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प्रश्न
Very short answer question.
Why do diurnal changes occur in osmotic potential of guard cells?
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उत्तर
1. According to Steward, diurnal changes occur in the osmotic potential of guard cells due to starch-sugar inter-conversion.
2. Whereas according to Levitt active transport of potassium ions into the guard cells and out of them causes diurnal changes in the osmotic potential of guard cells.
3. Endo-osmosis and exo-osmosis occur due to diurnal changes in osmotic potential of guard cells.
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संबंधित प्रश्न
Explain the root pressure theory.
Why is transpiration is called ‘a necessary evil’?
What is transpiration?
Guard cells differ from epidermal cells in having
Give an example of plant having both kidney and dumb-bell shaped guard cells in stomata.
Sketch and label - structure of stomata[ apparatus.
Match the columns:
| Column A (Scientist) | Column B (Theory) | ||
| (1) | Dixon and Joylly | (a) | Starch-sugar inter-conversion theory |
| (2) | Steward | (b) | Osmotic absorption theory |
| (3) | Atkins and Pristley | (c) | Non-osmotic absorption theory |
| (4) | Kramer and Thimann | (d) | Cohesion tension theory |
What are the limitations of root pressure theory?
In plants, active absorption usually does NOT occur when ______.
Аccessory cells of stomata are reservoirs of ______.
