Chapter 7: The Biosphere — Online MCQ Test
GEOGRAPHY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 7: The Biosphere with a free chapter-wise online MCQ test.
This chapter covers: Focusing on biogeography this chapter covers ecosystems biomes food chains energy flow and global biodiversity. Students study terrestrial aquatic biomes ecological conservation an....
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Chapter 7: The Biosphere — Important Questions & Answers
Which component of the biosphere includes all living organisms?
- A. Lithosphere
- B. Atmosphere
- C. Biotic component
- D. Hydrosphere
Answer: C. Biotic component
The biosphere is composed of the biotic component, which includes all living organisms interacting with their environment.
The biosphere is composed of the biotic component, which includes all living organisms interacting with their environment.
What is the primary source of energy for almost all ecosystems on Earth?
- A. Geothermal heat
- B. Solar radiation
- C. Chemical energy
- D. Wind energy
Answer: B. Solar radiation
Solar energy is the fundamental driver of photosynthesis, supporting the primary productivity of most ecosystems.
Solar energy is the fundamental driver of photosynthesis, supporting the primary productivity of most ecosystems.
The process by which energy is transferred from one trophic level to another is called:
- A. Food chain
- B. Carbon cycle
- C. Nitrogen fixation
- D. Biological magnification
Answer: A. Food chain
A food chain represents the linear sequence of organisms through which energy and nutrients pass.
A food chain represents the linear sequence of organisms through which energy and nutrients pass.
Analyze the impact of human activity on biodiversity. Which practice primarily leads to habitat fragmentation?
- A. Reforestation
- B. Sustainable farming
- C. Road and urban construction
- D. Establishing wildlife sanctuaries
Answer: C. Road and urban construction
Urbanization and the building of infrastructure divide contiguous habitats into smaller, isolated patches, reducing biodiversity.
Urbanization and the building of infrastructure divide contiguous habitats into smaller, isolated patches, reducing biodiversity.
Why is the tropical rainforest considered to have the highest biodiversity despite the soil being nutrient-poor?
- A. High levels of sunlight and precipitation drive rapid nutrient cycling and growth.
- B. The temperature is always below freezing to preserve seeds.
- C. The lack of sunlight prevents all but a few species from growing.
- D. The soil is constantly being replenished by volcanic activity.
Answer: A. High levels of sunlight and precipitation drive rapid nutrient cycling and growth.
Rapid decomposition in the warm, wet climate means nutrients are quickly recycled and taken up by plants rather than staying in the soil.
Rapid decomposition in the warm, wet climate means nutrients are quickly recycled and taken up by plants rather than staying in the soil.