MCQs for Up Bsc Nursing CNET ABVMU Chapter 12 : Ecosystem Class 12 MCQs
1. An ecosystem consists of
a) Only living organisms
b) Only non-living components
c) Only plants and animals
d) Both living organisms and their physical environment
2. The primary source of energy in most ecosystems is
a) Wind energy
b) Solar energy
c) Geothermal energy
d) Biomass energy
3. Decomposers in an ecosystem are responsible for:
a) Capturing solar energy and converting it into food
b) Breaking down dead organic matter into simple compounds
c) Producing oxygen through photosynthesis
d) Absorbing nutrients from the soil for plant growth
4. Which trophic level in an ecosystem represents the primary producers?
a) Herbivores
b) Carnivores
c) Producers
d) Decomposers
5. The biotic component of an ecosystem includes:
a) Air, water, and soil
b) Producers, consumers, and decomposers
c) Sunlight and minerals
d) All living organisms
6. The transfer of energy and nutrients between trophic levels in an ecosystem is known as
a) Decomposition
b) Food chain
c) Biomagnification
d) Photosynthesis
7. Which of the following statements is true about a food web in an ecosystem?
a) It represents the flow of energy in a single direction from producers to decomposers.
b) It consists of only a single chain of feeding relationships.
c) It shows the interconnectedness of multiple food chains.
d) It includes only primary consumers and decomposers.
8. Which of the following is an abiotic factor in an ecosystem?
a) Producers
b) Consumers
c) Temperature
d) Decomposers
9. The ultimate source of energy in an ecosystem is
a) Producers
b) Consumers
c) Sunlight
d) Decomposers
10. Complete the food chain with the correct terms:
| A | B | C | D | |
| i | Primary Consumer | Producer | Secondary Consumer | Tertiary Consumer |
| ii | Producer | Secondary Consumer | Primary Consumer | Tertiary Consumer |
| iii | Producer | Primary Consumer | Secondary Consumer | Tertiary Consumer |
| iv | Tertiary Consumer | Secondary Consumer | Primary Consumer | Producer |
options;
a) i
b) ii
c) iii
d) iv
Answer Key
1. d) Both living organisms and their physical environment
2. b) Solar energy
3. b) Breaking down dead organic matter into simple compounds
4. c) Producers
5. b) Producers, consumers, and decomposers
6. b) Food chain
7. c) It shows the interconnectedness of multiple food chains.
8. c) Temperature
9. c) Sunlight
10. c) iii
| Chapter Name | Chapter Link |
|---|---|
| Sexual Reproduction in Flowering Plants | Link |
| Human Reproduction | Link |
| Reproductive Health | Link |
| Principles of Inheritance and Variation | Link |
| Molecular Basis Of Inheritance | Link |
| Evolution | Link |
| Human Health and Disease | Link |
| Microbes in Human Welfare | Link |
| Biotechnology : Principles and Process | Link |
| Biotechnology and its Applications | Link |
| Organism And Population | Link |
| Ecosystem | Link |
| Biodiversity and Conservation | Link |
