Neet Biology [2025]

Question 1

Which of the following are required for the dark reaction of photosynthesis?
A. Light
B. Chlorophyll
C. CO₂
D. ATP
E. NADPH
Choose the correct answers from the options given below:

Accepted Answer

C, D and E only

Answer

A, B and C only

Answer

B, C and D only

Answer

D and E only

Question 2

Spindle fibers attach to kinetochores of chromosomes during

Accepted Answer

Metaphase

Answer

Prophase

Answer

Anaphase

Answer

Telophase

Question 3

Buliform cells are responsible for

Accepted Answer

Inward curling of leaves in monocots.

Answer

Protecting the plant from salt stress.

Answer

Increased photosynthesis in monocots.

Answer

Providing large spaces for storage of sugars.

Question 4

What is the fate of a piece of DNA carrying only gene of interest which is transferred into an alien organism?
A. The piece of DNA would be able to multiply itself independently in the progeny cells of the organism.
B. It may get integrated into the genome of the recipient.
C. It may multiply and be inherited along with the host DNA.
D. The alien piece of DNA is not an integral part of chromosome.
E. It shows ability to replicate.
Choose the correct answer from the options given below:

Accepted Answer

B and C only

Answer

A and B only

Answer

D and E only

Answer

A and E only

Question 5

Given below are two statements:
Statement I : Bit toxins are insect group specific and coded by a gene cry IAc.
Statement II : Bit toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Statement I is true but Statement II is false

Answer

Both Statement I and Statement II are true

Answer

Both Statement I and Statement II are false

Answer

Statement I is false but Statement II is true

Question 6

List of endangered species was released by

Accepted Answer

IUCN

Answer

GEAC

Answer

WWF

Answer

FOAM

Question 7

Identify the part of the seed from the given figure which is destined to form root when the seed germinates.

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 8

Accepted Answer

A-III, B-I, C-IV, D-II

Answer

A-III, B-I, C-II, D-IV

Answer

A-II, B-IV, C-III, D-I

Answer

A-IV, B-I, C-III, D-II

Question 9

Identify the type of flowers based on the position of calyx, corolla and androectum with respect to the ovary from the given figures (a) and (b).

Accepted Answer

(a) Perigynous; (b) Perigynous

Answer

(a) Epigynous; (b) Hypogynous

Answer

(a) Hypogynous; (b) Epigynous

Answer

(a) Perigynous; (b) Epigynous

Question 10

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin

Accepted Answer

does not affect mature monocotyledonous plants.

Answer

promotes apical dominance.

Answer

promotes abscission of mature leaves only.

Answer

can help in cell division in grasses, to produce growth.

Question 11

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

Accepted Answer

Red flowered as well as pink flowered plants

Answer

Only red flowered plants

Answer

Only pink flowered plants

Answer

Red, Pink as well as white flowered plants

Question 12

Which one of the following is not a criterion for classification of fungi?

Accepted Answer

Mode of nutrition

Answer

Morphology of mycelium

Answer

Mode of spore formation

Answer

Fruiting body

Question 13

The lactose present in the growth medium of bacteria is transported to the cell by the action of:

Accepted Answer

Permease

Answer

Beta-galactosidase

Answer

Acetylase

Answer

Polymerase

Question 14

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

Accepted Answer

bb

Answer

BB

Answer

Bb

Answer

BB/Bb

Question 15

Given below are two statements:
Statement I: Parenchyma is living but collenchyma is dead tissue.
Statement II: Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Statement I is false but Statement II is true

Answer

Both Statement I and Statement II are true

Answer

Both Statement I and Statement II are false

Answer

Statement I is true but Statement II is false

Question 16

How many molecules of ATP and NADPH are required for every molecule of CO₂ fixed in the Calvin cycle?

Accepted Answer

3 molecules of ATP and 2 molecules of NADPH.

Answer

2 molecules of ATP and 3 molecules of NADPH.

Answer

2 molecules of ATP and 2 molecules of NADPH.

Answer

3 molecules of ATP and 3 molecules of NADPH.

