Question Paper
Class / Subject: Class 8 (CBSE) · Science
Chapter: Chapter 12 — Chapter 12: How Nature Works in Harmony
Time Allowed: 15 minutes
Max Marks: 6
1. Living components of an ecosystem are called: [1]
(A) biotic factors
(B) abiotic factors
(C) producers only
(D) decomposers only
2. Organisms that break down dead matter and recycle nutrients are called: [1]
(A) decomposers
(B) producers
(C) consumers
(D) predators
3. Non-living components of an ecosystem, like sunlight and temperature, are called: [1]
(A) abiotic factors
(B) biotic factors
(C) consumers
(D) producers
4. A food chain always starts with: [1]
(A) a producer (plant)
(B) a top predator
(C) a decomposer
(D) a consumer
5. Approximately what percentage of energy transfers between trophic levels? [1]
(A) 10%
(B) 50%
(C) 90%
(D) 100%
6. A network of interconnected food chains in an ecosystem is called a: [1]
(A) food web
(B) food pyramid only
(C) single food chain
(D) ecosystem cycle