Multiple Choice QuestionsPollen grains are able to withstand extremes of temperature and dessication because their exine is composed of
cutin
suberin
sporopollenin
callose
When the filament runs throughout the length of anther, it is called
adnate
dorsi fixed
versatile
syngenesious
During formation of which of the following free nuclear division occurs?
Flower
Endosperm
Gametes
Fruit
B.
Endosperm
In nuclear endosperm the primary endosperm nucleus divides repeatedly without wall formation producing a large number of free nuclei. It is most common type of endosperm.
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
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.
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.
If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?
4
8
12
16
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