Q3 of 36 Page 261

A. What is a spinal cord? What is its main function?

B. Give the functions of medulla oblongata.

(A) Spinal cord is a cylindrical structure which originates from the posterior extension of medulla oblongata( a part of hind brain). Function- It contain nerve fibres which help in the transfer of information from spinal cord to brain (known as ascending nerves) and from brain to spinal cord(known as descending brain).

(B) Function of medulla- It controls various involuntary activities like breathing, heartbeat, peristalsis movement of alimentary canal, blood pressure.


It also controls the main centre of reflex action like coughing, sneezing, vomiting, etc.


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B. What does a stem do in response to light? What is this phenomenon known as?

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A. What does a stem do in response to gravity? What is this phenomenon known as?

B. What does a root do in response to light? What is this phenomenon known as?

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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.