Which of the following is an advantage of seed dispersal? MCQ with Answer and Explanation

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Which of the following is an advantage of seed dispersal?

A. Avoids overcrowding and competition with parent plant

B. Competition between offspring

C. Increases soil erosion

D. Reduces genetic diversity

Answer: Option A

Solution (By JKSSB Mock Tests)

Seed dispersal spreads seeds away from the parent plant, reducing competition for light, water, nutrients, and space. It also aids in colonization of new habitats and increases species distribution. Dispersal agents include wind, water, animals, and explosive mechanisms. Overcrowding would lead to resource limitation. Genetic diversity is promoted by cross-pollination, not directly by dispersal.

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Question #1

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Consider statements about human immunity: 1. Colostrum provides passive immunity to infants. 2. Allergies are exaggerated immune responses. 3. Autoimmune diseases occur when the immune system attacks self-cells. Which are correct?

A. 1 and 2 only

B. 2 and 3 only

C. 1, 2 and 3

D. 1 and 3 only

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Correct Answer: Option C

Explanation:
Colostrum, the first milk produced by the mother, is rich in IgA antibodies, providing natural passive immunity to the newborn. Allergies (hypersensitivities) occur when the immune system overreacts to harmless environmental antigens (allergens). Autoimmune diseases arise when the immune system loses tolerance and mistakenly attacks the body's own healthy cells and tissues. All statements are correct.

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Question #2

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Which of the following is a steroid hormone?

A. Insulin

B. Adrenaline

C. Cortisol

D. Growth hormone

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Correct Answer: Option C

Explanation:
Cortisol (a glucocorticoid) from the adrenal cortex is a steroid hormone derived from cholesterol. Insulin and growth hormone are peptides, adrenaline is a catecholamine (amino acid derivative).

This question belongs to: Science Biology

Question #3

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The green pigment that traps light energy in plants is located in the:

A. Thylakoid membranes of chloroplasts

B. Cytoplasm

C. Cell wall

D. Nucleus

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Correct Answer: Option A

Explanation:
Chlorophyll, the primary photosynthetic pigment, is embedded in the thylakoid membranes within chloroplasts. These membranes contain photosystems I and II, where light-dependent reactions occur. The stroma of the chloroplast houses the Calvin cycle enzymes. Chlorophyll absorbs mainly blue and red light, reflecting green, giving leaves their color.

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