Advertisements
Advertisements
प्रश्न
Very short answer question.
Why do diurnal changes occur in osmotic potential of guard cells?
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.
APPEARS IN
संबंधित प्रश्न
What is dark reaction in photosynthesis?
Describe C3 Pathway.
Describe the mechanism of opening and closing of stomata.
Answer the following question.
Explain the role of transpiration.
Why is transpiration is called ‘a necessary evil’?
Answer the following question.
What is the significance of transpiration?
Which of the following term correctly describes the membrane which allows passage of certain substances more readily than others?
Give an example of plant having both kidney and dumb-bell shaped guard cells in stomata.
Sketch and label: types of guard cells
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 |
