Control and Coordination — Class 10 Science PYQs

In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as :

Select out of the following a gland which does NOT occur as a pair in the human body :

(A) (i) Write the significance of peripheral nervous system in human beings.
(ii) How is human brain protected from mechanical injuries and shocks ?

OR

(B) Name one directional growth movement each in response to chemicals and water in plants. Write an example for each of them.

(A) In which region of the brain is (i) medulla and (ii) cerebrum located ? State one function of each.
OR
(B) Name a hormone that promotes the growth of tendrils and explain how they help a pea plant to climb up other plants.

Define reflex action. With the help of a flow chart show the path of a reflex action such as sneezing.

(a) (i) Distinguish between hormonal co-ordination in plants and animals.
(ii) Which part of the brain is responsible for -
(1) intelligence
(2) riding a bicycle
(3) vomiting
(4) controlling hunger
(iii) How is brain and spinal-cord protected against mechanical injuries ?

OR

(b) (i) What are tropic movements ? Give an example of a plant hormone which (1) inhibits growth and (2) promotes cell division.
(ii) Explain directional movement of a tendril in pea plant in response to touch. Name the hormone responsible for this movement.

(a) (i) Distinguish between hormonal co-ordination in plants and animals.
(ii) Which part of the brain is responsible for –
(1) intelligence
(2) riding a bicycle
(3) vomiting
(4) controlling hunger
(iii) How is brain and spinal-cord protected against mechanical injuries ?

OR

(b) (i) What are tropic movements ? Give an example of a plant hormone which (1) inhibits growth and (2) promotes cell division.
(ii) Explain directional movement of a tendril in pea plant in response to touch. Name the hormone responsible for this movement.