Why is the use of iodised salt advisable?

Iodised salt contains iodine which stimulates the thyroid gland to produce thyroxine hormone. This hormone regulates the metabolism of fats, carbohydrates and protein in the body. Deficiency of iodine in our diet can lead to a condition called goitre, which is characterised by enlargement of the thyroid gland and swelling of the neck.

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Long Answer Type Questions>Q 37

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Define thigmotropism. Give one example of thigmotropism.

Important Questions on Control and Coordination

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Long Answer Type Questions>Q 37

What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Multiple Choice Questions (MCQs)>Q 38

Which of the following is not a plant hormone?

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Multiple Choice Questions (MCQs)>Q 39

One of the following plant hormones is responsible for the phenomenon of phototropism in plants. This is

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Multiple Choice Questions (MCQs)>Q 40

The movement of a plant part in response to the force of attraction exerted by the earth is called

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Multiple Choice Questions (MCQs)>Q 41

The movement of sunflower in accordance with the path of the sun is due to

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Multiple Choice Questions (MCQs)>Q 42

The plant part which exhibits negative geotropism is

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Multiple Choice Questions (MCQs)>Q 43

A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to

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Science for Tenth Class Part - 3 Biology>Chapter 2 - Control and Coordination>Multiple Choice Questions (MCQs)>Q 44

Which of the following is not caused by a growth movement?