Multiple Choice QuestionsAssertion : 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
B.
If both Assertion and Reason are true but the reason is not the correct explanation of the assertion
Some trees of hill like oak, ash, elm, hickory, pecan and mountain cedar produce allergic pollen grains which cause allergy to people. Signs and Symptoms of pollen allergy are
(i) sneezing
(ii) itching eyes, nose and throat
(iii) dark circles under the eyes caused by restricted blood flow near the sinuses
(iv) watering eyes
(v) conjunctivitis
Conifer trees produce a large quantity of wind borne pollen grains because many pollen grains are destroyed in the process of pollination done by wind.
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.
During 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
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
When the filament runs throughout the length of anther, it is called
adnate
dorsi fixed
versatile
syngenesious
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