Which of the following is a characteristic of living organisms but NOT of non-living objects? MCQ with Answer and Explanation

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Which of the following is a characteristic of living organisms but NOT of non-living objects?

A. Occurrence in nature

B. Possession of mass

C. Ability to respond to stimuli

D. Increase in size

Answer: Option C

Solution (By JKExamLibrary)

Living organisms exhibit irritability, i.e., they detect and respond to changes in their environment. Non-living objects can increase in size (e.g., crystal growth), possess mass, and occur in nature, but they lack consciousness and the ability to respond to stimuli. Thus, responsiveness is a defining property of life.

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Question #1

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Consider the following statements about AIDS:
1. It is caused by a bacterium.
2. It weakens the immune system.
3. It can be transmitted by sharing needles.
Which of the above is/are correct?

A. 1, 2, and 3

B. 1 and 2 only

C. 1 and 3 only

D. 2 and 3 only

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Correct Answer: Option D

Explanation:
AIDS is caused by HIV, a virus, not bacterium. It destroys CD4+ T-cells, weakening immunity, and spreads via blood/needles, sexual contact, etc. So 2 and 3 are correct.

This question belongs to: Science Biology

Question #2

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The enzyme that breaks down acetylcholine in the synaptic cleft is:

A. Catechol-O-methyltransferase

B. Acetylcholinesterase

C. Monoamine oxidase

D. Choline acetyltransferase

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Correct Answer: Option B

Explanation:
Acetylcholinesterase degrades acetylcholine into acetate and choline, terminating the synaptic signal. Choline acetyltransferase synthesizes ACh, MAO and COMT degrade monoamines.

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Question #3

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Consider statements about human nutrition: 1. A balanced diet contains all essential nutrients. 2. Malnutrition can be caused by overeating. 3. Water is not a nutrient. Which are correct?

A. 2 and 3 only

B. 1 and 3 only

C. 1, 2 and 3

D. 1 and 2 only

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Correct Answer: Option D

Explanation:
A balanced diet provides all the essential nutrients (carbohydrates, proteins, fats, vitamins, minerals, and water) in the correct proportions required for optimal health and growth. Malnutrition refers to deficiencies, excesses, or imbalances in a person's intake of energy and/or nutrients; therefore, overeating (leading to obesity) is a form of malnutrition. Water is an essential nutrient, crucial for hydration, transport, and chemical reactions, though it provides no calories. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology

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