CBSE Class 10 Biology Control and Coordination MCQs Set B

Answer : D

Answer : D

Question. People suffering from diabetes mellitus are unable to secrete sufficient     
(a) insulin
(b) adrenaline
(c) thyroxine
(d) testosterone 
Answer:   A

Question. The root of a plant is     
(a) positively geotropic
(b) positively phototropic
(c) negatively geotropic
(d) positively thigmotropic
Answer:   A

Question. The response of plant parts towards light is called      
(a) geotropism
(b) phototropism
(c) hydrotropism
(d) chemotropism
Answer:   B

Question. Reflex action is controlled mainly by the     
(a) brain
(b) autonomous nervous system
(c) peripheral nervous system
(d) spinal cord
Answer: D

Question. The master gland of the body is the     
(a) testis
(b) pituitary
(c) thyroid
(d) adrenal
Answer: B

Question. The activities of the internal organs are controlled by     
(a) the reflex arc
(b) the peripheral nervous system
(c) the autonomic nervous system
(d) none of these
Answer:  C

Question. The plant hormone essential for cell division is    
(a) abscisic acid
(b) auxin
(c) gibberellin
(d) cytokinin
Answer: D

Question. The junction between two neurons is called      
(a) synapse
(b) dendrite
(c) joint
(d) axon
Answer: A

Question. Which of these plant hormones is a growth inhibitor?     
(a) Gibberellin
(b) Auxin
(c) Abscisic acid
(d) Cytokinin
Answer: C

Fill in The Blank

Question. A feedback mechanism regulates the action of the .......... .
Answer: hormones

Question. An axon terminal passes the electrical stimulus to a dendrite of next neuron through .......... reaction.
Answer: chemical

Question. Motor nerves transmit response from ......... organs to ......... nervous system in the form of impulse.
Answer: sensory, central

Question. .......... hormone is applied to cuttings to induce root initiation in horticulture.
Answer: Auxin

Question. A hormone is a chemical secreted by an .........
Answer: endocrine gland

Question. Positive geotropism of root is due to greater growth on .......... side as compared to .......... side.
Answer: upper, lower

Question. The initial depolarization of the nerve cell membrane.
Answer: sodium

Question. .......... performs control and coordination in plants.
Answer: Phytohormones

Question. The .......... of the neuron secretes the neurotransmitter substance.
Answer: axon

Question. The response of a plant to a stimulus of water is called .........
Answer: hydrotropism

Question. .......... hormone increases heartbeat rate when we get a fright.
Answer: Adrenalin

Question. Apical dominance - Auxin; reversal of dwarfism ..........
Answer: GA

True/False

Question. Blue light effective in phototropism.
Answer: True

Question. From a functional perspective, the nervous system provides slow, long-term coordination.
Answer: False

Question. One-celled organisms can respond to stimuli.
Answer: True

Question. The main thinking part of brain is hind brain.
Answer: False

Question. The nervous system is closely associated with every system in your body.
Answer: True

Question. Auxin ‘b’ isolated from corn germ oil.
Answer: True

Question. The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
Answer: True

Question. Growth hormone is secreted by adrenal gland.
Answer: False

Question. Functioning of various organs in uniformity is called coordination.
Answer: True

Question. Centres of hearing, smell, memory, sight, etc., are located in fore brain.
Answer: True

Question. Bending of Tentacles in Drosera is Thigmonasty.
Answer: True

Question. Sudden action in response to something in the environment is called reflex action.
Answer: True

Question. Cerebellum does not control posture and balance of the body.
Answer: False

Assertion and Reason

DIRECTION : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.

Question. Assertion : Suppression of growth of auxiliary buds is called apical dominance.
Reason : It is due to effect of downward movement of Auxin from apical region towards the lower side.
Answer: A

Question. Assertion : Abscisic acid is responsible for wilting of leaves.
Reason : It is a growth inhibitor.
Answer: A

Question. Assertion : Unlike cabbage, sunflower plant has long internode with leaves that are far apart.
Reason : Sunflower produces sufficient amounts of Gibberellins during its growing period.
Answer: A

Question. Assertion : Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.
Reason : Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.
Answer: A

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

Question. Assertion : Phototropism is caused by auxin.
Reason : When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot.
Answer: A

Question. Assertion : Senescence is delayed by the application of cytokinin in plants.
Reason : Cytokinin prevents the breakdown of chlorophyll, proteins and nucleic acid.
Answer: A

Question. Assertion : Antheorozoids of Funaria show chemotropic movement.
Reason : This is a paratonic movement of locomotion.
Answer: A

Question. Assertion : Phototropism is a directional growth movement.
Reason : It occurs in the direction of light.
Answer: A

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