Which of the following is a water-borne bacterial disease? MCQ with Answer and Explanation

Question
Which of the following is a water-borne bacterial disease?
A. Ringworm
B. Dengue
C. Influenza
D. Cholera
Answer: Option D
Solution (By JKSSB Mock Tests)
Cholera is caused by Vibrio cholerae, transmitted through contaminated water and food, causing severe watery diarrhea and dehydration. Influenza is a viral respiratory disease, ringworm is a fungal infection, dengue is a mosquito-borne viral disease. Cholera toxin disrupts ion transport in intestinal cells, leading to massive fluid loss. ORS (oral rehydration solution) is a simple life-saving treatment.
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Question #1
Which of the following is an example of a mutualistic symbiosis?
A. Tapeworm in human gut
B. Barnacles on whale skin
C. Lichen (algae and fungus)
D. Mosquito sucking blood
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Correct Answer: Option C

Explanation:
Lichens are a mutualistic association between an alga (or cyanobacterium) and a fungus. The alga photosynthesizes, providing food; the fungus provides shelter, water, and minerals. Both benefit. Tapeworm is parasitism, barnacles on whales commensalism (or sometimes parasitism depending on effect), mosquito blood-sucking is parasitism.
This question belongs to: Science Biology
Question #2
Consider the following statements about the cell membrane:
1. It is composed of a phospholipid bilayer.
2. It is fully permeable.
3. Proteins are embedded in the membrane.
Which of the above is/are correct?
A. 2 and 3 only
B. 1 and 3 only
C. 1 and 2 only
D. 1, 2, and 3
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Correct Answer: Option B

Explanation:
The cell membrane has a phospholipid bilayer with embedded proteins and is selectively permeable, not fully permeable. So 2 is incorrect.
This question belongs to: Science Biology
Question #3
The gap between two neurons across which nerve impulses pass is called:
A. Soma
B. Dendrite
C. Axon
D. Synapse
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Correct Answer: Option D

Explanation:
A synapse is the junction between two neurons (or neuron and effector) where the nerve impulse is transmitted from the presynaptic neuron to the postsynaptic neuron, usually via neurotransmitters. Axon carries impulses away from the cell body, dendrites receive signals, soma is the cell body. Synaptic transmission can be chemical or electrical.
This question belongs to: Science Biology
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