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[A]: The pollen sterility has been attri...

[A]: The pollen sterility has been attributed to the malfunctioning of tapetum.
[R]: Premature degeneration of the tapetum deprives the developing spores of its nutri- tion.

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

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The correct Answer is:
A
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Management and conservation of natural resources means the scientific utilization of resources. This method yields the greatest sustainable benefit of available resources to the present generations, while maintaining its potential to meet the needs and aspirations of future generations. In recent years, it has been observed that most of our natural resources are being depleted. It is mainly due to the over exploitation of resources as a result of changing lifestyle, over population and technological development. Thus the need of the hour is to wisely manage our natural resources and minimize their wastage. For this, we should remember the 3 R's that can save environment. Which of these statements is incorrect about sustainable development ?

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Management and conservation of natural resources means the scientific utilization of resources. This method yields the greatest sustainable benefit of available resources to the present generations, while maintaining its potential to meet the needs and aspirations of future generations. In recent years, it has been observed that most of our natural resources are being depleted. It is mainly due to the over exploitation of resources as a result of changing lifestyle, over population and technological development. Thus the need of the hour is to wisely manage our natural resources and minimize their wastage. For this, we should remember the 3 R's that can save environment. Conservation is:

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TRUEMAN BIOLOGY-Plant Morphology & Reproduction -ASSERTION AND REASON
  1. Assertion. In apomixis , plants of new genetic sequence are produced. ...

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  2. [A]: Incompatibility is a gene physiological process. [R]: Moderate...

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  3. [A]: The pollen sterility has been attributed to the malfunctioning of...

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  4. [A]: The three cells of the egg apparatus are arranged in a triangular...

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

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

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

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

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

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

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

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

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

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

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

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

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  17. Assertion (A): Many visitors to the hills suffer from skin and respira...

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

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

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  20. Assertion. In apomixis , plants of new genetic sequence are produced. ...

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