Question 17

A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and down stream end;

Accepted Answer

Promotor, Structural gene, Terminator

Answer

Repressor, Operator gene, Structural gene

Answer

Structural gene, Transposons, Operator gene

Answer

Inducer, Repressor, Structural gene

Question 18

Tropical regions show greatest level of species richness because
A. Tropical latitudes have remained relatively undisturbed for millions of years, hence more time was available for species diversification.
B. Tropical environments are more seasonal.
C. More solar energy is available in tropics.
D. Constant environments promote niche specialization.
E. Tropical environments are constant and predictable.
Choose the correct answer from the options given below:

Accepted Answer

A, C, D and E only

Answer

A and B only

Answer

A, B and E only

Answer

A, B and D only

Question 19

The equation of Verhulst-Pearl logistic growth is dN/dt = rN[(K-N)/K]. From this equation, K indicates :

Accepted Answer

Carrying capacity

Answer

Intrinsic rate of natural increase

Answer

Biotic potential

Answer

Population density

Question 20

Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of :

Accepted Answer

Competitive inhibition

Answer

Cofactor inhibition

Answer

Feedback inhibition

Answer

Enzyme activation

Question 21

Which one of the following can be explained on the basis of Mendel’s Law of Dominance?
A. Out of one pair of factors one is dominant and the other is recessive.
B. Alleles do not show any expression and both the characters appear as such in F2 generation.
C. Factors occur in pairs in normal diploid plants.
D. The discrete unit controlling a particular character is called factor.
E. The expression of only one of the parental characters is found in a monohybrid cross.
Choose the correct answer from the options given below :

Accepted Answer

A, C, D and E only

Answer

A, B and C only

Answer

B, C and D only

Answer

A, B, C, D and E

Question 22

Accepted Answer

A-III, B-II, C-IV, D-I

Answer

A-II, B-III, C-I, D-IV

Answer

A-III, B-IV, C-II, D-I

Answer

A-I, B-II, C-III, D-IV

Question 23

Identify the set of correct statements:
A. The flowers of Vallisneria are colourful and produce nectar.
B. The flowers of waterlily are not pollinated by water.
C. In most of water-pollinated species, the pollen grains are protected from wetting.
D. Pollen grains of some hydrophytes are long and ribbon like.
E. In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below:

Accepted Answer

B, C, D and E only

Answer

C, D and E only

Answer

A, B, C and D only

Answer

A, C, D and E only

Question 24

Accepted Answer

A-III, B-II, C-IV, D-I

Answer

A-I, B-III, C-II, D-IV

Answer

A-III, B-II, C-I, D-IV

Answer

A-IV, B-III, C-II, D-I

Question 25

Hind II always cuts DNA molecules at a particular point called recognition sequence and it consists of:

Accepted Answer

6 bp

Answer

8 bp

Answer

4 bp

Answer

10 bp

Question 26

Which of the following is an example of actionomorphic flower?

Accepted Answer

Datura

Answer

Cassia

Answer

Pisum

Answer

Sesbania

Question 27

The type of conservation in which the threatened species are taken out from their natural habitat and placed in special setting where they can be protected and given special care is called:

Accepted Answer

Biodiversity conservation

Answer

in-situ conservation

Answer

Semi-conservative method

Answer

Sustainable development

Question 28

Given below are two statements:
Statement-I: Chromosomes become gradually visible under light microscope during leptotene stage.
Statement-II: The begining of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Both Statement-I and Statement-II are true

Answer

Both Statement-I and Statement-II are false

Answer

Statement-I is true but Statement-II is false

Answer

Statement-I is false but Statement-II is true

Question 29

Formation of interfascicular cambium from fully developed parenchyma cells is an example for

Accepted Answer

Redifferentiation

Answer

Differentiation

Answer

Maturation

Question 30

The capacity to generate a whole plant from any cell of the plant is called:

Accepted Answer

Totipotency

Answer

Micropropagation

Answer

Differentiation

Answer

Somatic hybridization

Question 31

Accepted Answer

A-III, B-IV, C-I, D-II

Answer

A-I, B-II, C-III, D-IV

Answer

A-II, B-I, C-III, D-IV

Answer

A-IV, B-III, C-II, D-I

Question 32

The cofactor of the enzyme carboxypeptidase is:

Accepted Answer

Zinc

Answer

Niacin

Answer

Flavin

Answer

Haem

Question 33

These are regarded as major causes of biodiversity loss:
A. Over exploitation
B. Co-extinction
C. Mutation
D. Habitat loss and fragmentation
E. Migration
Choose the correct option:

Accepted Answer

A, B and D only

Answer

A, C and D only

Answer

A, B, C and D only

Answer

A, B and E only

Question 34

Accepted Answer

A–IV, B–II, C–I, D–III

Answer

A–IV, B–I, C–II, D–III

Answer

A–I, B–II, C–IV, D–III

Answer

A–III, B–I, C–IV, D–II

Question 35

Accepted Answer

A–IV, B–I, C–II, D–III

Answer

A–I, B–II, C–III, D–IV

Answer

A–II, B–III, C–IV, D–I

Answer

A–III, B–IV, C–I, D–II

Question 36

Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.

