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Science · 2024 · 2 marks
CBSE 2024 · Region 5 · Set 1 · Q23
(a) Sometimes while running, the athletes suffer from muscle cramps. Why? How is the respiration in this case different from aerobic respiration?
(a)
Sometimes while running, the athletes suffer from muscle cramps. Why ? How is the respiration in this case different from aerobic respiration ?
OR
(b)
Write the other name given to lymph. State its two functions.
Marking-scheme solution
Formation of lactic acid in muscles causes cramps.
Aerobic respiration takes place in the presence of oxygen whereas the respiration taking place above is due to lack of oxygen. / End products of aerobic respiration are \(\displaystyle \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}+\) Energy whereas in the above case, Lactic acid + Energy is formed.
Tissue fluid / Extracellular fluid Functions :
i. Carries digested and absorbed fats from the intestine.
ii. Drains excess fluid from extracellular space back into the blood.
iii. Fight against infections.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.