Our Environment
Gujarat Board · Class 10 · Science
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Quick Quiz: Our Environment
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What is an ecosystem?
In a food chain: Grass → Goat → Lion, which organism is the secondary consumer?
What percentage of energy is typically transferred from one trophic level to the next?
Ozone in the upper atmosphere protects us from which type of radiation?
Sample Questions
Which of the following are examples of producers in an ecosystem?
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Green plants, Algae, Bacteria that can photosynthesize
Producers are organisms that can make their own food using sunlight through photosynthesis. Green plants, algae, and photosynthetic bacteria all have chlorophyll and can produce organic compounds from inorganic substances using solar energy.
Which of the following statements about decomposers are correct?
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They break down dead organisms, They include bacteria and fungi, They recycle nutrients back to soil
Decomposers like bacteria and fungi break down dead remains and waste products of organisms, converting complex organic substances into simple inorganic substances that enrich the soil. They do not produce their own food or act as primary consumers.
Which of these materials are biodegradable?
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Vegetable peels, Paper, Cotton cloth
Biodegradable substances are those that can be broken down by biological processes (bacteria and other microorganisms). Vegetable peels, paper, and cotton are natural materials that decompose easily. Plastic and glass are non-biodegradable.
What is biological magnification?
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Accumulation of harmful chemicals at each trophic level
Biological magnification is the progressive accumulation of non-degradable harmful chemicals like pesticides at each trophic level. Since these chemicals cannot be broken down, their concentration increases as we move up the food chain.
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