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In angiosperm polle grains are dehisced ...

In angiosperm polle grains are dehisced at

A

4 celled stage

B

mostly at 2 and sometimes at 3 called stage

C

3 called stage

D

pollen tube stage

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The correct Answer is:
B
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In over 60% of angiosperms pollen grains are shed at

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In 40% angiosperms the pollen grains are shed at

In over 40% of angiosperms, pollen grains are shed at 3 celled stage, these 3 cells are :

A. The pollen grain is generally spherical measuring about 25 - 50 cm in diameter. B. In over 60% of angiosperms , pollen grains are shed at 2 celled stage. Select the statement that holds true for the above statement .

What words will correct fill (a) , (b),(c) and (d) in the following paragraph ? (a) developed into a pollen grain. The outer layer is (b) and inner layer is intine . The inner layer is made up to cellulose and ( c) .In 60% of the angiosperms, pollen grains are shed at (d) celled stage .

What is the function of exine of an angiosperm pollen grains ? Name the organic materials, it is made up of .

Name the organic materials the exine and latine of an angiosperm pollen grains are made up of. Explain the role of exine.

TRUEMAN BIOLOGY-SEXUAL REPRODUCTION IN FLOWERING PLANTS-MULTIPLE CHOICE QUESTIONS
  1. Pollen tube is made up of

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  2. The intine of a pollen grain is mainly made up of

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  3. In angiosperm polle grains are dehisced at

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  4. In dicots, at how many places exine is absent in the pollen grain ?

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  5. Which one is larger nucleus in pollen grain ?

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  6. The exine of a pollen grain is composed of one of the most resistant ...

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  7. Genotypically the pollen grain proudcedin side the anther belong to

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  8. Germ pore is the area where exine is

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  9. A plant root has 16 chromosomes , so

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  10. Sculpturing of exine of pollen is important in

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  11. Ovule is technically equivalent to

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  12. Ovule is attached to the placenta by a stalk known as

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  13. Collar like outgrowth arising from the base of ovule and forming is a ...

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  14. In tenuinucellate type of ovule

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  15. Crassinucellate ovule shows:

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  16. When ovule is straight with funiculus, embryo sac, chalaza and microp...

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  17. Ovule is inverted (resupinates at 180^(@)) with body fused to funicle,...

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  18. Ovule of Opuntia is coiled and turn at more kthan 360^(@) angle, i...

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  19. Female gametophyte (megagametophyte of angiosperms) is represented ...

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  20. The female gametophyte (embryo sac( of a typical dicot (Polygonum) at...

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