RAS Sample Paper - Zoology

RAS Pre Sample Paper for Zoology Subject: 
1. Among the following foods, which is the most appropriate for a desert mammal for the regulation of its water balance ?
(a) Carbohydrate-rich cereals
(b) Oil-rich seeds
(c) Protein-rich pulses
(d) Both carbohydrate and protein-rich foods
2. Consider the following components used in electron transport system that act in a sequential manner:
1. NAD
2. Cytochrome-c
3. Cytochrome-a
4. FAD
What is the correct sequence of the above?
(a) 1—4—2—3
(b) 3-4—2—1
(c)1—2–4—3
(d) 2—1-3-4
3. A person observing prolonged fast will excrete, which one of the following in urine?
(a) Fat
(b) Amino acids
(c) Albumin
(d) Ketone bodies

4. Consider the following statements; in citric acid cycle1. three hydride ions (hence, six electrons) are transferred to three NAD+ molecules
2. one pair of hydrogen atoms (hence, two electrons) is transferred to one NADP +molecule
3. one pair of hydrogen atoms (hence, two electrons) is transferred to one FAD molecule
4. one NADH molecule is utilized in the process
Which of the statements given above are correct?
(a)1 and 2
(b)1 and 3
(c)1 and 4
(d)2 and 4

5. Hypersecretion of glucocorticoids especially cortisol and cortisone causes
(a) Addison’s disease
(b) adrenogenital syndrome
(c) Cushing’s syndrome
(d) testicular feminization

6.Kidney is involved in the synthesis of
(a) calbindin for calcium absorption
(b) calcitriol for calcium homeostasis
(c) cholecalciferol for bone formation
(d) calcitonin for phosphorus metabolism

7. Which one of the following is correct in ion exchange during
impulse conduction?
(a) Sodium pump stops working
(b) 3 Na+ are pumped in and 2K + pumped out
(c) 3 Na+ are pumped out for every 2K+ pumped in
(d) 1Na+ replaces 1 K+

8. What is the difference between substrate level phosphorylation and oxidative phosphorylation?
(a) Energy released by flow, electrons is utilized in oxidative phosphorylation for the synthesis of ATP but not in
substrate level phosphorylation
(b) ATPs are produced by oxidative phosphorylation but not by substrate level phosphorylation
(c) Substrate level phosphorylation occurs only under non-aerobic condition but not oxidative phosphorylation
(d) Oxidative phosphorylation requires more energy for synthesis of ATP than substrate level phosphorylation

9. During transmission of nerve impulse, the membrane potential inside the cell is
(a) first negative, then positive and back negative
(b) first negative, then positive and remains positive
(c) first positive, then negative and remains negative
(d) first positive, then negative and back positive

10.During phosphogluconate pathway (HMP shunt), the monosaccharides formed along with CO2 are
(a) hexoses
(b) trioses
(c) tetroses
(d) pentoses

11.Long-chain fatty acids penetrate the inner mitochondrial membrane as derivatives of which one of the following?
(a) Carnitine
(b) Coenzyme-A
(c) Sialic acid
(d) Sphingosine

12. Consider the following statements:
Fibrinogen, the precursor of fibrin
1. consists of only primary structure
2. resembles fibrous proteins structurally
3. behaves like globular proteins in their solubility in aqueous
salt solutions
Which of the statements given above are correct?
(a)1 and 2 only
(b)2 and 3 only
(c)1 and 3 only
(d)1,2 and 3

13. Who among the following proposed the alpha-helix structure of proteins?
(a) Crick and Watson
(b) Pauling and Corey
(c) Nirenberg and Khorana
(d) Skoog and Miller

14.Maltose is formed by which glycosidic linkage?
(a) Glucose alpha 1—4 glucose
(b) Galactose alpha 1—4 glucose
(c) Glucose ?eta 1-4 galactose
(d) Glucose ?eta 1—4 glucose

15. Consider the following:
1. Succinate dehydrogenase
2. NADH dehydrogenase
3. Cytochrome oxidase
4. Cytochrome-bc1 complex
What is the correct sequence of the above in the electron
transport chain?
(a) 2—4—1—3
(b) 2—1–4—-3
(c) 3-4—4—2
(d) 3—4—1—2

16. An allosteric inhibitor of enzyme action acts by combining with
(a) the catalytic site of the enzyme
(b) the non-catalytic site of the enzyme
(c) the substrate
(d) Both the substrate and the non-catalytic site of the enzyme

17. Which among the following are the enzymes leading to substrate level phosphorylation during glycolysis?
(a) Pyruvate kinase and enolase
(b) Pyruvate kinase and phosphoglycerokinase
(c) Triose phosphate dehydrogenase and phosphoglycerokinase
(d) Phosphoglycerokinase and phosphofructokinase

