If plants are grown without light, they become extremely long and fail to form chlorophyll. They are said to be:
Correct answer: D. Etiolated
- A. Callus
- B. Chlorotic
- C. Galls
- D. Etiolated
Explanation
Etiolation occurs when plants are grown in the absence of light or with insufficient light. As a result, the plants become pale, elongated, and weak, with poorly developed leaves. Etiolated plants also fail to form chlorophyll, which is necessary for photosynthesis.
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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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