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[A]: The two sperms cells in a pollen tu...

[A]: The two sperms cells in a pollen tube often change their shape.
[R]: The sperms are released in the synergid as intact cells but only their nuclei migrate

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
B
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[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

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[A]: Choroid plexus is one of two thin-walled greatly folded highly vascular regions in the inner wall of the brain through which ex- change of materials between blood and cerebrospinal fluid takes place. [R]: The choroid plexuses (which form the blood-brain barrier) bar the entry of blood cells and large molecules into the cerea brospinal fluid.

X is a human being with the reproductive oval shaped almond sized organ Y which releases mature gamete Z monthly once that goes into tube like structure A where it fuses with another gamete called B to form a new cell C. This cell C divides vigorously to form a ball of cells D which gets embedded in the thick lining of organ E of the reproductive system of X where it grows and develops into a foetus. i] Identify X, as male or female. ii] Name the reproductive part Y and give its two functions. iii] Name the gametes Z and B. Iv] Name the process which leads to the formation of C and Identify C. v] Name the ball of cells D. vi] Identify the organ E.

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TRUEMAN BIOLOGY-Plant Morphology & Reproduction -ASSERTION AND REASON
  1. [A]: The three cells of the egg apparatus are arranged in a triangular...

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  2. [A]: Pollen grains from male parent are mostly transferred to the stig...

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  3. [A]: The two sperms cells in a pollen tube often change their shape. ...

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  4. [A] : Synandrous condition is found in curcurbits. [R] : The male fl...

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  5. [A]: In certain plants the stem that twins around the support is hard ...

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  6. [A]: Leaf in Daucus carota is decompound. [R]: Saprophytic and paras...

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  7. [A]: The colour of flowers in Bougainvillia is due to the coloured bra...

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  8. [A]: The endosperm contains the triploid number of chromosomes. [R]:...

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  9. [A]: Spore mother cells within the anther pollen sacs form four haploi...

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  10. [A]: One diploid embryo sac mother cell develops within the nucellus o...

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  11. [A]: Triple fusion results in veg~tative fertiliza- tion of angiosperm...

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  12. [A]: Pollination is essential for fertilization. [R]: Abscission or...

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  13. [A]: The biennial plants live for two years. [R]: They flower in bo...

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  14. Assertion : Many visitors to the hills suffer from skin and respirator...

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  15. [A]: Endosperm is tripolid in angiosperms. [R]: In gymnosperms, it ...

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  16. Assertion. A pollen grain of angiosperm is considered as the male game...

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  17. The number of antipodals cells in the matured embryo sac is

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  18. Assertion : In collateral vascular bundles phloem is situated toward ...

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  19. [A]: The secondary pholem consititutes a less poriment part of the tre...

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  20. [A] : The narrow band of meristemetic tissue present between pholem an...

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