The lymphatic system returns leaked fluid from tissues back to the: MCQ with Answer and Explanation

The lymphatic system returns leaked fluid from tissues back to the:
A. Kidneys
B. Lungs
C. Heart
D. Bloodstream
Answer: Option D
Solution (By JKSSB Mock Tests)
Lymphatic vessels collect interstitial fluid (lymph) and return it to the venous circulation (subclavian veins). This maintains fluid balance. Along the way, lymph nodes filter pathogens. The heart pumps blood, kidneys filter blood, lungs exchange gases. The lymphatic system is unidirectional.

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The enzyme in saliva that begins starch digestion is:
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B. Amylase
C. Trypsin
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Correct Answer: Option B


Explanation:
Salivary amylase (ptyalin) hydrolyzes starch into maltose and dextrins in the mouth. It functions optimally at neutral to slightly alkaline pH. Pepsin digests proteins in the stomach, lipase digests fats, trypsin is a pancreatic protease. Salivary amylase action ceases in the acidic stomach.

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The scientist who proposed the theory of evolution by natural selection is:
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Correct Answer: Option A


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Charles Darwin, in 'On the Origin of Species' (1859), proposed natural selection as the mechanism for evolution, based on variation, inheritance, and differential survival. Mendel discovered genetics, Pasteur disproved spontaneous generation, Lamarck proposed inheritance of acquired characters. Wallace independently arrived at natural selection.

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Question #3
Consider statements about animal husbandry: 1. The Murrah breed is famous for high milk yield in buffaloes. 2. The Leghorn breed is famous for egg production in poultry. 3. Apiculture refers to fish farming. Which are correct?
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