Identify $X$ and $Y$ from the figure.

  • A
    $X=$ Guard cell,$Y=$ Stomatal aperture
  • B
    $X=$ Microfilaments,$Y=$ Guard cell
  • C
    $X=$ Subsidiary cell,$Y=$ Microfilaments
  • D
    $X=$ Guard cell,$Y=$ Microfilaments

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Concentration of $CO_2$ from nature which is able to induce closure of stomata is

The process by which plants lose water in liquid form is called $P$,while the process by which plants lose water in the form of vapor is called $Q$.

What is the stomatal apparatus? Explain the structure of stomata with a labelled diagram.

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Assertion : Light is a very important factor in transpiration.
Reason : Light induces stomatal opening and darkness closing of stomata. Therefore,transpiration increases in light and decreases in dark.

The opening and closing of stomata are caused by:

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