Identify the INCORRECT statement about the human nervous system: MCQ with Answer and Explanation

Question
Identify the INCORRECT statement about the human nervous system:
A. The cerebellum maintains body balance.
B. The cerebrum controls voluntary actions.
C. The hypothalamus controls reflex actions of the spinal cord.
D. The medulla oblongata regulates heartbeat and respiration.
Answer: Option C
Solution (By JKSSB Mock Tests)
The hypothalamus regulates body temperature, hunger, and thirst, and controls the pituitary. Reflex actions are primarily coordinated by the spinal cord, not the hypothalamus. Hence, D is incorrect.
This question belongs to: Science Biology
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Question #1
Diatomaceous earth, used in filtration and polishing, is formed from the cell walls of:
A. Euglenoids
B. Green algae
C. Dinoflagellates
D. Diatoms
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Correct Answer: Option D

Explanation:
Diatomaceous earth is a siliceous, sedimentary rock formed from the fossilized remains of diatoms. Diatoms have unique, highly resistant cell walls called frustules, made of hydrated silicon dioxide (silica). Over millions of years, these frustules accumulate on ocean and lake floors, forming diatomaceous earth, which has numerous industrial applications due to its abrasive and porous nature.
This question belongs to: Science Biology
Question #2
Assertion (A): Viruses are considered obligate intracellular parasites. Reason (R): They lack their own metabolic machinery and require a host cell to multiply.
A. A is false, but R is true.
B. A is true, but R is false.
C. Both A and R are true, but R is not the correct explanation.
D. Both A and R are true, and R is the correct explanation of A.
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Correct Answer: Option D

Explanation:
Viruses are non-living outside a host; they cannot carry out metabolic processes or reproduce independently. They hijack the host cell's machinery to replicate. Thus, they are obligate intracellular parasites. The reason correctly explains the assertion.
This question belongs to: Science Biology
Question #3
Assertion (A): The process of breathing is also called pulmonary ventilation.
Reason (R): It involves the movement of air into and out of the lungs.
A. Both A and R are true, and R is the correct explanation.
B. A true, R false.
C. Both A and R are true, but R is not the correct explanation.
D. A false, R true.
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Correct Answer: Option A

Explanation:
Pulmonary ventilation is the mechanical process of moving air in (inspiration) and out (expiration), which is breathing. R correctly defines it.
This question belongs to: Science Biology
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