NCERT Class 10 Chapter 6 Control and Coordination CBSE Board Sample Problems Short Answer

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Question

In figure A, B and C, which appears more accurate and why

Solution

A; as shoot is showing phototropism i.e. growth of shoot towards the light and root is showing geotropism i.e. growth of root towards the gravity.

Question

Define neurons and identify the parts of a neuron at which information is transmitted to another neuron.

Solution

The structural and functional units of nervous system are called neurons. These are specialized units for acceptance and transmission of impulse to and fro between the brain and other body parts; nerve ending is the site of transmission.

Question

Read the functions of the following plant hormones and name them -

a) Promote cell enlargement and cell differentiation and promote fruit growth.

b) Promote cell enlargement, cell differentiation in presence of auxins and help in breaking the dormancy in seeds and buds. _____________________________

C) Promote cell division, promote opening of stomata and also fruit growth, help in breaking the dormancy of seeds and buds, delay the ageing in leaves._______________

d) Promote the dormancy in seeds and buds, promote the closing of stomata and falling of leaves. _________________

Solution

• Auxins

• Gibberellins

• Cytokinin

• Abscisic acid

Question

Label the parts to show the direction of flow of electric signals in the figure.

Solution

• Receptors

• Sensory neuron

• Spinal cord

• Motor neuron

• Effectors muscles

Question

Match the following:

Solution

Question

Pancreas is an example of a Heterocrine gland. Justify.

Solution

Heterocrine glands release their secretions both in the blood [hormones] and ducts [digestive juices]. As pancreas releases hormones (insulin & glucagon in blood) and pancreatic juice in pancreatic duct, it’s a Heterocrine gand.

Question

Draw a neat diagram of a neuron and label the following:

(i) Part where information is first received.

(ii)Part through which it travels.

(iii)Part through which ¡t ¡s released

Solution

(I) Dendrite

(ii) Axon

(iii) Axon terminal/Nerve ending

Question

a) The stimulus in blooming of flowers and a sunflower aligning itself in direction of sunlight is light. Then how are these movement different from each other.

(1+1)

b) What type of movement do roots exhibit?

(1)

Solution

a) Any 2 points

(1+1)

Blooming of flowers

1. Nastic Movement

2. Non directional movement

3. Growth independent movement

Sunflower aligning itself in direction of sunlight

Tropic movement

Directional movement

Growth dependent movement

b) -ve phototropism/ +ve Geotropism

(1)

Question

Study the Blood test report of a patient and answer the following questions

What do you Analyse from this blood test report?

Which gland secretes thyroxine and TSH hormone?

What do you think the doctor would suggest to the patient?

Solution

TSH level is high and thyroxine level is low (1)

Thyroid gland secretes Thyroxine and Pituitary gland secretes TSH hormone

(O. 5+0.5)

The doctor would suggest iodine rich diet. (1)