Online Test — Control and Coordination
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
A change in the environment to which an organism responds is a:
Response
Stimulus
Reflex
Hormone
Explanation: A stimulus is a change that an organism responds to.
Question 2 of 15
The structural and functional unit of the nervous system is the:
Neuron
Nephron
Alveolus
Synapse
Explanation: The neuron is the basic unit of the nervous system.
Question 3 of 15
The part of a neuron that receives impulses is the:
Axon
Dendrite
Cell body
Synapse
Explanation: Dendrites receive impulses; the axon carries them away.
Question 4 of 15
The microscopic gap between two neurons is the:
Synapse
Axon
Reflex arc
Nerve
Explanation: A synapse is the gap across which the impulse passes chemically.
Question 5 of 15
A reflex action is mainly controlled by the:
Cerebrum
Spinal cord
Cerebellum
Pancreas
Explanation: Reflex actions are controlled by the spinal cord for a quick response.
Question 6 of 15
The largest part of the human brain, responsible for thinking, is the:
Cerebellum
Medulla
Cerebrum
Pons
Explanation: The cerebrum (fore-brain) controls thinking, memory and voluntary actions.
Question 7 of 15
Balance and posture of the body are controlled by the:
Cerebrum
Cerebellum
Medulla
Spinal cord
Explanation: The cerebellum controls balance, posture and precise movements.
Question 8 of 15
Heartbeat and breathing are controlled by the:
Cerebrum
Cerebellum
Medulla
Dendrites
Explanation: The medulla controls involuntary actions like heartbeat and breathing.
Question 9 of 15
Plants coordinate their responses using:
A brain
Nerves
Chemical hormones
A spinal cord
Explanation: Plants have no nervous system; they coordinate using hormones.
Question 10 of 15
Roots growing downward into the soil is an example of:
Phototropism
Geotropism
Hydrotropism
Nastic movement
Explanation: Growth in response to gravity is geotropism (gravitropism).
Question 11 of 15
The plant hormone responsible for phototropism is:
Insulin
Auxin
Adrenaline
Thyroxine
Explanation: Auxin causes the shoot to bend towards light (phototropism).
Question 12 of 15
Endocrine glands secrete hormones directly into the:
Stomach
Blood
Lungs
Nerves
Explanation: Endocrine glands release hormones into the blood, which carries them to target organs.
Question 13 of 15
Insulin, which controls blood sugar, is secreted by the:
Thyroid
Pancreas
Adrenal gland
Pituitary
Explanation: Insulin is secreted by the pancreas; its deficiency causes diabetes.
Question 14 of 15
Goitre is caused by the deficiency of:
Iodine (for thyroxine)
Insulin
Auxin
Adrenaline
Explanation: Thyroxine needs iodine; lack of iodine causes goitre.
Question 15 of 15
Compared with nervous control, hormonal control is:
Faster but short-lived
Slower but longer-lasting
Exactly the same
Not used in the body
Explanation: Hormonal control acts more slowly than nervous control but its effects last longer.