Sexual Reproduction in Flowering Plants

Q1 FREE PREVIEW

PYQ

Unisexuality of flowers prevents;

ageitonogamy, but not xenogamy.

bautogamy and geitonogamy.

cautogamy, but not geitonogamy.

dboth geitonogamy and xenogamy.

✓ Correct answer: c) autogamy, but not geitonogamy.

ExplanationUnisexual flowers have either stamens (male) or carpels (female), so a single flower cannot self-pollinate, preventing autogamy.However, a plant with multiple unisexual flowers (especially monoecious plants) can still have pollen from male flowers reach female flowers on the same plant, allowing geitonogamy.Xenogamy (cross-pollination between different plants) is still possible.Thus, unisexuality specifically prevents self-pollination within the same flower but does not stop pollination between different flowers of the same plant.

Q2 FREE PREVIEW

PYQ

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

abee

bwind

cbat

dwater

✓ Correct answer: b) wind

ExplanationFlowers with a single ovule per ovary and arranged in inflorescences (like grasses) are typically small, inconspicuous, and lack nectar or scent.These features are adaptations for wind pollination (anemophily).The large number of flowers in an inflorescence increases the chance of pollen reaching another flower.Other pollinators: Bee – attracted to colorful, nectar- rich flowers.Bat – active at night; flowers are large, fragrant, and pale-colored.Water – occurs in hydrophilous plants.

Q3 FREE PREVIEW

PYQ

Persistent nucellus in the seed is known as;

ategmen

bchalaza

cperisperm

dhilum

✓ Correct answer: c) perisperm

ExplanationIn some seeds such as black pepper and beet, remnants of nucellus are also persistent.This residual, persistent nucellus is the perisperm.

Q4

PYQ

What is the fate of the male gametes discharged in the synergid? [NEET 2019]

aOne fuses with egg, others degenerates in the synergid.

bAll fuse with the egg.

cOne fuses with the egg, others fuses with synergid nucleus.

dOne fuses with the egg and other fuses with central cell nuclei.

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Q5

PYQ

In some members of which of the following pairs of families, pollen grains retain their viability for months after release? [NEET 2021]

aPoaceae; Leguminosae

bPoaceae; Solanaceae

cRosaceae ; Leguminosae

dPoaceae ; Rosaceae

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Q6

PYQ

Identify the correct description about the given figure: [NEET 2024]

aCompact inflorescence showing complete autogamy.

bWind pollinated plant inflorescence showing flowers with well exposed stamens.

cWater pollinated flowers showing stamens with mucilaginous covering.

dCleistogamous flowers showing autogamy.

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Q7

PYQ

Which of the following is incorrect for wind pollinated plants? [Re-NEET 2020]

aPollen grains are light and non-sticky

bWell exposed stamens and stigma

cMany ovules in each ovary

dFlowers are small and not brightly coloured

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Q8

PYQ

Pollen grains remain preserved as fossils due to the presence of :

[Re-NEET 2024]

a

Epidermal layer

b

Tapetum

c

Exine layer

d

Intine layer

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Q9

PYQ

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A typical unfertilised, angiosperm embryo sac at maturity is 8 nucleate and 7-celled.
Reason (R): The egg apparatus has 2 polar nuclei.
In the light of the above statements, choose the correct answer from the options given below :

[NEET 2025]

a

A is true but R is false

b

A is false but R is true

c

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

d

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

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Q10

PYQ

Pollen grains remain preserved as fossils due to the presence of :

[Re-NEET 2024]

a

Epidermal layer

b

Tapetum

c

Exine layer

d

Intine layer

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Q11

PYQ

Arrange the following in the correct developmental sequence related to microsporogenesis :
A. Microspore tetrads
B. Sporogenous tissue
C. Pollen grains
D. Pollen mother cells

Choose the correct answer from the options given below:

[NEET 2026]

a

D, A, C, B

b

B, D, C, A

c

B, D, A, C

d

A, D, C, B

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Q12

PYQ

Which one of the following is a triploid cell ?

[NEET 2026]

a

Central cell

b

Primary endosperm cell

c

Zygote

d

Synergid

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Q13

PYQ

Which part of the ovule stores reserve food materials?

