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[A]: Plants growing under trees show les...

[A]: Plants growing under trees show less photosynthesis.
[R]: Green light is least effective in photosyn- thesis.

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:
A
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Blue and red light are equally effective in photosynthesis but blue light is less efficient because

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Each of these questions has an Assertion (A) and a Reason (R). Assertion (A) Plants convert light energy into chemical energy during the process of photosynthesis. Reason (R) Sugar produced from photosynthesis by plants is used by human beings as a source of energy

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Root pressure is largely responsible for ascent of sap in harbace...

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  2. [A]: The nodulated bacteria fix nitrogen in the presence of leg Hb. ...

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  3. [A]: Plants growing under trees show less photosynthesis. [R]: Gree...

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  4. [A]: Chlorophylls usually show red fluores- cence though they absorb b...

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  5. Asserion : Long distance flows of photoassimilates in plants occurs t...

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  6. [A]: Rhoea discolor leaves contain anthocya-nin in epidermal cells [...

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  7. [A]: Ringing/Girdling experiments involved removal of all tissues outs...

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  8. [A]: Action spectra for photosynthesis help to identify the pigments i...

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  9. [A] : C3 & C4 cycle can not occur in the same plant [R] : C3 cycle ...

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  10. [A]: Photosynthesis is an oxidation reduction process. [R]: Electron...

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  11. Assertion. Nitrogen deficiency induced purplish colouration in stems, ...

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  12. Asserotion: C(4) photosynthetic pathway is more efficient than the C(3...

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  13. Assertion. The atmospheric concentration of CO(2) at which photosynthe...

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  14. Assertion: Sigmoid growth curve consists of four parts. Reason : La...

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  15. [A] : 2,4-D is a herbicide [R] : It is not used during showing of cr...

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  16. [A] : Nastic movements occur in the directions of stimuls [R] : "Tou...

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  17. [A] : Germinating seeds which store fats as reserve food material are ...

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  18. [A] : Gibberellic acid , when added to isolated aleurone , induce amyl...

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  19. [A] : When apical bud is removed, the next axial bud begins to grow ou...

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  20. [A]: Xanthium will not flower if the long dark period is interrupted b...

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