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The exine of a pollen grain is composed ...

The exine of a pollen grain is composed of one of the most resistant biological matieral by which pollen grains are able to withstand extremes of temperature and dessication and cannot be degraded by any enzyme is

A

lignocellulose

B

sporopollenin

C

cellulose and lignin

D

pectin and cellulose

Text Solution

Verified by Experts

The correct Answer is:
B
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TRUEMAN BIOLOGY-SEXUAL REPRODUCTION IN FLOWERING PLANTS-MULTIPLE CHOICE QUESTIONS
  1. In dicots, at how many places exine is absent in the pollen grain ?

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  2. Which one is larger nucleus in pollen grain ?

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

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  4. Genotypically the pollen grains produced inside the anther belong to 1...

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  5. Germ pore is the area where exine is

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  6. A plant root has 16 chromosomes , so

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  7. Sculpturing of exine of pollen is important in

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  8. Ovule is technically equivalent to 1. megasporangium with one megaspor...

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  9. Ovule is attached to the placenta by a stalk known as 1. funicle 2. ...

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

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  11. In tenuinucellate type of ovule

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  12. Crassinucellate ovule shows: 1. Developed nucellus 2. Partially dev...

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

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

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

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  16. Female gametophyte (megagametophyte of aniosperms) is represented b...

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

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  18. Number of chromosomes is 24 in nucellus. Number of chromosomes in micr...

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  19. Base of nucellus from which integument arises is

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  20. The megasporangium of the angiosperms on maturation gives rise to

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