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Exine of pollen grain...

Exine of pollen grain

A

is pectolcellulose

B

Exhibits a fascinating array of pattern and designs

C

has micropyle

D

is degraded by enzymes

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The correct Answer is:
B
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pollen grains

Exine in pollen grain in made up of

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

Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

Identify the pair of wrong statements I. Intine of pollen grains is made up of sporopollenin, II.l Pollen grains are well preserved as fossils because of the presence of sporopollenin, III. Enzymes can degrade the organic material of the pollen grain exine, IV. Sporopollenin can withstand high temperature, strong acids and alkali

The intine of pollen grains is composed of

Intine of pollen grain is made of

Pollen grain is

Pollen grain is

AAKASH INSTITUTE-SEXUAL REPRODUCTION IN FLOWERING PLANTS -Assignment (SECTION D)
  1. Exine of pollen grain

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  2. A: Each cell fo the sporogenous tissue is capable of giving rise to a ...

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  3. A: In sporoderm pecitocellulosic layer is surrounded by sproropolleni...

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  4. A: The gerative cell comes to lie freely in the cytoplasm of the tube ...

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  5. A: Restitutional nucleus can be observed in endothecium cells R: End...

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  6. A: chalazal vacuole is present in the help cell of embryo sac R: Pol...

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  7. A: Formatin of mature male gametophyte requires one meiotic and one mi...

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  8. A: filiform apparauts guides the pollen tube into the synergids R: I...

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  9. A: Geitonogamy helps in maintaining homozygosity and superiority of t...

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  10. A: Initial growth of pollen tube takes places on expenditure of food p...

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  11. A: Eight cells of octant stage in dicot embryogeny are made by 2 verti...

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  12. A: Triple fusion is associated with the sexual reproduction inall sper...

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  13. A: Anatropous ovule is resupinate ovule R: The body of ovule is comp...

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  14. A: More than one pollen tubes can enter an embryo sac R: Double fert...

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  15. A: hybird seed have to eb produced every year because seeds collected ...

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  16. A: Growth of male gametophyte is completed over the female reproductiv...

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  17. A: certain proteins of pollen orgin identifies the compatible stigam ...

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  18. A: Tetrapid gametophyte can be produced form tetraploid sporophyte by...

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  19. A: continued self pollination checks inbreeding depression R: pollen...

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  20. A: Complete radicle is not produced by hypobasal tier of octant embryo...

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  21. A: Apomicitic embryo is asexual mode of reproduction R: it prevents ...

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