Grass leaves curl inwards during very dry weather. Select the mos

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 Multiple Choice QuestionsMultiple Choice Questions

101.

When a molecule moves across a membrane independent of other molecules the process is called

(i) Uniport

(ii) Symport

(iii) Antiport

  • (i) only

  • (i) and (ii) only

  • (i) and (iii) only

  • (ii) and (iii) only

  • (ii) and (iii) only


102.

Apopalstic movement of water occurs exclusively through the

(i) Intercelluar spaces

(ii) Walls of the cells

(iii) Plasmodesmata

(iv) Cytoplasm

  • (i), (ii) and (iv) only

  • (iii) and (iv) only

  • (i) and (ii) only

  • (ii) and (iv) only

  • (ii) and (iv) only


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103.

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following

  • flaccidity of buliform cells

  • shrinkage of air spaces in spongy mesophyll

  • tyloses in vessels

  • closure of stomata


A.

flaccidity of buliform cells

Buliform cells become flaccid due to water loss. This will make the leaves to curl inward to minimise water loss.


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104.

What is the direction of movement of sugars in phloem?

  • Upward

  • Downward

  • Bi-directional

  • Non-multidirectional


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