Unit 8: Ecology & Environment — Online MCQ Test
ZOOLOGY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board
Practice Unit 8: Ecology & Environment with a free chapter-wise online MCQ test.
This chapter covers: The final chapter examines ecosystem components abiotic biotic factors food chains energy flow biogeochemical cycles population ecology adaptational strategies and environmental po....
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Unit 8: Ecology & Environment — Important Questions & Answers
Which of the following is an abiotic component of an ecosystem?
- A. Grass
- B. Rabbit
- C. Sunlight
- D. Fungus
Answer: C. Sunlight
Sunlight is a non-living factor, so it is an abiotic component. Grass, rabbit, and fungus are living components and therefore biotic.
Sunlight is a non-living factor, so it is an abiotic component. Grass, rabbit, and fungus are living components and therefore biotic.
The transfer of energy from one organism to another in a sequence is called a:
- A. Food chain
- B. Food web
- C. Trophic level
- D. Ecological pyramid
Answer: A. Food chain
A food chain is a linear sequence showing how energy passes from one organism to the next. A food web is a network of interconnected food chains.
A food chain is a linear sequence showing how energy passes from one organism to the next. A food web is a network of interconnected food chains.
The increase in population size when birth rate exceeds death rate is called:
- A. Dispersion
- B. Natality
- C. Population growth
- D. Migration
Answer: C. Population growth
Population growth refers to the increase in the number of individuals in a population over time. It depends mainly on natality, mortality, immigration, and emigration.
Population growth refers to the increase in the number of individuals in a population over time. It depends mainly on natality, mortality, immigration, and emigration.
Which of the following is NOT a characteristic of an ecological pyramid?
- A. It represents trophic levels
- B. It may be upright or inverted
- C. It always shows energy loss at each level
- D. It is used to study feeding relationships
Answer: D. It is used to study feeding relationships
Ecological pyramids represent trophic structure such as number, biomass, or energy, not feeding relationships directly. Feeding relationships are better shown by food chains and food webs.
Ecological pyramids represent trophic structure such as number, biomass, or energy, not feeding relationships directly. Feeding relationships are better shown by food chains and food webs.
Which of the following pollutants is most closely associated with biomagnification in food chains?
- A. Biodegradable sewage
- B. DDT
- C. Carbon dioxide
- D. Oxygen
Answer: B. DDT
DDT is a non-biodegradable pesticide that accumulates in organisms and increases in concentration at higher trophic levels. This process is called biomagnification.
DDT is a non-biodegradable pesticide that accumulates in organisms and increases in concentration at higher trophic levels. This process is called biomagnification.