Q3 of 36 Page 261

What does CNS stand for?

CNS stands for Central Nervous System. It includes brain and spinal cord.


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3

A. Name the hormones secreted by the following endocrine glands:

(i) Thyroid gland


(ii) Parathyroid glands


(iii) Pancreas


(iv) Adrenal glands


B. Write the functions of testosterone and estrogen hormones.

 3

A. Write the names of the regions of hind-brain. Give functions of each region.

B. Mention the functions of cerebrum.

 4

A. What is meant by ‘tropisms’ ? Explain with an example.

B. Mention types of tropisms. Define each type of tropism. Write the name of stimulus in each case.


C. How do tropism differ from nastism?

 4

A. Define phototropism and give one example of it.

B. How does phototropism occur in a plant stem ? Explain with the help of labelled diagrams.


C. What is meant by positive phototropism and negative phototropism? Give one example of each type.