Class 10 Science DPP — Ch 5 — Life Processes | 25 July 2026

Assertion (A): During heavy exercise, muscles may produce lactic acid.
Reason (R): When oxygen supply is insufficient, glucose is broken down anaerobically.

Choose the correct option:

A. Both A and R are true, and R is the correct explanation of A B. Both A and R are true, but R is NOT the correct explanation of A C. A is true, but R is false D. A is false, but R is true

📝 SolutionDuring vigorous exercise oxygen supply to muscles falls short, so glucose is broken down anaerobically into lactic acid, causing cramps. R correctly explains A.

Transpiration in plants mainly occurs through:

A. roots B. stomata in leaves C. the stem bark D. fruits

📝 SolutionTranspiration is the loss of water vapour mainly through the stomata present on the surface of leaves.

The muscular tube through which food moves from mouth to stomach by peristalsis is the:

A. oesophagus B. trachea C. small intestine D. duodenum

📝 SolutionThe oesophagus (food pipe) carries food from the mouth to the stomach through wave-like muscular movements called peristalsis.

Which part of the human digestive system absorbs most of the digested food?

A. stomach B. large intestine C. small intestine D. oesophagus

📝 SolutionThe small intestine, with its finger-like villi, is the main site for absorption of digested nutrients into the blood.

Autotrophs are organisms that:

A. depend on others for food B. make their own food C. eat only meat D. do not need energy

📝 SolutionAutotrophs (like green plants) make their own food through photosynthesis, using sunlight, CO2 and water.

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