Sexual Reproduction in Flowering Plants — Page 5 | NEET Biology

Q41

Which of the following pair has haploid structures?

A Nucellus and antipodal cells

B Antipodal cells and egg cell

C Antipodal cells and megaspore mother cell

D Nucellus and primary endosperm nucleus

Correct Answer

Option B

Solution

(b) Both antipodal cells and egg cell are haploid (n).

Q42

Embryo sac occurs in

A Embryo

B Axis part of embryo

C Ovule

D Endosperm

Correct Answer

Option C

Solution

(c) Embryo sac (female gametophyte) is located within the ovule.

Q43

Pollination occurs in plants

A Bryophytes and angiosperms

B Pteridophytes and angiosperms

C Angiosperms and gymnosperms

D Angiosperms and fungi

Correct Answer

Option C

Solution

(c) Pollen grains are found only in gymnosperms and angiosperms (spermatophytes).

Q44

Meiosis is best observed in dividing

A cells of apical meristem

B cells of lateral meristem

C microspores and anther wall

D microsporocytes

Correct Answer

Option D

Solution

(d) Microsporocytes (microspore mother cells) undergo meiosis.

Q45

Ovule is straight with funiculus, embryo sac, chalaza and micropyle lying on one straight line. It is

A Orthotropous

B Anatropous

C Campylotropous

D Amphitropous

Correct Answer

Option A

Solution

(a) Orthotropous ovule: all parts aligned on one straight vertical axis.

Q46

One of the most resistant biological material is

A lignin

B hemicellulose

C lignocellulose

D sporopollenin

Correct Answer

Option D

Solution

(d) Sporopollenin (pollen exine) is among the most resistant biological materials.

Q47

Fertilization involving carrying of male gametes by pollen tube is

A Porogamy

B Siphonogamy

C Chalazogamy

D Syngonogamy

Correct Answer

Option B

Solution

(b) Siphonogamy: male gametes carried by pollen tube (discovered by Strasburger, 1884).

Q48

Transfer of pollen to the stigma of another flower of the same plant is

A Autogamy

B Allogamy

C Xenogamy

D Geitonogamy

Correct Answer

Option D

Solution

(d) Geitonogamy: pollen transfer between flowers on the same plant.

Q49

Chief pollinators of agricultural crops are

A butterflies

B bees

C moths

D beetles

Correct Answer

Option B

Solution

(b) Bees pollinate about 80% of insect-pollinated crop flowers.

Q50

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

A -120°C

B -80°C

C -160°C

D -196°C

Correct Answer

Option D

Solution

(d) Pollen cryopreservation at -196°C in liquid nitrogen.