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Q 1.    

Correct4

Incorrect-1

Functional megaspore in an angiosperm develops into an

A

endosperm

embryo sac

C

embryo

D

ovule.

Explanation

In angiosperms, the functionalmegaspore is the first cell of femalegametophyte. It enlarges and undergoes few mitotic divisions toform embryo sac.

Q 2.    

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Incorrect-1

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

A

bee

wind

C

bat

D

water.

Explanation

Single ovule in the ovary and flowers packed into inflorescence are characteristics of wind pollinated flowers.

Q 3.    

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Incorrect-1

A dioecious flowering plant prevents both

autogamy and geitonogamy

B

geitonogamy and xenogamy

C

cleistogamy and xenogamy

D

autogamy and xenogamy.

Explanation

Dioecious plants are those plants in which male flowers and female flowers are borne on different plants. Therefore, they prevent both autogamy and geitonogamy.

Q 4.    

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Incorrect-1

Double fertilisation is exhibited by

A

algae

B

fungi

angiosperms

D

gymnosperms.

Explanation

Double fertilisation is the characteristicfeature of angiosperms. Here, two male gametesare released in the embryo sac or femalegametophyte. One male gamete fuses with the eggcell to form zygote that gives rise to embryo whereasthe other male gamete fuses with the secondarynucleus to form primary endosperm nucleus (PEN)that gives rise to endosperm.

Q 5.    

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Incorrect-1

In majority of angiosperms

A

egg has a filiform apparatus

B

there are numerous antipodal cells

reduction division occurs in the megaspore mother cells

D

a small central cell is present in that embryo sac.

Explanation

{tex} ( \mathrm { c } ) {/tex}

Q 6.    

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Incorrect-1

Pollination in water hyacinth and water lily is brought about by the agency of

A

water

insects or wind

C

birds

D

bats.

Explanation

In aquatic plants with emergent flowers e.g., water lily, water hyacinth pollination takes place by wind or insects.

Q 7.    

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Incorrect-1

The ovule of an angiosperm is technically equivalent to

megasporangium

B

megasporophyll

C

megaspore mother cell

D

megaspore.

Explanation

The ovule of an angiosperm is equivalent to integumented megasporangium.

Q 8.    

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Incorrect-1

The coconut water from tender coconut represents

A

free nuclear proembryo

free nuclear endosperm

C

endocarp

D

fleshy mesocarp.

Explanation

Coconut has multicellular endosperm (called coconut meal) in the outer part and free nuclear as well as vacuolate endosperm (called coconut milk or coconut water) in the centre.

Q 9.    

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Incorrect-1

Which one of the following statements is nottrue{tex}?{/tex}

A

Pollen grains of many species cause severe allergies.

B

Stored pollen in liquid nitrogen can be used in the crop breeding programmes.

Tapetum helps in the dehiscence of anther.

D

Exine of pollen grains is made up of sporopollenin.

Explanation

Tapetum is the innermost wall layer ofmicrosporangium that nourishes developing pollengrains.

Q 10.    

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Incorrect-1

Seed formation without fertilisation in flowering plants involves the process of

A

somatic hybridisation

apomixis

C

sporulation

D

budding.

Explanation

Apomixis is a reproductive process which does not involve gametic fusion. In apomictic flowering plants there is no fertilisation and embryos develop simply by division of a cell of ovule.

Q 11.    

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Incorrect-1

Which of the following statements is not correct{tex}?{/tex}

A

Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.

B

Some reptiles have also been reported as pollinators in some plant species.

Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.

D

Insects that consume pollen or nectar without bringing about pollination arecalled pollen/ nectar robbers.

Explanation

Pollen-pistil interaction is the group of events that occur from the time of pollen deposition
over the stigma to the time of pollen tube entry intoovule. It is a safety measure to ensure thatillegitimate crossing does not occur. Pollen grainsof number of plants may settle over a stigma. Thepollens belonging to same species would germinatewhile other fail to do so but the pollen tube of thecompatible pollen will grow through the style toreach the ovule whereas growth of incompatiblepollens will be arrested at stigmatic disc orsometimes in the beginning part of style.

Q 12.    

Correct4

Incorrect-1

Proximal end of the filament of stamen is attached to the

A

placenta

thalamus or petal

C

anther

D

connective.

Explanation

{tex} ( b ) {/tex}

Q 13.    

Correct4

Incorrect-1

Filiform apparatus is characteristic feature of

A

aleurone cell

synergids

C

generative cell

D

nucellar embryo.

Explanation

Filliform apparatus is a mass of finger like projections of the wall into the cytoplasm. It is present in synergids (help cells) of the embryo sac, in the micropylar region. It guards the pollen tube inside the ovule towards the embryo sac.

Q 14.    

Correct4

Incorrect-1

In angiosperms, microsporogenesis and mega sporogenesis

involve meiosis

B

occur in ovule

C

occur in anther

D

form gametes without further divisions.

Explanation

In angiosperms, microsporogenesis i.e.,formation of microspores (or pollen grains) occursby the meiotic divisions of diploid microsporemother cells (or pollen mother cells).Microsporogenesis takes place in the anther.Megasporogenesis i.e. formation of megasporesoccurs by the meiotic divisions of diploidmegaspore mother cells. Megasporogenesis takesplace in the ovule.

