Question 21 of 25intermediate💡 UnderstandShort Answer3 marks

How does chemical coordination occur in plants?

Correct Answer

Plants do not have a nervous system or muscles like animals. Instead, chemical coordination in plants occurs through hormones. These hormones are produced in one part of the plant and move to another part to achieve the desired effect.

For example, when plants detect light, the hormone auxin is synthesized at the shoot tip. It diffuses towards the shady side and stimulates cells to grow longer, causing the plant to bend towards light. Other hormones like gibberellins help in stem growth, cytokinins promote cell division, and abscisic acid inhibits growth.

Exercise: EXERCISES | Q: 8 | (Page Page 13)
For More Understanding

Explanation

The answer draws directly from the textbook context which explains that plants lack a nervous system and use hormones for coordination. The key concept is that hormones are produced in one part and move to another to achieve effects. The example of auxin and phototropism is explicitly detailed in the text, along with other hormones (gibberellins, cytokinins, abscisic acid) and their functions.

Solution Steps

  1. Step 1: State that plants lack nervous system and use hormones for coordination.

  2. Step 2: Explain how hormones work - produced in one part, move to another for desired effect.

  3. Step 3: Give specific examples of plant hormones and their functions from the text.

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