Blood group AB is considered the universal recipient because: MCQ with Answer and Explanation

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Blood group AB is considered the universal recipient because:

A. It has no Rh antigen.

B. It has both A and B antibodies.

C. It has no A or B antigens.

D. It has both A and B antigens and no antibodies.

Answer: Option D

Solution (By JKExamLibrary)

AB positive blood has A and B antigens on RBCs and lacks anti-A and anti-B antibodies, so it can receive blood from any ABO group without agglutination.

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Question #1

Which of the following is an algal biofertilizer used in rice fields?

A. Azospirillum

B. Trichoderma

C. Nostoc

D. Rhizobium

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Correct Answer: Option C

Explanation:
Nostoc is a cyanobacterium (blue-green alga) that fixes atmospheric nitrogen and is used as a biofertilizer in rice paddies. Anabaena azollae with Azolla is also common. Rhizobium is bacterial biofertilizer for legumes, Azospirillum is a free-living nitrogen-fixing bacterium. Trichoderma is a fungal biocontrol agent. BGA biofertilizers increase organic nitrogen in soil.

This question belongs to: Science Biology

Question #2

Identify the correct statement about the circulatory system:

A. Arteries always carry oxygenated blood.

B. Capillaries have valves to prevent backflow.

C. Veins have thin, elastic walls compared to arteries.

D. The pulmonary artery carries oxygenated blood.

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Correct Answer: Option C

Explanation:
Veins have thinner walls than arteries and contain valves. The pulmonary artery carries deoxygenated blood, and arteries normally (except pulmonary) carry oxygenated blood.

This question belongs to: Science Biology

Question #3

Consider statements about microorganisms: 1. Algae are photosynthetic. 2. Protozoa are multicellular. 3. Fungi reproduce by spores. Which are correct?

A. 1 and 3 only

B. 1 and 2 only

C. 1, 2 and 3

D. 2 and 3 only

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Correct Answer: Option A

Explanation:
Algae are a diverse group of photosynthetic, eukaryotic organisms ranging from unicellular to multicellular forms. Protozoa are unicellular, heterotrophic eukaryotic organisms, not multicellular. Fungi typically reproduce asexually and sexually through the formation of spores, which are dispersed to form new individuals. Thus, statements 1 and 3 are correct.

This question belongs to: Science Biology

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