Which characteristic is exclusive to living organisms and not observed in non-living entities? MCQ with Answer and Explanation

Which characteristic is exclusive to living organisms and not observed in non-living entities?
A. Increase in mass
B. Crystallization
C. Magnetism
D. Consciousness
Answer: Option D
Solution (By JKExamLibrary)
Consciousness is the defining property of living organisms, allowing them to sense and respond to stimuli. Non-living objects can increase in mass (e.g., crystal growth), crystallize, or exhibit magnetism, but they lack consciousness. Reproduction and metabolism are also key characteristics, but consciousness is the most fundamental feature. Thus, only living things possess this ability.

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The largest artery in the human body is the:
A. Aorta
B. Pulmonary artery
C. Carotid artery
D. Coronary artery

Correct Answer: Option A


Explanation:
The aorta is the main and largest artery originating from the left ventricle, distributing oxygenated blood to all parts of the body through its branches. The pulmonary artery carries deoxygenated blood to lungs. Coronary arteries supply the heart muscle, carotid arteries supply the brain. The aorta has a diameter of about 2-3 cm in adults.

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Question #2
Which plant hormone is responsible for the 'bolting' effect in rosette plants like cabbage and beet?
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Correct Answer: Option B


Explanation:
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Question #3
The process by which two different organisms live together and both benefit is:
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Correct Answer: Option A


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Mutualism is a symbiotic interaction where both species benefit (+/+). Examples: Rhizobium-legume association, lichens, mycorrhizae, and oxpecker-rhino. Parasitism benefits one at the expense of the other (+/-), commensalism benefits one without affecting the other (+/0), amensalism harms one without benefit to the other (-/0). Mutualism is crucial for ecosystem functioning.

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