Q 15.    

Correct4

Incorrect-1

Flowers are unisexual in

A

China rose

B

onion

C

pea

cucumber.

Explanation

In cucumber, unisexual flowers {tex} i . e . . {/tex} separate male and female flowers are present on the same plant (monoecious plant).

Q 16.    

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Incorrect-1

Which one of the following fruits is parthenocarpic{tex}?{/tex}

A

Jackfruit

Banana

C

Brinjal

D

Apple

Explanation

Parthenocarpic fruits are the fruits which are formed without fertilisation. These fruits are naturally seedless, e.g., banana.

Q 17.    

Correct4

Incorrect-1

Male gametophyte in angiosperms produces

A

single sperm and two vegetative cells

B

three sperms

two sperms and a vegetative cell

D

single sperm and a vegetative cell.

Explanation

The protoplast of the male gametophyte divides mitotically to produce two unequal cells a small generative cell and a large vegetative cell.The generative cell divides later into two non-motilemale gametes (or sperms). Thus, the malegametophyte in angiosperms produces two spermsand a vegetative cell. The vegetative cell, later on,grows to produce pollen tube.

Q 18.    

Correct4

Incorrect-1

Which of the following are the important floral rewards to the animal pollinators{tex}?{/tex}

A

Floral fragrance and calcium crystals

Protein pellicle and stigmatic exudates

C

Colour and large size of flower

D

Nectar and pollen grains

Explanation

{tex} ( \mathrm { d } ) {/tex}

Q 19.    

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Incorrect-1

Which one of the following may requirepollinators, but is genetically similar toautogamy{tex}?{/tex}

A

Apogamy

B

Cleistogamy

Geitonogamy

D

Xenogamy

Explanation

Geitonogamy involves transfer of the pollen from one flower of a plant to the stigma of another flower of the same plant. As the pollen has to move from one flower to another flower, it requires a pollinating agent. Yet it is genetically similar to autogamy, as both the flowers of the plant, share the same genotype of the plant.

Q 20.    

Correct4

Incorrect-1

Which one of the following statements is not true{tex}?{/tex}

A

The flowers pollinated by flies and bats secrete foul odour to attract them.

B

Honey is made by bees by digesting pollen collected from flowers.

C

Pollen grains are rich in nutrients and they are used in the form of tablets and syrups.

Pollen grains of some plants cause severe allergies and bronchial afflictions in some people.

Explanation

Honey is made from nectar through aprocess of regurgitation and evaporation.
Honeybees transform saccharides (carbohydrates)into honey by regurgitating it a number of times,until it is partially digested. The bees do theregurgitation and digestion as a group. After thelast regurgitation, the aqueous solution is still highin water, the process continues by evaporation ofmuch of the water and enzymatic transformation.Honey is produced by bees as a food source.

Q 21.    

Correct4

Incorrect-1

The hilum is a scar on the

fruit, where style was present

B

seed, where micropyle was present

C

seed, where funicle was attached

D

fruit, where it was attached to pedicel.

Explanation

Ovule is an integumented megasporangium found in spermatophytes which develops into seed after fertilization. An angiospermic ovule is typically an ovoid and whitish structure. It occurs inside ovary where it is attached to a parenchymatous cushion called
placenta either singly or in a cluster. The ovule is stalked. The stalk is called funiculus or funicle. The point of attachment of the body of the ovule with the funiculus is known as hilum. It is present as a scar on a mature seed.

Q 22.    

Correct4

Incorrect-1

Transmission tissue is characteristic feature of

dry stigma

B

wet stigma

C

hollow style

D

solid style.

Explanation

Style is traversed by the pollen tube to reach the ovule. It is of two types - hollow and solid. In hollow styles, the stylar canal is lined byglandular cells, which are usually multinucleate and polyploid whereas solid style has a core of transmitting tissue, composed of thin walled cells, through which, the pollen tube moves.

Q 23.    

Correct4

Incorrect-1

Which-one of the following shows isogamy with non-flagellated gametes{tex}?{/tex}

Sargassum

B

Ectocarpus

C

Ulothrix

D

Spirogyra

Explanation

Sexual reproduction in algae takes place through fusion of two gametes. In Spirogyra, the gametes are similar in size (isogamy) and non- flagellated (non-motile).

Q 24.    

Correct4

Incorrect-1

Geitonogamy involves

A

fertilization of a flower by the pollen from another flower of the same plant

fertilization of a flower by the pollen from the same flower

C

fertilization of a flower by the pollen from a flower of another plant in the same population

D

fertilization of a flower by the pollen from a flower of another plant belonging to a a distant population.

Explanation

Geitonogamy is the pollination taking place between the two flowers of the same plant or genetically similar plant. Hence, genetically it is self pollination but since the agency is involved, it is ecologically, cross pollination.

Q 25.    

Correct4

Incorrect-1

An aggregate fruit is one which develops from

multicarpellary syncarpous gynoecium

B

multicarpellary apocarpus gynoecium

C

complete inflorescence

D

multicarpellary superior ovary.

Explanation

An aggregate fruit or etario is a group ofsimple fruitlets that develop from free ovaries(apocarpus condition) of a single flower (singlegynoecium).