In the human body, the 'Islets of Langerhans' are found in the: MCQ with Answer and Explanation

In the human body, the 'Islets of Langerhans' are found in the:
A. Pancreas
B. Spleen
C. Liver
D. Kidneys
Answer: Option A
Solution (By JKSSB Mock Tests)
The Islets of Langerhans are the endocrine (hormone-producing) portions of the pancreas. They are clusters of cells scattered throughout the pancreatic tissue, comprising about 1-2% of the pancreas's mass. They contain several cell types, primarily alpha cells (secreting glucagon), beta cells (secreting insulin), delta cells (secreting somatostatin), and F cells (secreting pancreatic polypeptide). These hormones are crucial for regulating blood glucose levels.

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Practice More Biology Questions

Question #1
The substance that makes the fungal cell wall rigid is:
A. Chitin
B. Peptidoglycan
C. Lignin
D. Cellulose

Correct Answer: Option A


Explanation:
Fungal cell walls contain chitin, a strong, flexible polysaccharide also found in arthropod exoskeletons. Cellulose is in plant walls, peptidoglycan in bacterial walls, lignin in secondary plant walls. Chitin provides structural support and protection against environmental stress.

This question belongs to: Science Biology
Question #2
Identify the INCORRECT statement about the human body:
A. The liver is the largest gland.
B. The heart is located on the right side of the chest.
C. The femur is the longest bone.
D. The skin is the largest organ.

Correct Answer: Option B


Explanation:
The heart is situated in the mediastinum slightly left of the midline. All other statements are true.

This question belongs to: Science Biology
Question #3
Consider statements about human immunity: 1. B-lymphocytes produce antibodies. 2. T-lymphocytes are involved in cell-mediated immunity. 3. Vaccines cure active viral infections. Which are correct?
A. 1 and 3 only
B. 2 and 3 only
C. 1 and 2 only
D. 1, 2 and 3

Correct Answer: Option C


Explanation:
B-lymphocytes (B cells) differentiate into plasma cells that secrete antibodies, providing humoral immunity. T-lymphocytes (T cells) are responsible for cell-mediated immunity, directly attacking infected or cancerous cells. Vaccines are prophylactic; they stimulate the immune system to develop memory and prevent future infections, but they do not cure active, ongoing viral infections. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology