In fish farming, 'induced breeding' is commonly achieved by injecting: MCQ with Answer and Explanation

In fish farming, 'induced breeding' is commonly achieved by injecting:
A. Insulin
B. Adrenaline
C. Thyroxine
D. Pituitary extract containing gonadotropins
Answer: Option D
Solution (By JKSSB Mock Tests)
In pisciculture, induced breeding is carried out by injecting fish with pituitary gland extract from donor fish containing gonadotropic hormones (FSH and LH), which stimulate spawning. This allows controlled production of fish seed. Hypophysation is the technique used in Indian major carps. Insulin and thyroxine are not involved in reproduction. Adrenaline is a stress hormone.

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The structure that produces antibodies is:
A. Macrophage
B. T lymphocyte
C. Neutrophil
D. Plasma cell (B cell)

Correct Answer: Option D


Explanation:
Plasma cells, differentiated from B lymphocytes, are the factories that produce and secrete large amounts of antibodies (immunoglobulins) specific to an antigen. Macrophages phagocytose, T cells regulate or directly kill, neutrophils phagocytose bacteria.

This question belongs to: Science Biology
Question #2
The blood group that lacks both antigens A and B is:
A. O
B. B
C. AB
D. A

Correct Answer: Option A


Explanation:
Blood group O has neither A nor B antigens on the red blood cells, but has both anti-A and anti-B antibodies in plasma. It is the universal donor for red cells. Group AB has both antigens, A has A antigen, B has B antigen.

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Question #3
In the XX-XY system of sex determination, the male is:
A. Homogametic (XX)
B. Haploid (X)
C. Heterogametic (XY)
D. Diploid (XX)

Correct Answer: Option C


Explanation:
In the XX-XY system of sex determination, found in humans and most mammals, females have two identical sex chromosomes (XX) and are homogametic, producing only X-bearing eggs. Males have two different sex chromosomes (XY) and are heterogametic, producing two types of sperm: 50% with X and 50% with Y. The sperm determines the sex of the offspring.

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