18 . The glands found on the edges of eyelids and help to keep the come surface moist are called
(a) ceruminous glands
(b) Zeis glands
(c) sudorific glands
(d) Meibomian glands

19. Consider the following:
1. Diarrhoea
2. Dementia
3. Dermatitis
4. Delinquency
Pellagra is characterized by which of the above?
(a) 1,2and4
(b)1,2and3
(c)2,3and4
(d)1,3and4

20 Which one of the following statement is not correct about metamorphosis in frog?
(a) The forelimbs, which develop under cover of the opercular membrane, break through to the exterior
(b) The middle ear develops in connection with the third pharyngeal pouch
(c) The eyes protrude on the dorsal surface of the head and develop eyelids
(d) The tongue is developed from the floor of the mouth

21. Which of the following changes are involved in retrogressive metamorphosis in ascidians?
1. Increase in the number of pharyngeal stigmata.
2. Complete disappearance of tail.
3. Disappearance of the endostyle and other parts of feeding mechanism.
4. Disappearance of the eye and the otocyst.
Select the correct answer using the codes given below:
Codes:
(a)2 and 4 only
(b) 1 and3
(c)1,2and4
(d)2,3and4

22. Consider the following developmental stages of frog:
1.Neurula
2.Blastula
3.Morula
4. Gastrula
Which of the above lack a blastopore?
(a) 1 and4
(b) 2 and 3 only
(c) 1,2 and 3
(d)2,3 and 4

23. Consider the following statements:
The upper layer of the area opaca in the blastoderm of the chick gives rise to
1.ectoderm
2. mesoderm
3. extra-embryonic endoderm
Which of the statements given above is/are correct?
(a)1 and 2 only
(b) 1 and 3 only
(c) 3 only
(d)1,2 and 3

24. Consider the following statements on extra-embryoniic membranes in chick:
1. Allantois has inner layer of endoderm and outer layer of splanchnic mesoderm
2. Yolk sac has an inner layer of endoderm and outer layer of splanchnic mesoderm.
3. Allantois has inner layer of splanchnic mesoderm and outer layer of endoderm.
4. Yolk sac has inner layer of splanchnic mesod6rm and outer layer of endoderm.
Which of the statements given above are correct?
(a)1 and 2
(b)2 and 3
(c)3 and 4
(d)1 and 4

25. Consider the following statements:
1: By examining embryos and foetal stages of a vertebrate group, it is impossible to identify the group to which they belong.
2. Structural similarities exist in embryonic and larval stages, which are not apparent in adults.
3. During the development, chick first resembles a fish, then an amphibian and later a reptile.
Which of the statements given above is/are correct?
(a) 1 and 2 only
(b) 1 only
(c) 2 and 3 only
(d)1,2 and 3

26. What is common in the scientific contributions of scientists, viz, Francesco Redi, Lazzaro Spallanzani and Louis Pasteur?
(a) Their studies have conclusively proved that higher forms of organisms have not evolved from viruses
(b) They have provided experimental evidences disproving the theory of spontaneous generation of organisms
(e) They have shown that viruses exhibit features of both living organisms and non-hying things
(d) They have shown that most bacteria are heterotrophic in their nutrition

27.The main contributions of Stephen J Gould to the evolutionary theory is the proposition that
(a) most evolutionary changes are principally the outcome of gradual accumulation of small inherited variations
(b) Mendelian mechanism cannot be an important element in directing evolutionary changes
(c) certain character show a sustained tendency to develop along an evolutionary line
(d) most evolutionary changes have consisted of rapid outbursts of speciation alternating with long periods during, which the individual species remained virtually unmodified

Which of the following groups of animals studied by Darwin in his visit to Galapagos led him to advance his theory of evolution?
(a) Flightless birds, giant iguana lizard and cave-dwelling fishes
(b) Finches, echidnas and cave-dwelling newts
(c) Giant land tortoises, armadillos and opossurns
(d) Finches, giant iguana lizard and giant land tortoises

28.Which of the following groups of animals studied by Darwin in his visit to Galapagos led him to advance his theory of evolution?
(a) Flightless birds, giant iguana lizard and cave-dwelling fishes
(b) Finches, echidnas and cave-dwelling newts
(c) Giant land tortoises, armadillos and opossums
(d) Finches, giant iguana lizard and giant land tortoises

29. Consider the following statements:
1. The Neanderthal man was thick- muscular, relatively short with a large nose and strong jaws.
2. The Neanderthal man inhabited sub-Saharan Africa about 50000 years ago.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c)Both I and 2
(d) Neither 1 nor 2

30. The ancestral horse Eohippus of Eocene period shows, which one of the following adaptations in limbs for speed?
(a) 4 digits in forelimbs and 3 digits in hind-limbs
(b) 3 digits in forelimbs and 4 digits in hind-limbs
(c) 4 digits in forelimbs and 4 digits in hind-limbs
(d) 3 digits in forelimbs and 3 digits in hind-limbs

