Question

Mention the part of the brain which

(i) enables us to ride a bicycle

(ii) regulates peristalsis (3)

(b) Deficiency of hormone ‘X’ results in swelling of a gland present in the neck

region. This results in swollen neck. Identify the hormone ‘X’ and name the

mineral needed for production of this hormone in our body.

(c) What is chemotropism? Give an example

Answer 1

b)x is iodine n mineral is iodised salt
c)the growth of a plant towards chemical n e.g. is growth of sperm towards ovum
a)hind brain

Answer 2

Necessary brain parts for the following circumstances:

(i) enables us to ride a bicycle

Ans: Cerebellum.

(ii) regulates peristalsis

Ans: Hypothalamus.

b)Deficiency of hormone ‘X’ results in swelling of a gland present in the neck region. This results in swollen neck.The hormone 'X' is actually,'Thyroid' hormone.

Iodine is necessary for thyroid production.

The chemical caused plant growth is known as the "Chemotropism."

It is mainly seen in the fungi and some bacterial plants.