NEET Biology Mock Test 3

1. Four respiratory enzymes are given below. Arrange them in increasing order of the carbon number of the substrates on which they act
I. enolase
II. aconitase
III. fumarase
IV. alcohol dehydrogenase
(a) II, IV, III, I
(b) IV, I, II, III
(c) I, IV,’III, II
(d) IV, I, III, II

2. Feedback inhibition of enzymes is affected by which of the following?
(a) Enzyme
(b) Substrate .
(c) End products
(d) Intermediate end products

3. Bone marrow is made up of
(a) muscular fibre and fatty tissue
(b) fatty tissue and areolar tissue
(c) fatty tissue and cartilage
(d) fatty tissue, areolar tissue and blood vessel

4. Disease resistance crop is obtained by
(a) crossing with new varieties
(b) crossing with wild varieties
(c) injecting with organic compounds
(d) None of the above

5. RBC and a plant cell (with thick cell wall) are placed in distilled water. The solute concentration is the same in both the cells. What changes would be observed in them?
(a) Both plant cell and RBC would not undergo any change
(b) The RBC would increase in size and burst, while the plant cell would remain about the same size
(c) The plant cell would increase in size and burst, while the RBC would remain about the same size
(d) Both plant cell and RBC would decrease in size and collapse

6. Which of the following indicates correct names of A, B, C and D regions of the given diagram?

(a) A-Male gamete B-Antipodals
C-Egg cell D-Pollen tube
(b) A-Synergids . B-Secondary nucleus
C-Egg apparatus D-Integuments
(c) A-Antipodals B-Male gametes
C-Zygote D-Micropyle
(d) A-Secondary nucleus B-Synergids
C-Egg cell D-Integuments

7. Assertion Dope test is used to estimate the level of blood alcohol by analysing the breath of persons drinking alcohol.
Reason A drunken person usually feels tense and less talkative.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

8. Match the following columns.

Codes
ABODE              ABODE
(a) 4 5 2 1 3 (b) 5 4 1 2 3
(c) 3 4 1 5 2 (d) 3 4 5 1 2

9. Damage to’thymus in a child may lead to
(a) a reduction in haemoglobin content of blood
(b) a reduction in stem cell production
(c) loss of antibody mediated immunity
(d) loss of cell mediated immunity

10. DNA fingerprinting refers to
(a) molecular analysis of profiles of DNA samples
(b) analysis of DNA samples using imprinting device
(c) techniques used for molecular analysis of different specimens of DNA
(d) Techniques used for identification of fingerprints of individuals

11. Which of the following correctly represents the types of fruits given?

(a) A-Sorosis, B-Berry, C-Caryopsis, D-Drupe, E-Aggregate
(b) A-Aggregate, B-Berry, C-Caryopsis, D-Drupe, E-Legume,
(c) A-Beccate, B-Sorosis, C-Caryopsis, D-Drupe, E-Composite
(d) A-Berry, B-Sorosis, C-Caryopsis, D-Drupe, E-Legume

12. What are homologous structures?
(a) Organs that have no function now but had an important function in ancestors
(b) Organs appearing only in embryonic stage and disappearing later in the adult
(c) Organs with anatomical similarities but,performing different functions
(d) Organs with anatomical dissimilarities but performing same functions

13. What is the amino acid sequence encoded by the base sequence:
UCA UUU UCC GGG AGU of a mRNA segment?
(a) Methionine-Phenylalanine-Serine- Glycine-Serine
(b) Glycine-Serine-Phenylalanine-Serine-Glycine
(c) Serine-Phenylalanine-Serine-Glycine-Serine
(d) Serine-Phenylalanine-Glycine-Serine-Glycine

14. Match the following columns.

15. Assertion A network of food chains existing together in an ecosystem is known as a food web.
Reason An animal like kite cannot be a part of a food web.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

16. Which of the following is the character of dorsal blood vessel of the earthworm? 
(a) Collecting in the whole body
(b) Collecting in first 13 segments .
(c) Distributing in the whole body
(d) Distributing in the first 13 segments

17. Which one of the following four secretions is correctly matched with its source, target and nature of action?
Secretion Source Target Action

18. Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for
(a) population explosion
(b) migration
(c) biodiversity loss
(d) ecological succession

19. Cork cambium gives rise to
(a) phellogen and secondary cortex
(b) phellogen, phelloderm and secondary cortex
(c) cork and phellogen
(d) cork and secondary cortex

20. Which one of the following js not true about the light
reactions of photosynthesis? .
(a) Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II
(b) The flow of electrons from water to NADP in non-cyciic electron transport produces one ATP
(c) Reactions of the two photosystems are needed for the reduction of NADP
(d) P680 and P700 are the reaction centres of PS-I and PS-IIrespectively .

21. With reference to enzymes, which one of the following statements is true.
(a) Apoenzyme = Holoenzyme + Coenzyme
(b) Holoenzyme = Apoenzyme + Coenzyme
(c) Coenzyme = Apoenzyme + Holoenzyme
(d) Holoenzyme = Coenzyme – Apoenzyme

22. Assertion Sponges have tissue level of organisation. Reason Sponges mostly have external fertilisation.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

23. Which of the following is correct for the circulatory system of cockroach?
(a) It is present on the dorsal side and it has thirteen units of heart in abdominal region
(b) It is present on the ventral side and it has two abdominal and three thoracic units of heart
(c) It is present on the ventral side and it has thirteen units of heart in abdominal region
(d) It is present on the dorsal side and it has ten abdominal and three thoracic units of heart