Accepted Answer

Succinyl-CoA → Succinic acid

Answer

Malic acid → Oxaloacetic acid

Answer

Succinic acid → Malic acid

Answer

Isocitrate → α-ketoglutaric acid

Question 37

Accepted Answer

A–II, B–I, C–IV, D–III

Answer

A–I, B–II, C–III, D–IV

Answer

A–III, B–IV, C–I, D–II

Answer

A–IV, B–III, C–II, D–I

Question 38

Accepted Answer

A–III, B–IV, C–I, D–II

Answer

A–III, B–II, C–I, D–IV

Answer

A–II, B–III, C–IV, D–I

Answer

A–IV, B–I, C–II, D–III

Question 39

Given below are two statements :
Statement I: In C3 plants, some O2 binds to RuBisCO, hence CO2 fixation is decreased.
Statement II: In C4 plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Statement I is true but Statement II is false

Answer

Both Statement I and Statement II are true

Answer

Both Statement I and Statement II are false

Answer

Statement I is false but Statement II is true

Question 40

Identify the correct description about the given figure :

Accepted Answer

Wind pollinated plant inflorescence showing flowers with well exposed stamens.

Answer

Water pollinated flowers showing stamens with mucilaginous covering.

Answer

Cleistogamous flowers showing autogamy

Answer

Compact inflorescence showing complete autogamy.

Question 41

Accepted Answer

A-II, B-IV, C-I, D-III

Answer

A-I, B-II, C-III, D-IV

Answer

A-IV, B-III, C-II, D-I

Answer

A-II, B-III, C-IV, D-I

Question 42

Read the following statements and choose the set of correct statements :
In the members of Phaeophyceae,
A. Asexual reproduction occurs usually by biflagellate zoospores.
B. Sexual reproduction is by oogamous method only.
C. Stored food is in the form of carbohydrates which is either mannitol or laminarin.
D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll.
E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.
Choose the correct answer from the options given below:

Accepted Answer

A, C, D and E only

Answer

A, B, C and D only

Answer

B, C, D and E only

Answer

A, B, C and E only

Question 43

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x (kcal m²) yr⁻¹, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem ?

Accepted Answer

10x (kcal m²) yr⁻¹

Answer

x/10 (kcal m²) yr⁻¹

Answer

x (kcal m²) yr⁻¹

Answer

100x/3x (kcal m²) yr⁻¹

Question 44

Which of the following statement is correct regarding the process of replication in E.coli?

Accepted Answer

The DNA dependent DNA polymerase catalyses polymerization in 5' → 3' direction.

Answer

The DNA dependent DNA polymerase catalyses polymerization in one direction that is 3' → 5'

Answer

The DNA dependent RNA polymerase catalyses polymerization in one direction, that is 5' → 3'

Answer

The DNA dependent DNA polymerase catalyses polymerization in 5' → 3' as well as 3' → 5' direction

Question 45

Which of the following are fused in somatic hybridization involving two varieties of plants?

Accepted Answer

Protoplasts

Answer

Callus

Answer

Somatic embryos

Answer

Pollens

Question 46

Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

Accepted Answer

Gibberellin

Answer

Auxin

Answer

Cytokinin

Answer

Abscisic acid

Question 47

Accepted Answer

A-III, B-I, C-IV, D-II

Answer

A-II, B-III, C-I, D-IV

Answer

A-I, B-III, C-II, D-IV

Answer

A-III, B-IV, C-II, D-I

Question 48

The DNA present in chloroplast is:

