List of top Science Questions on Control and Coordination

Describe the structure of a Neuron and explain Reflex Action.

Define the S.I. unit of electric current.

Human brain has various parts or regions that help in different actions, responses and coordination. From the following, identify the part responsible for precision of voluntary actions :

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.

Name the plant growth hormone which is synthesized at the shoot tip. Explain why the shoot of a potted plant bends towards light coming from a window.

Name the (i) hormone released, and the (ii) gland which secretes it in human beings during scary situations. Explain how our body responds to enable it to deal with such situations.

Name the organ/part of a plant which shows:

1. Positive hydrotropism
2. Positive phototropism
3. Negative geotropism
4. Positive chemotropism

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

Where are auxins synthesized? How do they promote phototropism?

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

Sense organ in which olfactory receptors are present is:

(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.

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

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

How does the central nervous system communicate with other parts of the body to carry out various activities? Name two components of this system.

Which part of the brain is involved in activities like (i) picking a pencil and (ii) vomiting? State whether these actions are voluntary or involuntary.

Write the main functions of (i) sensory neuron and (ii) motor neuron in a reflex arc.

How is the brain protected from shocks and injuries?