[Re-NEET 2024]

a

Nucellus

b

Integument

c

Placenta

d

Funicle

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Q14

PYQ

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:

[NEET 2024]

a

B, C, D and E only

b

C, D and E only

c

A, B, C and D only

d

A, C, D and E only

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Q15

PYQ

If the diploid chromosome number of typical angiosperm is 36, what would be the chromosome number in its endosperm?

[Re-NEET 2026]

a

18

b

36

c

54

d

72

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Q16

PYQ

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Both wind and water pollinated flowers are not very colourful and do not produce nectar.
Reason (R): The flowers produce enormous amount of pollen grains in wind and water pollinated flowers.
In the light of the above statements, choose the correct answer from the options given below:

[NEET 2025]

a

A is true but R is false

b

A is false but R is true

c

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

d

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

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Q17

PYQ

Which one of the following types of pollination brings genetically different types of pollen grains to the stigma ?

[NEET 2026]

a

Geitonogamy

b

Autogamy

c

Xenogamy

d

Cleistogamy

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Q18

PYQ

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
Reason (R): Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells
In light of the above statements, choose the most appropriate answer from the options given below:

[NEET 2025]

a

A is true but Ris false

b

A is false but R is true

c

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

d

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

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Q19

PYQ

Which of the following plant produces non-albuminous seeds?

[Re-NEET 2026]

a

Wheat

b

Maize

c

Barley

d

Pea

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Q20

PYQ

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:

[NEET 2024]

a

B, C, D and E only

b

C, D and E only

c

A, B, C and D only

d

A, C, D and E only

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Q21

PYQ

Which part of the ovule stores reserve food materials?

a

Nucellus

b

Integument

c

Placenta

d

Funicle

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Q22

PYQ

The term used for transfer of pollen grains from anthers of one plant to stigma of different plant which, during pollination, brings genetically different types of pollen grains to stigma, is:

[NEET 2021]

a

Geitonogamy

b

Chasmogamy

c

Cleistogamy

d

Xenogamy

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Q23

PYQ

In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are

[NEET 2023]

a

Antipodals, synergids, and primary endosperm nucleus

b

Synergids, Zygote and Primary endosperm nucleus

c

Synergids, antipodals and Polar nuclei

d

Synergids, Primary endosperm nucleus and zygote

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Q24

PYQ

Large, colourful, fragrant flowers with nectar are seen in

[NEET 2023]

a

bird pollinated plants

b

bat pollinated plants

c

wind pollinated plants

d

insect pollinated plants

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Q25

PYQ

What is the function of ears in the corn cob?

a

To trap pollen grains

b

To disperse pollen grains

c

To protect seeds

d

To attract insects

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Q26

PYQ

What is the function of tassels in the corn cob?

[NEET 2023]

a

To trap pollen grains

b

To disperse pollen grains

c

To protect seeds

d

To attract insects

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Q27

PYQ

The plant parts which consist of two generations one within the other

(1) pollen grains inside the anther

(2) germinated pollen grain with two male gametes

(3) seed inside the fruit

(4) embryo sac inside the ovule

[NEET 2020]

a

(1) only

b

(1), (2), and (3)

c

(3) and (4)

d

(1) and (4)

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Q28

PYQ

Which of the following is incorrect for wind-pollinated plants?

a

Many ovules in each ovary

b

Flowers are small and not brightly coloured

c

Pollen grains are light and non-sticky

d

Well exposed stamens and stigma

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Q29

PYQ

A typical angiosperm embryo sac at maturity, though 8 nucleate is 7 celled, because

[NEET 2021]

a

synergid cell has 2 nuclei

b

central cell has 2 nuclei

c

antipodal cell has 2 nuclei

d

egg cell has 2 nuclei

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Q30

PYQ

In water hyacinth and water lily, pollination takes place by

[NEET 2020]

a

insects or wind

b

water currents only

c

wind and water

d

insects and water.

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Q31

PYQ

The body of the ovule is fused within the funicle at ______________

[NEET 2020]

a

Micropyle

b

Nucellus

c

Chalaza

d

Hilum

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Q32

PYQ

In some plants thalamus contributes to fruit formation. Such fruits are termed as

a

Aggregate fruits

b

True fruits

c

Parthenocarpic fruit

d

False fruits

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