Control and coordination NCERT solution

 Control and coordination NCERT solution

Question 1

Which of the following is a plant hormone?

a). Insulin

b). Thyroxine

c). Oestrogen

d). Cytokinin

Ans:- d) cytokinin

Question 2

The gap between two neurones is called a 

a). Dendrite

b). Synapse

c). Axon

d). Impulse

Ans:- (b) synapse

Question 3

The brain is responsible for

a). Thinking

b). Regulating the heartbeat

c). Balancing the body

d). All of the above

Ans:-(d) all of the above

Question 4

What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems likely to arise?

Ans:-

The receptors in our body collect information about changes within the environment around us within the sort of stimuli i.e, photoreceptors, gustorecepters. This receptors then passes the data within the type of electrical discharge to central system where message is interpreted and appropriate instructions are sent to effactors. When receptors don't function normally, the environmental stimuli aren't ready to create nerve impulses and body doesn't respond. for instance, if our the gustory receptors located within the tongue don't work properly we are going to not receive the taste of food like sour, bitter, sweet or salty.

Question 5

Draw the structure of a neurone and explain its function?

Ans:- The the primary dendrites receive the impulses from the opposite neurones nerve endings. Then the impulse is passes to cell body. afterward the impulse is passes from axon to nerve end, where dendrites of other neurons are attached. during this sequence the impulse is passes from one neuron to a different.

Question 6

How does phototropism occur in plants?

Ans:- The instant of plants or other organisms in response to light is termed phototropism. The movement can either be towards the sunshine or far from it. The stem grows indirection of the sunshine which is understood as positively phototropism and roots grow aloof from it. the expansion is controlled by the growth regulator auxin. the expansion of the side of the suit is stimulated by the concentration of auxin. The bending of the stem is caused by unequal growth on the 2 sides of the shoot. Phototropic movement is mostly caused by the increased auxin on the dark side and lesser auxin on the illuminated side.

Question 7

Which signals will get disrupted in case of spinal cord injury?

Ans:- Just in case of a medulla spinalis injury, reflex actions and involuntary actions will get disrupted.

Question 8

How does chemical coordination occur in plants?

Ans:- In plants, chemical coordination occurs with the assistance of plant hormones called phytohormons. Different plant hormones help to co-ordinate growth, development and responses to the environment. they're synthesized at places far from where they act and easily diffuse to the world of action, for instance of auxin. Another example of plant hormones are Gibberlins which help in growth of the stem. Cytokinins promote organic process, abscisic acid could be a plant product which inhibits growth and its effects include wilting of leaves.

Question 9

What is the need for a system of control and coordination in an organism?

Ans:- The the body of a multicellular organism consists of variety of components and sub components and every is specialized to perform a specific function. Therefore it's necessary that various organ of the body of an organism work together in a very proper manner to hold out various functions and reply to stimuli.

Question 10

Compare and contrast nervous and hormonal mechanisms for control and coordination.

Ans:-

Nervous control

• Information is passed as electrochemical conduction.

• • information travels rapidly in milliseconds.

• response is immediate.

• • it's affects are short- lived.

Hormonal control

• information is shipped as a chemical substance through the blood stream.

• • information travels slowly.

• response is sometimes slow.

• • it is a facts are generally more prolonged.

Question 11.

How are involuntary actions and reflex actions different from each other?

Ans:-

Involuntary action

• they involve automatic system.

• • day usually occur in response to internal stimuli.

• they're connected with functioning of internal body parts.

• • these are regulated by medulla this can be an element of hindbrain.

• the speed of responses is slower.

• Reflex action

• • they involve all parts of voluntary systema nervosum.

• they operator against harmful stimuli and are external.

• • they're connected with emergency.

• reflex action is controlled by a neural structure.

• • the speed of response is extremely fast.

Question 12

What is the differences between the manner in which movement takes place in a sensitive plant and the movement in our legs?

Ans:- 

Movement in sensitive plant

• in response to an external stimulus like touch and shock.

• plant cells change safe by changing the quantity of water.

• no nerves are involved

• Moment in our legs

• It occurs In response to our requirement and is decided by our will.

• moment in our legs may be a voluntary action which is controlled by cerebellum in hindbrain.

• • nerves carry the message to maneuver legs.

Also Read:-

Control and coordination class 10 notes

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