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What is the importance of potassium in t...

What is the importance of potassium in the opening and closing of stomata?

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Accumulation of K in guard cells in light increases the asmotic potential of the guard cells, this causes opening of stoma. In dark, K moves out of the guard cells and their osmotic potential becomes less negative. Thus water osmoses out of the guard cells and their turgidity decreases. This causes stomatal closure.
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ICSE-TRANSPORT IN PLANTS -TEST YOUR PROGRESS (VERY SHORT ANSWER TYPE QUESTIONS)
  1. A plant cell when kept in a certain solution got plasmolysed. What was...

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  2. Name the vital theory proposed by Sir J.C. Bose for ascent of sap.

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  3. What is the importance of potassium in the opening and closing of stom...

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  4. Define wall pressure.

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  5. How can you revert a freshly plasmolysed plant cell to its normal stat...

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  6. A plant cell is kept in a hypotonic solution. What will happen to the ...

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  7. Mention the most significant function/role of guard cells in plants.

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  8. Why do plant cells not burst when placed in water?

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  9. Name the best known contribution of Sir J. C. Bose.

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  10. What would happen if a plasmolysed cell is kept in pure water?

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  11. Elaborate the abbreviation "OP"

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  12. Elaborate the abbreviation "DPD"

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  13. Explain why salt is added in excess to pickles

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  14. Jamming of wooden doors and windows takes place during rainy season. G...

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  15. Give the scientific term for the specialised structure through which g...

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  16. State the most significant contribution of Dixon and Jolly:

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  17. A cut plant wilts fast even if its cut end is dipped in water.

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  18. What will happen if excess fertilizers are added to soil?

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  19. Give a scientific term for The hydrostatic pressure developed insid...

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  20. What are porins?

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