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What is the size of pollen grain in angiosperm plants?

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Important Questions on Sexual Reproduction in Flowering Plants

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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 19
Pollination through the agency of insects is known as
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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 20
75-80% of insect pollination is achieved with the help of _____
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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 21

Pollen grains

(a) Are generally spherical

(b) Can be preserved as fossils

(c) Of some anemophilous species may cause pollen allergy

(d) Are always diploid

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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 22
At what stage of endosperm development, you will observe nuclear or cellular type of endosperm?
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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 23
When the pollen grains are not transferred from anthers to the stigma in a flower due to the barrier or fence it is referred as (or when some natural barrier exists between androecium and gynoecium to check self-pollination is known as)
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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 24
In Angiosperms, the functional megaspore of a linear tetrad is the
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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 25

Pollen grain loses its viability within half an hour of its release in

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Biology Crash Course NEET>Chapter 24 - Sexual Reproduction in Flowering Plants>Level 2>Q 26

Which of the following plants causes pollen allergy?