Rhythmic opening and closing of the stomata is controlled by _.
Correct answer: D. Internal clock in guard cells
- A. Temperature
- B. Oxygen
- C. Transpiration
- D. Internal clock in guard cells
Explanation
Option D is correct since the daily rhythmic opening and closing of 'stomata' is due to an internal clock located in guard cells. Even if the plant is kept in a dark closet, stomata will continue their daily rhythm of opening and closing.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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