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Karnataka SSLC (Class 10) Our Environment — practice questions

Explore 15 free Our Environment questions in Karnataka SSLC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Our Environment questions and exercises with answers

Showing questions 1–15 of 15.

All the interacting organisms in an area together with the non-living components of the environment form a(n)Read the answer and worked solution →In an ecosystem, green plants are classified asRead the answer and worked solution →Bacteria and fungi that break down the dead remains of organisms are calledRead the answer and worked solution →A series of organisms feeding on one another forms aRead the answer and worked solution →In a food chain, the green plants (producers) occupy theRead the answer and worked solution →On average, the percentage of energy that is transferred from one trophic level to the next is aboutRead the answer and worked solution →The flow of energy in a food chain isRead the answer and worked solution →Food chains generally have only three or four steps becauseRead the answer and worked solution →The progressive increase in the concentration of harmful, non-degradable chemicals at each higher trophic level is calledRead the answer and worked solution →The ozone layer in the upper atmosphere is important because itRead the answer and worked solution →The chemicals mainly responsible for the depletion of the ozone layer areRead the answer and worked solution →Substances that are broken down by biological processes are said to beRead the answer and worked solution →Which one of the following is a non-biodegradable waste?Read the answer and worked solution →The maximum concentration of accumulated pesticides in a food chain is usually found inRead the answer and worked solution →Rule on these claims about a food chainRead the answer and worked solution →

Worked practice questions

All the interacting organisms in an area together with the non-living components of the environment form a(n)

  1. ecosystem
  2. population
  3. food chain
  4. community
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Correct answer: A. ecosystem

1. Living organisms interact with each other and with their physical surroundings. 2. This whole interacting unit is an **ecosystem** (e.g. a forest, pond or garden). 3. It has biotic (living) and abiotic (non-living) components. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch15 'Our Environment', §15.1_

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In an ecosystem, green plants are classified as

  1. consumers
  2. producers
  3. decomposers
  4. parasites
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Correct answer: B. producers

1. Green plants make their own food by photosynthesis. 2. Because they produce food for the ecosystem, they are the **producers**. 3. Animals are consumers; bacteria and fungi are decomposers. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch15 'Our Environment', §15.1_

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Bacteria and fungi that break down the dead remains of organisms are called

  1. producers
  2. herbivores
  3. decomposers
  4. carnivores
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Correct answer: C. decomposers

1. Dead plants and animals must be broken down and recycled. 2. **Decomposers** (bacteria, fungi) break down dead matter into simple substances that return to the soil. 3. This keeps nutrients cycling in the ecosystem. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch15 'Our Environment', §15.1_

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