Sexual Reproduction in Flowering Plants — Page 4 | NEET Biology

Q31

Male gametophyte of angiosperms is shed as

A four celled pollen grain

B three celled pollen grain

C microspore mother cell

D anther

Correct Answer

Option B

Solution

(b) Most angiosperms shed pollen at 2-celled or 3-celled stage (2+1 or 3-celled).

Q32

Which is correct about gametes?

A Gametes are invariably haploid

B Spores are invariably haploid

C Gametes are generally haploid

D Both spores and gametes are invariably haploid

Correct Answer

Option A

Solution

(a) Gametes are always haploid (formed by meiosis).

Q33

Generative cell was destroyed by laser but a normal pollen tube was still formed because

A vegetative cell is not damaged

B contents of killed generative cell stimulate pollen growth

C laser beam stimulates growth of pollen tube

D the region of emergence of pollen tube is not harmed

Correct Answer

Option A

Solution

(a) Pollen tube is formed by the vegetative cell — independent of generative cell.

Q34

Entry of pollen tube through micropyle is

A Chalazogamy

B Mesogamy

C Porogamy

D Pseudogamy

Correct Answer

Option C

Solution

(c) Porogamy: pollen tube enters ovule through the micropyle.

Q35

Female gametophyte of angiosperms is represented by

A Ovule

B Megaspore mother cell

C Embryo sac

D Nucellus

Correct Answer

Option C

Solution

(c) Embryo sac is the female gametophyte of angiosperms (7-celled, 8-nucleate).

Q36

Male gametophyte of angiosperms is

A Microsporangium

B Nucellus

C Microspore

D Stamen

Correct Answer

Option C

Solution

(c) Microspore is the first cell of the male gametophytic generation in angiosperms.

Q37

Which ones produces androgenic haploids in anther cultures?

A Anther wall

B Tapetal layer of anther wall

C Connective tissue

D Young pollen grains

Correct Answer

Option D

Solution

(d) Young pollen grains (microspores) produce androgenic haploids in anther culture.

Q38

Syngamy means

A fusion of gametes

B fusion of cytoplasms

C fusion of two similar spores

D fusion of two dissimilar spores

Correct Answer

Option A

Solution

(a) Syngamy = fusion of male gamete with the egg.

Q39

Point out the odd one — pollen grain is not part of ovule

A Nucellus

B Embryo sac

C Micropyle

D Pollen grain

Correct Answer

Option D

Solution

(d) Nucellus, embryo sac, and micropyle are all parts of the ovule; pollen grain is the male gametophyte.

Q40

Attractants and rewards are required for

A Entomophily

B Hydrophily

C Cleistogamy

D Anemophily

Correct Answer

Option A

Solution

(a) Insect-pollinated flowers (entomophily) attract pollinators with rewards like nectar and pollen.