31. Which one of the following is not a fossorial adaptation?
(a) T—shaped episternum
(b) Fusion of cervical, sacral and lumbar vertebrae
(c) Keeled sternum
(d) Highly developed tactile sense

32. ‘Project Musk Deer’ was launched in 1974 in ?
(a) Dachigam national park
(b) Kedarnath national park
(c) Corbett national park
(d) Pine valley national park

33. The Gangetic dolphin belongs to the genus
(a) Platanista
(b) Pelphinus
(c) Balaenoptera
(d) Phocaena

34 Consider the following-statements:
1. The Pygmy Hog (Sus salvanius), the smallest wild pig, is an inhabitant of eastern Himalayan foothills.
2. The Mouse Deer (Tragulus meminna), a tiny ruminant, inhabits the forested areas of southern India.
Which of the statements given above is/are correct?
(a)1 only
(b)2 only
(c)Both I and 2
(d) Neither I nor 2

35. The Eravikulam national park is famous for its
(a) Gaur
(b) Lion-tailed Macaqua
(c) Nilgiri Tahr
(d) Great Indian Bustard

36. Which one of the following is the most productive aquatic ecosystem?
(a) Coral reef ecosystem
(b) Estuarine ecosystem
(c) Riverine ecosystem
(d) Pond ecosystem

37.Consider the following marine organisms:
1.Ammodytes
2.Calanus
3. Clupea
4. Chaetoceros
Which one of the following is the correct sequence of the food chain formed by these organisms beginning with the producer?
(a) 2—4—1—3
(b) 4—2—3—1
(c) 4—2—1—3
(d)1 –4—3—2

38. A genetically different population of a species colonizing different habitats is known as
(a) ecophene
(b) ecotype
(c) ecological equivalent
(d) ecad

39.Which one of the following is found in eastern Himalayan sub-region?
(a) Brown goral
(b) Markhor
(c) Ibex
(d) Tahr

40. In warm-humid climate many mammals, birds and insects are darkly coloured than their counterparts living in cool-dry climate. This is an example of
(a) Jordan’s rule
(b) Gloger’s rule
(c) Bergmann’s rule
(d) Allen’s rule

41. Indian wild ass comes under, which Schedule of Indian Wild Life (Protection) Act, 1972?
(a) I
(b)II
(c) III
(d) IV

42.Which one of the following kinds of substances contribute significantly in increasing the phosphate concentration during eutrophication?
(a) Detergents
(b) Disinfectants
(c) Organochlorines
(d) Synthetic polymers

43.Methaemoglobinemia is caused due to the presence of in excess of which of the following in Drinking water?
(a) Iron
(b) Nitrate
(e) Phosphate
(d) Copper

44. Which one among the following is the largest wetland?
(a) Pulicat lake
(b) Kaliveli tank
(c) Chilika lake
(d) Vedanthangal

45. Bombykol is a/an
(a) hormone
(b) parasite
(c) pheromone
(d) enzyme

46.Which one of the following statements is not correct?
(a) All sponges are exclusively marine
(b) Amphiblastula is a landform of certain sponges
(c) Calcareous and siliceous spicules are found in many sponges
(d) All sponges are sessile

47. With reference to coelenterates consider the following
features:
1. Polyp forms.
2. Strongly developed stomodaeum and possessing siphonoglyphs.
3. Well-developed mesoglea containing fibrous connective tissue and amoeboid cells
Which one of the following pairs of coelenterates represents the above features?
(a) Obelia and Aurelia
(b) Physalia and Vellela
(c) Polyorchis and Parpita
(d) Zooanthus and Alcyonium

48. The sting of honey bee is a modified organ of which of the following?
(a) Mandibles
(b) Labellum
(c) Ovipositor
(d) Proboscis

49. Consider the following species of prawn:
1. Penaeus indicus
2. Penaeus monodon
3. Parapenaeopsis stylifera
4. Macrobrachium rosenbergii
Which of the above is/are cultured in freshwater?
(a) 1 and 2
(b) 3 only
(c) 4 only
(d)3 and 4

50. Among the following zooplanktons, which one is not a rotifer?
(a) Brachionus
(b) Asplanchna
(c) Stenocypris
(d) Lecane

Answers Key:
1 a  2 a 3 d 4 b 5 c 6 b 7 c 8 a 9 a 10 d 11 a 12 c 13 b 14 a 15 b 16 b 17 b 18 c 19 b 20 b 21 d 22 b 23 c 24 a 25 c  26 b 27 d 28 d 29 a  30 a 31 c 32 b 33 a 34 c 35 a 36 a 37 c 38 b 39 a 40 d 41 a 42 a 43 b 44 c 45 c 46 a 47 a 48 c 49 d 50 d