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A: filiform apparauts guides the pollen ...

A: filiform apparauts guides the pollen tube into the synergids
R: It is special cellular thickening at microplylar tip to secrete chemotorpic stimulus

A

if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark

B

if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark

C

if assertion is true statement but reason is false then mark

D

if both assertion and reason are flase statements then mark

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The correct Answer is:
A
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" The synergids have special cellular thicknings at the micropylar tip called "

The structures which guide the pollen tube into synergid is

Synergids have special cellular thickening at micropylar tip. Write the name and function of this structure

Which structure of synergid attracts pollen tube towards itself by secreting chemotropic substance ?

[A] : Synergids play an important role in directing the pollen tube growth . [R] : Because synergids secrete some chemotropically active substance .

Special cellular thickenings are observed at the micropylar end of the synergids. Identify the option which correctly identifies these structures and their function.

This section contains Assertion (A) and Reason (R) type questions. Each question has choices (1), (2), (3) and (4), out of which only one is correct. Assertion (A) Synergids of embryo sac help in fertilisation in angiosperms. Reason (R) Filiform apparatus of synergids secrete certain chemotropically active substance due to which pollen tube grows towards the embryo sac.

[A]: The three cells of the egg apparatus are arranged in a triangular fashion. [R): The degenerating synergid forms the seat for pollen tube discharge in the embryo sac

AAKASH INSTITUTE-SEXUAL REPRODUCTION IN FLOWERING PLANTS -Assignment (SECTION D)
  1. A: Each cell fo the sporogenous tissue is capable of giving rise to a ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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