Which of the following is considered the defining property of living organisms? MCQ with Answer and Explanation

Which of the following is considered the defining property of living organisms?
A. Reproduction
B. Metabolism
C. Growth
D. Movement
Answer: Option B
Solution (By JKExamLibrary)
Metabolism is the sum of all chemical reactions occurring in a living body. It is the only feature present in all living organisms without exception. While growth and reproduction are common, they are not universal (e.g., sterile mules). Non-living things can also exhibit growth by accumulation or movement, making metabolism the true defining property.

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Practice More Biology Questions

Question #1
The mineral element essential for the synthesis of thyroid hormones is:
A. Iron
B. Calcium
C. Iodine
D. Zinc

Correct Answer: Option C


Explanation:
Iodine is a key constituent of the thyroid hormones thyroxine (T₄) and triiodothyronine (T₃). Deficiency leads to goiter and hypothyroidism. Iron is for hemoglobin, calcium for bones, zinc for enzyme function. Iodized salt is a public health measure to ensure adequate iodine intake.

This question belongs to: Science Biology
Question #2
Consider statements about human immunity: 1. Skin is a physical barrier. 2. Phagocytosis is a specific immune response. 3. Memory cells provide long-term immunity. Which are correct?
A. 1 and 3 only
B. 1, 2 and 3
C. 1 and 2 only
D. 2 and 3 only

Correct Answer: Option A


Explanation:
The skin and mucous membranes act as primary physical barriers in innate immunity, preventing pathogen entry. Phagocytosis by macrophages and neutrophils is a non-specific (innate) cellular defense mechanism, not a specific immune response. Memory B and T cells are produced during the primary specific immune response and provide rapid, long-lasting immunity upon re-exposure. Thus, statements 1 and 3 are correct.

This question belongs to: Science Biology
Question #3
The openings on the leaf surface for gas exchange are called:
A. Hydathodes
B. Cuticles
C. Stomata
D. Lenticels

Correct Answer: Option C


Explanation:
Stomata are pores flanked by guard cells that regulate gas exchange and transpiration. Lenticels are on bark, hydathodes for guttation.

This question belongs to: Science Biology