What advanced conclusion about plant growth follows from the roles of gibberellin and cytokinin?
Answer and explanation
Correct answer: Growth is affected by separate controls of cell division and cell elongation
The governing concept is hormonal coordination of plant growth. Gibberellins promote processes such as stem elongation, whereas cytokinins stimulate cell division and support the formation of new cells. Comparing these roles shows that growth is not one single process controlled by one substance; it involves coordinated regulation of both cell division and cell elongation. Hence option A is correct. The other choices wrongly invoke animal nerves, deny chemical regulation, or misidentify plant hormones as human blood hormones.
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What is the correct answer to this question?
Growth is affected by separate controls of cell division and cell elongation
Why is this the correct answer?
The governing concept is hormonal coordination of plant growth. Gibberellins promote processes such as stem elongation, whereas cytokinins stimulate cell division and support the formation of new cells. Comparing these roles shows that growth is not one single process controlled by one substance; it involves coordinated regulation of both cell division and cell elongation. Hence option A is correct. The other choices wrongly invoke animal nerves, deny chemical regulation, or misidentify plant hormones as human blood hormones.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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