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Class 12 Biology — Chapter 12: Ecosystem
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 12 Biology, Chapter 12 (Ecosystem). 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 90.
Sample questions
Q1Easy
Producers in an ecosystem:
A.Green plants and autotrophs✓ correct
B.Carnivores
C.Decomposers
D.Parasites
Why
Convert solar energy via photosynthesis.
Q2Medium
Nitrogen fixation by:
A.Rhizobium / Cyanobacteria✓ correct
B.Plants directly
C.Animals only
D.Sunlight
Why
Converts N₂ to ammonia.
Q3Hard
Net Primary Productivity (NPP) =
A.GPP − Respiration✓ correct
B.GPP × Respiration
C.GPP + Respiration
D.Respiration only
Why
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