StudentAidUnit 25: Ecology — Mcqs
12th Class Biology · Unit 25: Ecology
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MCQ-35.If you study the interaction between a herd of Markhors, the grass they eat, and the snow leopards that hunt them, which level of ecological organization are you focusing on?
MCQ-36.Nitrogen-fixers are present in the group/s;
MCQ-37.In an ecosystem, the energy flow is;
MCQ-38.Absorption and re-emission of heat radiation by the atmosphere is called;
- a Global warming
- b Ozone depletion
- c Acid rain
- d Greenhouse effect
MCQ-39.A population's carrying capacity.
MCQ-40.During energy flow in ecosystems, how much of the energy at a trophic level enters the next level?
MCQ-41.Which group of bacteria is involved in nitrification?
MCQ-42.Which step of nitrogen cycle is accomplished by Pseudomonas?
MCQ-43.How do nitrogen-fixing bacteria contribute to the nitrogen cycle?
- a Return nitrogen (N₂) to the atmosphere
- b Change ammonium to nitrate
- c Change N₂ to ammonium
- d Absorb nitrate from the soil
MCQ-44.According to 2025-2026 climate data, the "Enhanced Greenhouse Effect" is considered as climate injustice for Pakistan because;