Which of the following blood groups is considered the universal donor? MCQ with Answer and Explanation

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Which of the following blood groups is considered the universal donor?

A. AB positive

B. O negative

C. B negative

D. A positive

Answer: Option B

Solution (By JKSSB Mock Tests)

O negative blood group lacks A and B antigens on RBCs and Rh antigen. Hence, it can be transfused to any person without causing agglutination, making it the universal donor. AB positive has both antigens and is the universal recipient. Blood grouping is based on ABO and Rh systems. O negative is crucial in emergency transfusions when blood type is unknown.

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Question #1

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In angiosperms, the functional megaspore undergoes mitotic divisions to form the embryo sac, which typically contains:

A. 7 cells, 7 nuclei

B. 4 cells, 4 nuclei

C. 8 cells, 8 nuclei

D. 7 cells, 8 nuclei

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Correct Answer: Option D

Explanation:
The female gametophyte (embryo sac) in angiosperms is typically monosporic (develops from one functional megaspore). The megaspore undergoes three successive mitotic divisions to form an 8-nucleate, 7-celled structure. This includes 3 antipodal cells, 2 synergids, 1 egg cell, and 1 central cell containing 2 polar nuclei. Exam tip: Remember '8 nuclei, 7 cells' because the central cell has 2 nuclei but is 1 cell.

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Question #2

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The hormone that stimulates the release of glucocorticoids from the adrenal cortex is:

A. Prolactin

B. TSH

C. FSH

D. ACTH

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Correct Answer: Option D

Explanation:
Adrenocorticotropic hormone (ACTH), secreted by the anterior pituitary, stimulates the adrenal cortex to produce and release glucocorticoids like cortisol, which regulate metabolism and stress response. TSH stimulates the thyroid, FSH stimulates gonads, and prolactin stimulates milk production. ACTH is part of the HPA axis.

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Question #3

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Which of the following is a correct statement about biofertilizers?

A. They are chemical fertilizers that enhance crop yield.

B. They are living organisms that enrich soil nutrient content.

C. They are synthetic growth regulators.

D. They are toxic to soil organisms.

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Correct Answer: Option B

Explanation:
Biofertilizers contain living microorganisms like bacteria, cyanobacteria, and fungi that increase nutrient availability (e.g., nitrogen fixation, phosphorus solubilization) for plants. They are eco-friendly and sustainable. Chemical fertilizers are synthetic inorganic salts. Biopesticides control pests. Examples: Rhizobium, Azotobacter, mycorrhiza. Biofertilizers improve soil health without chemical residue.

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