Sexual Reproduction in Flowering Plants — Page 6 | NEET Biology

Q51

In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?

A 25

B 50

C 75

D 100

Correct Answer

Option A

Solution

(a) 4 pollen per MMC; 100/4 = 25 MMCs.

Q52

How many pollen grains will be formed after meiotic division in ten microspore mother cells?

A 10

B 20

C 40

D 80

Correct Answer

Option C

Solution

(c) Each MMC produces 4 pollen grains; 10 × 4 = 40.

Q53

Flowers showing ornithophily show few characteristics like

A blue flower with nectaries at base of corolla

B red sweet scented flower with nectaries

C bright red flower into thick inflorescence

D white flowers with fragrance

Correct Answer

Option B

Solution

(b) Bird-pollinated flowers: bright red/yellow, large, tubular, nectar-rich.

Q54

The endosperm of gymnosperm is

A triploid

B haploid

C diploid

D polyploid

Correct Answer

Option B

Solution

(b) In gymnosperms, endosperm is the female gametophyte — haploid.

Q55

Eight nucleate embryo sacs are

A always tetrasporic

B always monosporic

C always bisporic

D sometime monosporic, sometimes bisporic and sometimes tetrasporic

Correct Answer

Option D

Solution

(d) 8-nucleate embryo sacs can develop from mono-, bi- or tetrasporic megaspores.

Q56

Anemophily type of pollination is found in

A Salvia divinorum

B Bottle brush

C Vallisneria

D Coconut

Correct Answer

Option D

Solution

(d) Coconut is wind-pollinated (anemophilous).

Q57

What is the direction of micropyle in anatropous ovule?

A upward

B downward

C right

D left

Correct Answer

Option B

Solution

(b) In anatropous ovule the body is inverted; micropyle points downward toward the funicle.

Q58

In angiosperms pollen tubes liberate their male gametes into the

A central cell

B antipodal cell

C egg cell

D synergids

Correct Answer

Option D

Solution

(d) Pollen tube discharges male gametes into the synergids.

Q59

In a flowering plant, archesporium gives rise to

A only tapetum and sporogenous cells

B only the wall of the sporangium

C both wall and the sporogenous cells

D wall and the tapetum

Correct Answer

Option C

Solution

(c) Archesporium divides to form primary parietal layer (wall) and sporogenous cells.

Q60

What is the fate of the male gametes discharged in the synergid?

A One fuses with the egg, other(s) degenerate(s) in the synergid.

B All fuse with the egg.

C One fuses with the egg, other(s) fuse(s) with synergid nucleus.

D One fuses with the egg and other fuses with central cell nuclei.

Correct Answer

Option D

Solution

(d) One male gamete fuses with egg (syngamy); the other fuses with two polar nuclei (triple fusion).