Ecosystem – CBSE Class 12 Previous Year Questions (2024–2026)

All 4 CBSE Class 12 previous-year questions from Ecosystem (Biology), 2024–2026, taken from 3 papers. Practise them together in one test with the official marking and answer key, then review every answer.

▶ Practise all 4 questionsAll CBSE Class 12 chapters

Ecosystem questions by paper

Sample questions

• CBSE Class 12 Biology Board 2026 (Set 57/1/1)
  In an ecosystem different species occupy different levels and vertical distribution of species is found This is called 1 A Stratification Layering Fragmentation…
• CBSE Class 12 Biology Board 2026 (Set 57/1/1)
  For Questions number 18 to 16 two statements are given one labelled as Assertion A and the other labelled as Reason Select the correct answer to these questions from…
• CBSE Class 12 Biology Board 2025 (Set 57/1/1)
  The process of mineralization by microorganisms help in the release of A inorganic nutrients from humus both organic and inorganic nutrients from detritus organic…
• CBSE Class 12 Biology Board 2024 (Set 57/1/1)
  The rate of formation of new organic matter by consumers and the biomass available for consumption of herbivores as well as decomposers are referred to as A Gross primary

Question text shown from the scanned paper; open the test to see each question exactly as printed.

More Biology chapters

• Sexual Reproduction in Flowering Plants 13
• Human Reproduction 9
• Reproductive Health 5
• Principles of Inheritance and Variation 12
• Molecular Basis of Inheritance 17
• Evolution 9
• Human Health and Disease 7
• Strategies for Enhancement in Food Production 3
• Microbes in Human Welfare 7
• Biotechnology: Principles and Processes 16
• Biotechnology and its Applications 9
• Organisms and Populations 2
• Biodiversity and Conservation 2
• Environmental Issues 2