NCERT Class X Science Class: Chapter –7. Control and Coordination – Part-8

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Question 38:

Label the parts of a neuron in Figure.

Image the parts a,b,c,d of a neuron

Image the Parts a,B,C,D of a Neuron

Image the parts a,b,c,d of a neuron

Answer:

Image the parts of a neuron

Image the Parts of a Neuron

Image the parts of a neuron

Question 39:

Match the terms of Column (A) with those of Column (B)

Match the Terms of Column (A) with Those of Column (B) (Q)
Match the terms of Column (A) with those of Column (B) (Q)

Column A

Column B

A

Olfactory receptors

i

Tongue

B

Thermo receptors (temperature receptors)

ii

Eye

C

Gustatoreceptors

iii

Nose

D

Photoreceptors

iv

Skin

Answer:

Match the Terms of Column (A) with Those of Column (B) (A)
Match the terms of Column (A) with those of Column (B) (A)

Column A

Column B

A

Olfactory receptors

iii

Nose

B

Thermo receptors (temperature receptors)

iv

Skin

C

Gustatoreceptors

i

Tongue

D

Photoreceptors

ii

Eye

Question 40:

What is a tropic movement? Explain with an example.

Answer:

The directional growth movements of plants due to external stimuli are called tropic movement. It can be either towards the stimulus, or away from it. For example, in case of phototropic movement, shoots respond by bending towards light while roots respond by bending away from it.

Image the tropic movement

Image the Tropic Movement

Image the tropic movement

Question 41:

What will happen if intake of iodine in our diet is low?

Answer:

(a) When iodine intake is low, release of thyroxin from thyroid gland will be less by which protein, carbohydrate and fat metabolisms will be affected.

(b) A person might suffer from goiter in case of iodine deficiency in the body.

Image the cause of goiter

Image the Cause of Goiter

Image the cause of goiter

Question 42:

What happens at the synapse between two neurons?

Answer:

When an electrical signal reaches the axonal end of one neuron it releases certain chemical substances that cross the synapse and move towards the dendritic end of next neuron generating another electrical signal.

Image the synapse between two neurons

Image the Synapse between Two Neurons

Image the synapse between two neurons