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 Biology Questions

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Q:

Which of the following reproduce both, sexually as well as asexually?

A) Hydra B) Amoeba
C) ALgae D) Fungi
 
Answer & Explanation Answer: A) Hydra

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Q:

AIDS is caused by the Human Immunodeficiency Virus (HIV). The transmission of HIV infection generally occurs through

A) eating contaminated food and water   B) transfusion of contaminated blood and blood products
C) inhaling polluted air D) shaking hand with infected person
 
Answer & Explanation Answer: B) transfusion of contaminated blood and blood products

Explanation:

AIDS is caused by the Human Immuno deficiency Virus (HIV), a member of a group of viruses called retrovirus, which have an envelope enclosing the RNA genome. Transmission of HIV-infection generally occurs by (a) sexual contact with infected person, (b) by transfusion of contaminated blood and blood products, (c) by sharing infected needles as in the case of intravenous drug abusers and (d) from infected mother to her child through placenta.

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Q:

Lungs are the primary organs of _________.

A) Digestion B) Constipation
C) Perspiration D) Respiration
 
Answer & Explanation Answer: D) Respiration

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Q:

Molecular clocks are based on the idea that _____.

A) On average neutral mutations arise at a constant rate B) Directional selection occurs at a constant rate
C) Mutations occur once every generation D) Molecules resonate at a certain frequency that can be measured
 
Answer & Explanation Answer: C) Mutations occur once every generation

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Q:

____ tissue changes the diameter of a blood vessel.

A) Heart B) Muscle
C) Epithelial D) Bone
 
Answer & Explanation Answer: B) Muscle

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Q:

Plants utilise ________ from the atmosphere foe photosynthesis

A) oxygen B) nitrogen
C) Carbon dioxide D) hydrogen
 
Answer & Explanation Answer: C) Carbon dioxide

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Q:

______ is a strong drug that doctors give to people to make them calm or help them sleep.

A) Barbiturate B) Antidepressant
C) Antihistamine D) Beta-Blocker
 
Answer & Explanation Answer: A) Barbiturate

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Q:

Which of the following is not correct?

A) Members of Chlorophyceae are commonly called green algae B) Members of Phaeophyceae are commonly called red algae
C) Members of Rhodophyceae are commonly called red algae D) Members of Phaeophyceae are commonly called brown algae
 
Answer & Explanation Answer: B) Members of Phaeophyceae are commonly called red algae

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