In the human body, the 'Cerebrospinal Fluid' (CSF) is a clear, colorless body fluid found in the brain and spinal cord. It is primarily produced by the: MCQ with Answer and Explanation

In the human body, the 'Cerebrospinal Fluid' (CSF) is a clear, colorless body fluid found in the brain and spinal cord. It is primarily produced by the:
A. Choroid plexus in the ventricles
B. Pia mater
C. Dura mater
D. Arachnoid mater
Answer: Option A
Solution (By JKSSB Mock Tests)
Cerebrospinal Fluid (CSF) is a clear, watery fluid that circulates through the ventricles of the brain, the central canal of the spinal cord, and the subarachnoid space. It provides mechanical protection (cushioning), chemical stability, and waste removal for the central nervous system. CSF is primarily produced by the choroid plexus, which is a network of highly vascularized, specialized ependymal cells located within the ventricles of the brain (lateral, third, and fourth ventricles).

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Question #1
Consider statements about cell division: 1. Cytokinesis in plant cells occurs by cell plate formation. 2. Meiosis maintains the chromosome number. 3. Mitosis occurs in somatic cells. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 1, 2 and 3
D. 2 and 3 only

Correct Answer: Option A


Explanation:
In plant cells, which have rigid cell walls, cytokinesis occurs by the formation of a new cell wall (cell plate) in the middle of the cell. Mitosis is equational division occurring in somatic cells for growth and repair, maintaining the same chromosome number. Meiosis is reductional division, halving the chromosome number to produce gametes. Thus, statements 1 and 3 are correct.

This question belongs to: Science Biology
Question #2
Filariasis, leading to elephantiasis, is caused by:
A. Fasciola hepatica
B. Ascaris lumbricoides
C. Trichinella spiralis
D. Wuchereria bancrofti

Correct Answer: Option D


Explanation:
Filariasis, commonly known as elephantiasis due to the severe swelling of limbs and genitals, is caused by filarial worms like Wuchereria bancrofti and Wuchereria malayi. These thread-like nematodes are transmitted by the bite of infected Culex mosquitoes. The adult worms lodge in the lymphatic vessels, causing chronic inflammation and blockage.

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Question #3
Consider the following statements about AIDS:
1. It is caused by a bacterium.
2. It weakens the immune system.
3. It can be transmitted by sharing needles.
Which of the above is/are correct?
A. 1 and 3 only
B. 1, 2, and 3
C. 2 and 3 only
D. 1 and 2 only

Correct Answer: Option C


Explanation:
AIDS is caused by HIV, a virus, not bacterium. It destroys CD4+ T-cells, weakening immunity, and spreads via blood/needles, sexual contact, etc. So 2 and 3 are correct.

This question belongs to: Science Biology