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Class 10 Science — Chapter 5: Life Processes

68 practice questions · 23 Easy · 23 Medium · 22 Hard

Free NCERT-aligned multiple-choice practice for Class 10 Science, Chapter 5 (Life Processes). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 68.

Sample questions

Q1Easy

Which gas is released by green plants during photosynthesis?

A.Carbon dioxide
B.Oxygen✓ correct
C.Nitrogen
D.Hydrogen
Why

Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Oxygen is the by-product.

Q2Medium

Photosynthesis primarily occurs in the:

A.Mitochondria
B.Nucleus
C.Chloroplasts✓ correct
D.Endoplasmic reticulum
Why

Chloroplasts contain chlorophyll which captures light energy.

Q3Hard

Why do muscles cramp during heavy exercise?

A.Excess oxygen accumulates
B.Glucose is depleted entirely
C.Lactic acid builds up due to anaerobic respiration✓ correct
D.Nerve cells rupture
Why

When O₂ supply is insufficient, muscle cells respire anaerobically and produce lactic acid, causing cramps.

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