CBSE Class 10 Biology Control and Coordination Worksheet Set A

Question. Which of the following acts as both endocrine and exocrine gland?
(a) Pancreas
(b) Thyroid
(c) Adrenal
(d) Liver

Answer : A

Question. Which of the following is not associated with growth of plant? 
(a) Auxin
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid

Answer : D

Question. A student accidentally places her hand on a flame of candle and quickly pulls her hand away. The flame represents
(a) a response
(b) a stimulus
(c) an impulse
(d) an effector

Answer : B

Question. How many pairs of cranial nerves are present in man?
(a) 12
(b) 21
(c) 31
(d) 41

Answer : A

Question. Main function of cerebrum is
(a) thinking
(b) hearing
(c) memory
(d) balancing

Answer : A

Question. Which endocrine gland is also known as ‘master gland’?
(a) Pancreas
(b) Adrenal
(c) Pituitary
(d) Hypothalamus

Answer : C

Question. The main function of abscisic acid in plants is
(a) to promote cell division.
(b) to inhibit growth.
(c) to promote growth of stem.
(d) to increase the length of cells.

Answer : B

Question. Fall of mature leaves and fruits from plants is triggered by which of the following substance?
(a) Auxin
(b) Cytokinin
(c) Gibberellin
(d) Abscisic acid

Answer : D

Question. Any change in the environment to which an organism responds is called
(a) stimulus
(b) coordination
(c) response
(d) hormone

Answer : A

Question. Which nerves transmit impulses from the cen¬tral nervous system towards muscle cells?
(a) Sensory nerves
(b) Motor nerves
(c) Relay nerves
(d) Cranial nerves

Answer : B

Question. A microscopic gap between a pair of adjacent neurons over which nerve impulses pass is called
(a) neurotransmitter
(b) dendrites
(c) axon
(d) synapse

Answer : D

Question. Movement of sunflower in accordance with the path of Sun is due to
(a) Chemotropism
(b) Geotropism
(c) Phototropism
(d) Hydrotropism

Answer : C

Question. The highest coordinating centre in the human body is
(a) spinal cord
(b) heart
(c) brain
(d) kidney

Answer : C

Question. Which of the following statements is correct about receptors? 
(a) Gustatory receptors detect taste while olfactory receptors detect smell
(b) Both gustatory and olfactory receptors detect smell
(c) Auditory receptors detect smell and olfactory receptors detect taste
(d) Olfactory receptors detect taste and gustatory receptors smell

Answer : A

(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.

Question. Assertion: Brain is a delicate organ which is protected from injury.
Reason: The bony box protects the brain from any shock.

Answer : C

Question. Assertion: Plants do have a nervous system for control and coordination.
Reason: Plants use electro chemical means to convey information from cell to cell.

Answer : D

Question. Assertion: Reflex Arc works faster than thinking process of brain.
Reason: Reflex Arc works in case of those animals who donot have thinking process.

Answer: C

Question. Assertion: Impulse travels from dendrite to cell body and then along the axon to its end.
Reason: Information acquired at the end of the dendrite tip of a nerve cell sets of an electric impulse.

Answer : A

Question. Assertion: On attaining puberty, breast size increases and reproductive organs develop in females.
Reason: Ovaries release hormone proges-terone in female.

Answer : B

True and False :

Question. Plants coordinate their behaviour against environmental changes by using plant hormones. 
Answer: True

Question. The reaction to stimuli is a characteristic property of animals only.
Answer: False

Question. Iodine is essential for the synthesis of thyroxine. 
Answer: True

Question. The hormone which is associated with female puberty is called testosterone. 
Answer: False

Question. The job of the central nervous system is to collect all the information from all the receptors in our body 
Answer: True

Fill in the Blanks :

Question. Control and coordination are the functions of the nervous system and ……… in our body.
Answer: hormones

Question. The nervous system uses ……… impulses to transmit messages.
Answer: electrical

Question. The cells in our body that can be over a foot long are ____________ .
Answer: nerve cells

Question. The box enclosing the brain is called the ____________ .
Answer: cranium

Question. The lobes — parietal, temporal, frontal and occipital belong to ____________ .
Answer: cerebrum

Question. In a neuron, conversion of electrical signal to a chemical signal occurs at/in ____________ .
Answer: axonal end

AR TYPE QUESTIONS
Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question. Assertion(A): A growing plant appears to bend towards the direction of light
Reason (R) : The plant hormone auxin diffuses towards the shady side of the root.
Answer : A

Question. Assertion(A) : The brain is also known as the central nervous system.
Reason (R) : Central nervous system controls and regulates the voluntary actions.
Answer : D

Question. Assertion(A): The effect of auxin hormone on the growth of root is exactly opposite to that on a stem.
Reason (R) : Auxin hormone increases the rate of growth in root and decreases the rate of growth in stem
Answer : C

Question. Assertion(A) : Plants lack a nervous system, but they do coordinate.
Reason (R) : It is so because of hormones
Answer : A

Question. Assertion(A): A receptor is a specialized group of cells in a sense organ that perceive a particular type of stimulus.
Reason (R) : Different sense organs have different receptors for detecting stimuli.
Answer : B