all the species derived from that common ancestor. Cladograms are diagrams based on objective data.
31. (C) 32. (D) 33. (A) 34. (C) 35. (B)
36. (C) Shivering is due to increased involuntary striated muscle activity in response to excessive cold.
37. (B) When there is undersecretion of paratharmone, the level of calcium in ECF falls (hypocalcemia), and that of phosphate rises. Such a condition is responsible for neuromuscular hyperexcitability.
38. (B) 39. (B) 40. (D) 41. (A) 42. (C)
43. (C) 44. (A) 45. (C) 46. (C) 47. (A)
48. (A) 49. (B)
50. (A) The child’s achondroplasia arose from de novo mutation in either his mother’s or father’s gamete. Such a spontaneous mutation usually originates as a DNA replication error.