Multiple Choice QuestionsDuring formation of which of the following free nuclear division occurs?
Flower
Endosperm
Gametes
Fruit
Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of
cutin
suberin
sporopollenin
callose
Xenia and metaxenia terms are related with
pollen culture
xylem and phloem
endosperm
embryo
C.
endosperm
The direct or indirect effect of male parent (pollen grain) on structures inside embryo sac except embryo is knoqn as xenia.
Metaxenia may be defined as the effect of pollen on the seed coat or pericarp lying outside the embryo sac.
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
When the filament runs throughout the length of anther, it is called
adnate
dorsi fixed
versatile
syngenesious
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.
If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?
4
8
12
16
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.
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