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A: Formatin of mature male gametophyte r...

A: Formatin of mature male gametophyte requires one meiotic and one mitotic division in 60% of the anglosperms
R: Pollination occurs in three celled conditon in majority of angiosperms

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 true 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

Text Solution

Verified by Experts

The correct Answer is:
D
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Given below are four statement (A-D) each with one of two blanks .Select the option which correctly fill up the blanks in two statements A The human male ejaculates about (i) million sperms during a cooitus . Out of which for normal fertility at teast (iii) percent sperms must have normal shape and size B. A primary spermatocyte completes (i) meiotic division leading to the formation of two equal haploid cells called (i) C. Spermatogenesis starts at the age of (i) due to significant increase in the secretion of (ii) a hypothalamic hormone D. Oogenesisi is initiated during embryonic development and at puberty only (i) primary follicles are left in each overy

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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