Which of the following statements is not true for stomatal apparatus?

  • A
    Guard cells invariably possess chloroplasts and mitochondria.
  • B
    Guard cells are always surrounded by subsidiary cells.
  • C
    Stomata are involved in gaseous exchange.
  • D
    Inner wall of guard cells are thick.

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If the rates of transpiration and water absorption of a flowering plant are measured over a period of $24$ hours,it is found that the rate of transpiration reaches its peak at about mid-day and then declines,whereas the peak for water absorption is reached approximately two hours later. Which one of the following statements provides the best explanation of these results?

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Which of the following conditions may be favourable for the wide opening of stomata?

Which of the following is not related to the structure of stomata?

The stomatal apparatus consists of:

The opening and closing of stomata takes place as a result of active transport of . . . . . . ions in guard cells.

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