The 'Lymphatic system' in the human body is crucial for immunity and fluid balance. The largest lymphatic organ is the: MCQ with Answer and Explanation

The 'Lymphatic system' in the human body is crucial for immunity and fluid balance. The largest lymphatic organ is the:
A. Spleen
B. Thymus
C. Peyer's patches
D. Tonsils
Answer: Option A
Solution (By JKExamLibrary)
The spleen is the largest organ in the lymphatic system. It plays a vital role in immune function by filtering blood, producing lymphocytes, and removing old or damaged red blood cells and platelets. The thymus is crucial for T-cell maturation but is largest in childhood and shrinks with age. Tonsils and Peyer's patches are smaller, localized lymphoid tissues. The spleen acts as a major blood filter and immune response center.

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Practice More Biology Questions

Question #1
In the female reproductive cycle, ovulation is triggered by a surge in:
A. Progesterone
B. Follicle-stimulating hormone (FSH)
C. Estrogen
D. Luteinizing hormone (LH)

Correct Answer: Option D


Explanation:
A mid-cycle surge in LH (luteinizing hormone) from the anterior pituitary triggers ovulation—the release of the secondary oocyte from the mature Graafian follicle. FSH stimulates follicle development. Estrogen levels rise before ovulation and provide positive feedback for the LH surge. Progesterone is secreted after ovulation by the corpus luteum.

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Question #2
The organelle that processes and packages proteins for secretion is the:
A. Rough endoplasmic reticulum
B. Ribosome
C. Golgi apparatus
D. Lysosome

Correct Answer: Option C


Explanation:
The Golgi apparatus modifies, sorts, and packages proteins and lipids into vesicles for transport to their destinations (secretion, plasma membrane, lysosomes). Ribosomes synthesize proteins, rough ER folds and transports them, lysosomes digest materials.

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Question #3
Consider the following statements regarding photosynthesis:
1. Light reactions occur in the thylakoid membranes.
2. Oxygen is released from carbon dioxide.
3. ATP and NADPH are produced in the light reactions.
Which of the above is/are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1, 2, and 3
D. 1 and 3 only

Correct Answer: Option D


Explanation:
Light reactions occur in thylakoid membranes, producing ATP, NADPH, and oxygen. Oxygen comes from water (photolysis), not CO₂. So statement 2 is incorrect. 1 and 3 are correct.

This question belongs to: Science Biology