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# 1.If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?4 8 12 16

D.

16

Each microspore mother cell divides meiotically to form 4 pollen grains (4 $×$ 4 = 16).

2.

Assertion : The two cotyledons in the seed are often referred to as the embryonic leaves.

Reason : The embryo contains radicle and plumule.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

3.

Assertion : Many visitors to the hills suffer from skin and respiratory allergy problem.

Reason : Conifer trees produce a large quantity of wind-borne pollen grains.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

4.

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

• cutin

• suberin

• sporopollenin

• callose

5.

Megasporophyll of Cycas has the same nature as

• stamen

• petal

• sepal

• carpel

6.

Elater mechanism for seed dispersal is exhibited by

• Riccia

• Dryopteris

• Funaria

• Marchantia

7.

Assertion : The megaspore mother cell undergoes mitosis to produce four megaspores.

Reason : Megaspore mother cells and the megaspores are both haploid.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

8.

During formation of which of the following free nuclear division occurs?

• Flower

• Endosperm

• Gametes

• Fruit

9.

When the filament runs throughout the length of anther, it is called

• dorsi fixed

• versatile

• syngenesious

10.

Xenia and metaxenia terms are related with

• pollen culture

• xylem and phloem

• endosperm

• embryo