NCERT Class 10 Chapter 6 Control and Coordination CBSE Board Sample Problems Short Answer
Doorsteptutor material for CBSE is prepared by world's top subject experts: fully solved questions with step-by-step explanation- practice your way to success.
Question
In figure A, B and C, which appears more accurate and why

In Figure a, B and C, Which Appears More Accurate
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.

The Direction of Flow of Electric Signals
Solution
Receptors
Sensory neuron
Spinal cord
Motor neuron
Effectors muscles
Question
Match the following:
1. Olfactory receptors | a. Tongue |
2. Thermo receptors | b. Eye |
3. Gustatoreceptors | c. Nose |
4. Photoreceptors | d. Skin |
Solution
1. Olfactory receptors | c. Nose |
2. Thermo receptors | d. Skin |
3. Gustatoreceptors | a. Tongue |
4. Photoreceptors | b. Eye |
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

Draw a Neat Diagram of a Neuron and Label
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

Study the Blood Test Report of a Patient and Answer
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)