Accepted Answer

Circular, double stranded

Answer

Linear, double stranded

Answer

Linear, single stranded

Answer

Circular, single stranded

Question 49

Accepted Answer

A-III, B-I, C-II, D-IV

Answer

A-II, B-IV, C-III, D-I

Answer

A-I, B-III, C-II, D-IV

Answer

A-IV, B-II, C-III, D-I

Question 50

Accepted Answer

A-III, B-IV, C-I, D-II

Answer

A-IV, B-III, C-I, D-II

Answer

A-I, B-III, C-II, D-IV

Answer

A-II, B-I, C-III, D-IV

Question 51

Accepted Answer

A-III, B-I, C-IV, D-II

Answer

A-IV, B-II, C-III, D-I

Answer

A-I, B-III, C-II, D-IV

Answer

A-II, B-III, C-I, D-IV

Question 52

Which of the following are Autoimmune disorders?
A. Myasthenia gravis
B. Rheumatoid arthritis
C. Gout
D. Muscular dystrophy
E. Systemic Lupus Erythematosus (SLE)
Choose the most appropriate answer from the options given below:

Accepted Answer

A, B & E only

Answer

A, B & D only

Answer

B, C & E only

Answer

C, D & E only

Question 53

Which of the following is not a component of Fallopian tube?

Accepted Answer

Uterine fundus

Answer

Isthmus

Answer

Infundibulum

Answer

Ampulla

Question 54

The flippers of the Penguins and Dolphins are the example of the

Accepted Answer

Convergent evolution

Answer

Adaptive radiation

Answer

Natural selection

Answer

Divergent evolution

Question 55

Accepted Answer

A-III, B-IV, C-I, D-II

Answer

A-II, B-I, C-IV, D-III

Answer

A-III, B-I, C-II, D-IV

Answer

A-II, B-IV, C-I, D-III

Question 56

The following diagram showing restriction sites in E.coli cloning vector pBR322. Find the role of ‘X’ and ‘Y’ genes.

Accepted Answer

The gene ‘X’ is responsible for controlling the copy number of the linked DNA and ‘Y’ for protein involved in the replication of Plasmid.

Answer

The gene ‘X’ is responsible for resistance to antibiotics and ‘Y’ for protein involved in the replication of Plasmid.

Answer

The gene ‘X ’ is for protein involved in replication of Plasmid and ‘Y ’ for resistance to antibiotics.

Answer

Gene ‘X’ is responsible for recognition sites and ‘Y’ is responsible for antibiotic resistance.

Question 57

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Breast-feeding during initial period of infant growth is recommended by doctors for bringing a healthy baby.
Reason R: Colostrum contains several antibodies absolutely essential to develop resistance for the new born baby.
In the light of the above statements, choose the most appropriate answer from the options given below:

Accepted Answer

Both A and R are correct and R is the correct explanation of A.

Answer

Both A and R are correct but R is NOT the correct explanation of A.

Answer

A is correct but R is not correct.

Answer

A is not correct but R is correct.

Question 58

The "Ti plasmid" of Agrobacterium tumefaciens stands for

Accepted Answer

Tumor inducing plasmid

Answer

Tumour inhibiting plasmid

Answer

Tumor independent plasmid

Answer

Temperature independent plasmid

Question 59

Accepted Answer

A-II, B-I, C-IV, D-III

Answer

A-IV, B-II, C-III, D-I

Answer

A-II, B-IV, C-I, D-III

Answer

A-IV, B-III, C-II, D-I

Question 60

Given below are some stages of human evolution.
Arrange them in correct sequence (Past to Recent)
A. Homo habilis
B. Homo sapiens
C. Homo neanderthalensis
D. Homo erectus
Choose the correct sequence of human evolution from the options given below :

Accepted Answer

A-D-C-B

Answer

D-A-C-B

Answer

B-A-D-C

Answer

C-B-D-A

Question 61

The following are the statements about non-chordates:
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.

Accepted Answer

B, D & E only

Answer

A & C only

Answer

A, B & D only

Answer

B, C & D only

Question 62

In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on :

Accepted Answer

10th segment

Answer

5th segment

Answer

8th and 9th segment

Answer

11th segment

Question 63

Which one of the following factors will not affect the Hardy-Weinberg equilibrium ?

Accepted Answer

Constant gene pool

Answer

Genetic recombination

Answer

Genetic drift

Answer

Gene migration

Question 64

Accepted Answer

A-III, B-IV, C-II, D-I

Answer

A-II, B-III, C-I, D-IV

Answer

A-I, B-III, C-II, D-IV

Answer

A-II, B-I, C-III, D-IV

Questions in this Quiz

More Quizzes for Class Neet

Neet Biology [2025]

Questions in this Quiz

More Quizzes for Class Neet

Chemistry

Physics