List of top Science Questions on Control and Coordination

What is phototropism ?

How is the brain protected in our body?

The growth movements of plant parts in which the direction of the stimulus determines the direction of the response is known as tropic movements or tropism. Plants also have non-directional movements which may not be growth dependent.

In a nerve cell, the site where the electrical impulse is transmitted to the next neuron is called:

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.

Sense organ in which olfactory receptors are present is:

Select from the following a plant hormone which promotes cell division.

Where are auxins synthesized? How do they promote phototropism?

Name the part of the human brain which is responsible for the following actions:

1. Thinking
2. Blood pressure
3. Maintaining posture and balance
4. Salivation