In animal husbandry, the crossbreeding of superior males of one breed with superior females of another breed is called: MCQ with Answer and Explanation

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In animal husbandry, the crossbreeding of superior males of one breed with superior females of another breed is called:

A. Crossbreeding

B. Outcrossing

C. Grading up

D. Inbreeding

Answer: Option A

Solution (By JKExamLibrary)

Crossbreeding involves mating individuals of different breeds to combine desirable traits and exploit hybrid vigor (heterosis). Inbreeding is within the same breed, outcrossing is within breed but unrelated, grading up is repeated crossing with a superior breed. Crossbreeding improves productivity in dairy and meat animals.

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The disease caused by the deficiency of protein in children is:

A. Obesity

B. Marasmus

C. Beriberi

D. Kwashiorkor

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Correct Answer: Option D

Explanation:
Kwashiorkor results from severe protein deficiency with adequate calories, causing edema, pot belly, and skin lesions. Marasmus is overall calorie deficiency, beriberi thiamine.

This question belongs to: Science Biology

Question #2

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The structure that prevents backflow of blood from the left ventricle to the left atrium is the:

A. Aortic valve

B. Pulmonary valve

C. Tricuspid valve

D. Mitral valve

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Correct Answer: Option D

Explanation:
The bicuspid (mitral) valve has two cusps and closes during ventricular systole to prevent regurgitation into the left atrium. The tricuspid valve is on the right.

This question belongs to: Science Biology

Question #3

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The scientist who first observed the nucleus in plant cells was:

A. Robert Hooke

B. Robert Brown

C. Antonie van Leeuwenhoek

D. Matthias Schleiden

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Correct Answer: Option B

Explanation:
Robert Brown, a Scottish botanist, discovered the nucleus in 1831 while studying orchid cells under a microscope. He named it 'nucleus'. Hooke discovered cells, Leeuwenhoek observed living cells, Schleiden proposed that all plants are made of cells. Brown's discovery was crucial for understanding cell structure and function.

This question belongs to: Science Biology

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