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Which hormone is primarily involved in regulating stomatal closure?

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Question: Which hormone is primarily involved in regulating stomatal closure?

Options:

  1. Auxin
  2. Gibberellin
  3. Abscisic acid
  4. Cytokinin

Correct Answer: Abscisic acid

Solution: 

Abscisic acid is the hormone that signals stomata to close in response to water stress, reducing water loss.

Which hormone is primarily involved in regulating stomatal closure?

Practice Questions

Q1
Which hormone is primarily involved in regulating stomatal closure?
  1. Auxin
  2. Gibberellin
  3. Abscisic acid
  4. Cytokinin

Questions & Step-by-Step Solutions

Which hormone is primarily involved in regulating stomatal closure?
Correct Answer: Abscisic acid
  • Step 1: Understand what stomata are. Stomata are tiny openings on the surface of leaves that allow gas exchange.
  • Step 2: Learn why stomata need to close. Stomata close to prevent water loss, especially during dry conditions.
  • Step 3: Identify the hormone involved. The hormone that helps in closing the stomata is called abscisic acid.
  • Step 4: Know when abscisic acid is released. It is released when the plant experiences water stress, like when the soil is dry.
  • Step 5: Understand the effect of abscisic acid. When abscisic acid is present, it signals the stomata to close, reducing water loss.
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