Consider statements about animal husbandry: 1. Artificial insemination improves cattle breeds. 2. Multiple Ovulation Embryo Transfer is used in poultry. 3. Crossbreeding combines traits of two breeds. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about animal husbandry: 1. Artificial insemination improves cattle breeds. 2. Multiple Ovulation Embryo Transfer is used in poultry. 3. Crossbreeding combines traits of two breeds. Which are correct?

A. 1 and 2 only

B. 1 and 3 only

C. 2 and 3 only

D. 1, 2 and 3

Answer: Option B

Solution (By JKSSB Mock Tests)

Artificial insemination allows the use of superior bull semen to improve cattle genetics widely. Multiple Ovulation Embryo Transfer (MOET) is a technique used in cattle and other mammals to increase herd improvement rates, not in poultry (which uses hatching eggs). Crossbreeding involves mating animals of different breeds to combine desirable traits and exploit hybrid vigor. Thus, statements 1 and 3 are correct.

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Question #1

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The fossil Archaeopteryx provides evidence for the evolutionary link between:

A. Reptiles and mammals

B. Reptiles and birds

C. Fish and amphibians

D. Amphibians and reptiles

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Correct Answer: Option B

Explanation:
Archaeopteryx lithographica, a Jurassic fossil, exhibits features of both reptiles (teeth, bony tail, claws) and birds (feathers, wings), supporting the theory that birds evolved from theropod dinosaurs. It is a classic transitional fossil. Tiktaalik links fish and amphibians, cynodonts link reptiles and mammals.

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Question #2

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Bile juice is secreted by the:

A. Liver

B. Gall bladder

C. Duodenum

D. Pancreas

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Correct Answer: Option A

Explanation:
Bile juice is continuously secreted by the liver. It is stored and concentrated in the gall bladder and released into the duodenum (first part of the small intestine) when food enters. Bile contains bile salts (like bilirubin and biliverdin) which are crucial for the emulsification of fats, breaking them into smaller micelles for easier digestion by lipases.

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Question #3

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Which of the following is an example of active transport across the cell membrane?

A. Osmosis

B. Sodium-Potassium Pump

C. Facilitated diffusion

D. Diffusion

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Correct Answer: Option B

Explanation:
Active transport requires energy (ATP) to move molecules against their concentration gradient. The Sodium-Potassium pump (Na+/K+ ATPase) is a classic example, moving 3 Na+ ions out of the cell and 2 K+ ions into the cell per ATP hydrolyzed. Osmosis, diffusion, and facilitated diffusion are passive processes.

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