Sexual Reproduction in Flowering Plants

NEET Biology · 120 questions · Page 10 of 12 · Click an option or "Show Solution" to reveal answer

Q91

What does the filiform apparatus do at the entrance into ovule?

A It helps in the entry of pollen tube into a synergid

B It prevents entry of more than one pollen tube into the embryo sac

C It brings about the opening of the pollen tube

D It guides pollen tube from a synergid to egg

Correct Answer

Option A

Solution

(a) Filiform apparatus guides pollen tube entry into the synergid.

Q92

In which one of the following, both autogamy and geitonogamy are prevented?

A Maize

B Wheat

C Papaya

D Castor

Correct Answer

Option C

Solution

Q93

Unisexuality of flowers prevents

A autogamy, but not geitonogamy

B both geitonogamy and xenogamy

C geitonogamy, but not xenogamy

D autogamy and geitonogamy

Correct Answer

Option A

Solution

(a) Unisexuality prevents autogamy (same flower) but not geitonogamy (different flower on same plant).

Q94

Wind pollinated flowers are

A small, brightly coloured, producing large number of pollen grains

B small, producing large number of dry pollen grains

C large producing abundant nectar and pollen

D small, producing nectar and dry pollen

Correct Answer

Option B

Solution

(b) Anemophilous flowers: small, produce large numbers of dry, light pollen grains.

Q95

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called

A Xenogamy

B Geitonogamy

C Karyogamy

D Autogamy

Correct Answer

Option B

Solution

(b) Geitonogamy: pollen from anther to stigma of another flower on the same plant.

Q96

Double fertilization is fusion of

A two eggs

B two eggs and polar nuclei with pollen nuclei

C one male gamete with egg and other with synergid

D one male gamete with egg and other with secondary nucleus

Correct Answer

Option D

Solution

(d) Double fertilization: syngamy (egg + male gamete) + triple fusion (2 polar nuclei + male gamete).

Q97

In angiosperms all the four microspores of tetrad are covered by a layer formed by

A pectocellulose

B callose

C cellulase

D sporopollenin

Correct Answer

Option D

Solution

(d) The outer covering (exine) of pollen grain is made of sporopollenin.

Q98

The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?

A Cotyledon

B Endosperm

C Aleurone layer

D Plumule

Correct Answer

Option A

Solution

(a) Scutellum = modified cotyledon in grass family seeds.

Q99

Apomictic embryos in citrus arise from

A Synergids

B Maternal sporophytic tissue in ovule

C Antipodal cells

D Diploid egg

Correct Answer

Option B

Solution

(b) Apomictic embryos in citrus arise from maternal sporophytic tissue (nucellus/integuments).

Q100

A drupe develops in

A mango

B wheat

C pea

D tomato

Correct Answer

Option A

Solution

(a) Drupe: fleshy fruit with hard endocarp (stone); e.g., mango, plum.

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