24. Match the following columns.

Codes
A B C D t A B
(a) 6 5 13 4 (b) 5 4 321
(c) 5 12 4 3 (d) 3 2154

25. Read the following statements and select the correct one.
(a) The H+ released from carbonic acid combines with haemoglobin to form haemoglobinic acid
(b) Oxyhaemoglobin of erythrocytes is alkaline
(c) More than 70% of carbon dioxide is transferred from tissues to the lungs in the form of carbamino compounds
(d) In a healthy person, the haemoglobin content is more than 25 gm per 100 mL

26. Assertion In humans, the gamete contributed by the male determines, whether the child produced will be male or female.
Reason Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

27. In gymnosperms, the pollen chamber represents.
(a) A cell in the pollen grain in which the sperms are formed
(b) A cavity in the ovule in which pollen grains are stored after pollination
(c) An opening in the megagametophyte through, which the pollen tube approaches the egg
(d) The microsporangium in which pollen grains develop

28. The RER in the cell synthesises protein, which would be later used in building the plasma membrane. But it is observed that the protein in the membrane is slightly different from the protein made in the RER. The protein ways probably modified in another cell organelle. Identify that organelle in the given diagram.

(a )D (b )A
(c) B (d) C

29. Assertion Escherichia coli, Shigella sp. and Salmonella species are all responsible for diarrhoeal diseases.
Reason Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids • and electrolytes should be ensured.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason%re false

30. Which one of the following is the correct matching of the events occurring during menstrual cycle?
(a) Ovulation — LH and FSH attain peak level and sharp fall in the secretion Of progesterone
(b) Proliferative phase — Rapid regeneration of myomettium and maturation of Graafian follicle
(c) Development of — Secretory phase andcorpus luteum increased secretion of progesterone
(d) Menstruation — Breakdown of myometrium and ovum not fertilised

31. Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct?
(a) the patient has been inhaling polluted air containing usually high content of carbon disulphide
(b) the patient has been inhaling polluted air containing usually high content of chloroform
(c) the patient has been inhaling, polluted air containingusually high content of carbon dioxide .
(d) the patient has been inhaling polluted air containing usually high content of carbon monoxide

32. Assertion Predation is an interspecific interaction with
a feeding strategy.
Reason Predator and their prey maintain fairly stable ‘ population through time and rarely one population become abundant or scarce.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false .

33. Match the following columns.

34. Select the correct events leading to the opening of the stomata.
I. Decline in guard cell solutes,
II. Lowering of osmotic potential of guard cells.
III. Rise in potassium levels in guard cells.
IV. Movement of water from neighbouring cells into guard cells.
V. Guard cells becoming flaccid.
(a) I and V
(b) II, III and IV
(c) I, III and IV
(d) II, IV and V

35. Assertion A cell membrane shows fluid behaviour. Reason A membrane is a mosaic or composite of diverse lipids and proteins.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion.
‘ (c) Assertion is true, but Reason is false.
(d) Both Assertion and Reason are false.

36. Cultivation of Bt cotton has been much in the news. The prefix Bt means .
(a) barium-treated cotton seeds
(b) bigger thread variety of cotton with better tensile strength
(c) produced by biotechnology using restriction enzymes and ligases
(d) carrying an endotoxin gene from Bacillus thuringiensis

37. Select the characters, which are not applicable to the family-Solanaceae.
I. Epipetalous and syngenesious anthers.
II. Bicarpellary and syncarpous ovary.
III. Oblique ovary with axile placentation.
IV. Stamen six, arranged in two whorls.
V. Bicarpellary, syncarpous and inferior ovary.
(a) II and III
(b) I, IV and V
(c) II, IV and V
(d) I and III

38. Match the following columns.

Codes
ABODE ABODE
(a) 3 4 5 1 2
(b) 5 1 3 4 2
(c) 4 5 1 2 3
(d) 1 3 4 5 2

39. Assertion Salt resistant plants survive in saline
habitats by maintaining low internal Na+ levels. Reason Salt resistant plants gdt rid of excess Na+ by ATP energised antiporter.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

40. Assertion Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason Anti Diuretic Hormone (ADH) is secreted by the posterior lobe of pituitary.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

41. Find out the correct statement.
(a) Monosomy and nullisomy are the two types of euploidy
(b) Polyploidy is more common in animals than in plants
(c) Polyploids occur due to the failure in complete separation of sets of chromosomes
(d) 2n-1 condition results in trisomy

42. Cyathium inflorescence shows
(a) scorpioid cyme showing central female, many peripheral male flowers
(b) scorpioid cyme showing central male, many peripheral female flowers
(c) dichasial cyme showing two whorls of 3-9 flowers
(d) dichasial cyme showing two whorls, one of male and another of female flowers

43. Which of the following statements are true?
I. The apoplastic movement of water occurs exclusively through the cell wall without crossing any membranes.
II. Solutes present in a cell (or in any solution) increase the free energy of water or water potential.
III. The symplastic movement occurs from cell to cell through the plasmodesmata.
IV. Membrane permeability depends on the membrane composition, as well the chemical nature of the solute.
(a) I and II
(b) II and IV
(c) I, III and IV
(d) I, II and IV

44. Which of the following four cell structures is correctly matched with the accompanying description?
(a) Plasma membrane — Outer layer of cellulose orchitin or absent.
(b) Mitochondria — Bacteria like elements withinner membrane forming sacs . containing chlorophyll, foundin plant cell and algae.
(c) Chloroplasts — Bacteria like elements withinner membrane highly folded.
(d)Golgi apparatus — Stacks of flattened vesicles.

45. Assertion Smaller the organism higher is the rate of metabolism per gram weight.
Reason The heart rate of six months old baby is much higher than that of an old person.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true, but Reason is not the correct explantion of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

Answers :