If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?

• 4

• 8

• 12

• 16

Megasporophyll of Cycas has the same nature as

• stamen

• petal

• sepal

• carpel

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.

4.

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.

Elater mechanism for seed dispersal is exhibited by

• Riccia

• Dryopteris

• Funaria

• Marchantia

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

• Flower

• Endosperm

• Gametes

• Fruit

Xenia and metaxenia terms are related with

• pollen culture

• xylem and phloem

• endosperm

• embryo

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

• adnate

• dorsi fixed

• versatile

• syngenesious

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

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

• cutin

• suberin

• sporopollenin

• callose