Biology
When guard cells are flaccid, the stoma must be:
- Open
- Neither open nor closed
- Closed
- None of these
Transpiration
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Answer
Closed
Reason — When guard cells are flaccid, their inner wall is relaxed closing the stomata. Similarly, when the guard cells become turgid the inner wall is pulled outwards opening the stomata.
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Related Questions
Transpiration is significant for all except:
- Cooling effect
- Suction pull
- Ascent of sap
- Translocation of food
Hydathodes are located on:
- At the petiole
- Upper surface of leaves
- Lower surface of leaves
- Margins of leaves
Given below is a figure of a 'probable pathway of water through leaf cells during transpiration'. Before transpiration, certain processes occur in the cells like imbibition, evaporation, osmosis, diffusion, etc.
What will be the correct sequence for the processes A, B, C and D mentioned in the figure ?
- Imbibition, Osmosis, Diffusion, Evaporation
- Diffusion, Evaporation, Imbibition, Osmosis
- Evaporation, Diffusion, Osmosis, Imbibition
- Osmosis, Imbibition, Evaporation, Diffusion.
A certain process called "Guttation' occurs from the leaves of herbaceous plants.
(i) The exudate released during the process is water without mineral salts.
(ii) Guttation occurs when the 'rate of absorption' exceeds the 'rate of transpiration'.
(iii) It happens through the hydathodes of the leaves plants growing in warm humid conditions only.
(iv) Guttation is a kind of exudation which usually occurs during summer afternoons.
Which of the above statements with respect to this process are correct ?
- (i) and (ii)
- (ii) and (iii)
- (iii) and (iv)
- (iv) and (i)