Which of the following diseases is caused by a virus? MCQ with Answer and Explanation

Question
Which of the following diseases is caused by a virus?
A. Malaria
B. Measles
C. Cholera
D. Anthrax
Answer: Option B
Solution (By JKSSB Mock Tests)
Measles (rubeola) is a highly contagious viral disease caused by the measles virus (a paramyxovirus), characterized by fever, cough, and a distinctive red rash. Anthrax is bacterial (Bacillus anthracis), malaria is protozoan, cholera is bacterial. Measles can be prevented by the MMR vaccine. It is a leading cause of child mortality in unvaccinated populations.
This question belongs to: Science Biology
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Question #1
The gland that regulates sleep-wake cycles by secreting melatonin is the:
A. Thymus
B. Pituitary
C. Thyroid
D. Pineal
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Correct Answer: Option D

Explanation:
The pineal gland, a small endocrine gland in the brain, secretes melatonin in response to darkness, regulating circadian rhythms and sleep patterns. The pituitary controls other glands, thyroid metabolism, thymus immune development.
This question belongs to: Science Biology
Question #2
Consider statements about microorganisms: 1. Algae are photosynthetic. 2. Protozoa are multicellular. 3. Fungi reproduce by spores. Which are correct?
A. 1, 2 and 3
B. 1 and 3 only
C. 2 and 3 only
D. 1 and 2 only
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Correct Answer: Option B

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
Question #3
The structure that controls the entry of light into the eye by adjusting pupil size is the:
A. Cornea
B. Retina
C. Iris
D. Lens
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Correct Answer: Option C

Explanation:
The iris contains smooth muscle fibers (sphincter and dilator) that regulate the diameter of the pupil. The cornea and lens focus light, retina senses it.
This question belongs to: Science Biology
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