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[A]: Wax, resin and suberin coating on t...

[A]: Wax, resin and suberin coating on the surface of plant parts reduce the rate of tran- spiration.
[R]: These adaptations are found mostly in xerophytes.

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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Assertion:Waxy and cutin coating on plant parts reduce the transpiration. Reason:These adaption are found in xerophytes.

Some experiments were carried out using Croton sp. plants to understand the process of photosynthesis. It was observed that the leaves of the plant exposed to light for longer duration accumulated more starch. However, due to presence of pre-formed starch in the leaves, it was difficult to find the net productivity on a fixed exposure to light source. Therefore, it was necessary to obtain starch free leaves in the plant before starting the experiment. Some of the starch free leaves were coated with wax on both the surfaces. The plant was maintained under normal environmental conditions. At the end of the experiment, the wax coated leaves are likely to show _________.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Rhizobial aggregates have been ob- served at distinct sites on cu...

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  2. [A]: Light is very important external factor of transpiration. [R]:...

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  3. [A]: Wax, resin and suberin coating on the surface of plant parts redu...

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  4. [A]: Gibberellic acid when added to isolated aleurone layer, induces a...

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  5. Assertion : Auxillary buds, in actively growing herbaceous plants, gen...

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  6. Assertion : If you burn a plant , its nitrogen component is given of...

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  7. [A]: Amino acids are converted into ammonia by a group bacteria called...

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  8. [A]: Due to excessive use of fertilizers, the available water to the p...

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  9. [A]: Vernalization is also called as yarovization. [R]: In short day...

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  10. [A]: Fundamental factor in the vernalization is low temperature. [R...

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  11. [Aj: ABA plays an important role in plants during water stress and dro...

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  12. (A]: Cytokinins help in retention of cholorophyll and delayed senescen...

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  13. [A]: The germination of lettuce seeds is stimulated by red light and i...

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  14. [A]: The far-red form of the phytochromes ab- sorb light at 740 nm. ...

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  15. [A]: Elongation and division of cells are pro- moted by gibberellins. ...

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  16. [A]: Senescence effect can be reversed by cytokinin. [R]: The loss ...

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  17. [A]: Wilting occurs due to loss in turgidity. [R]: Turgor pressure c...

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  18. [A]: Plasmolysis is seen by both living and dead cells. [R]: Both ty...

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  19. [A]: The water is absorbed by the root and moves into the stem. [R]...

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  20. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

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