10TH CBSE SCIENCE our environment 50 MCQS QUIZ

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Our Environment

5 Theory-Based MCQ Tests • 10 Questions Each • 50 Questions

Instructions

• There are 5 separate tests with 10 questions in each test.
• Questions are theory/concept based and grounded in the uploaded Our Environment material.
• Submit the test to receive your score.
• Correct answers remain hidden until the password is entered.
• Each question carries 1 mark.

Answer-reveal password is required only after submitting a test.

Test 1 — Ecosystem & Food Chains

10 questions • 1 mark each

1. An ecosystem is best described as an interacting system of:

A. Only plants and animals B. A community and its physical environment C. Only non-living factors D. Only consumers

2. The two main components of an ecosystem are:

A. Producers and consumers B. Biotic and abiotic components C. Plants and decomposers D. Herbivores and carnivores

3. The first trophic level in a food chain is occupied by:

A. Primary consumers B. Secondary consumers C. Producers D. Decomposers

4. The second trophic level is generally occupied by:

A. Herbivores B. Producers C. Decomposers D. Tertiary consumers

5. A food chain represents the transfer of:

A. Only water B. Food energy from one organism to another C. Only oxygen D. Only minerals

6. Green plants form the first link of most food chains because they:

A. Are always the largest organisms B. Can synthesise food using sunlight C. Eat other organisms D. Live only in forests

7. Organisms that feed on dead and decaying matter are called:

A. Producers B. Herbivores C. Decomposers D. Primary consumers

8. Trophic levels are formed by organisms that are:

A. Linked in a food chain B. Found only in water C. Only microorganisms D. Only plants

9. A natural sequence of organisms through which food and energy pass is called a:

A. Food chain B. Population C. Biome D. Community

10. The ultimate source of energy for most ecosystems is the:

A. Soil B. Moon C. Sun D. Wind

Correct answers are locked.

Test 2 — Energy Flow & Trophic Levels

10 questions • 1 mark each

1. The flow of energy in an ecosystem is:

A. Bidirectional B. Unidirectional C. Circular D. Random

2. Approximately what percentage of energy is transferred from one trophic level to the next?

A. 1% B. 10% C. 50% D. 90%

3. Most of the remaining energy at a trophic level is:

A. Stored permanently B. Lost as heat and used in life processes C. Returned to the Sun D. Converted into soil

4. As one moves to higher trophic levels, the available energy generally:

A. Increases B. Remains the same C. Decreases D. Becomes unlimited

5. The trophic level with maximum available energy is usually the:

A. Producer level B. Primary consumer level C. Secondary consumer level D. Tertiary consumer level

6. A decrease in available energy at successive trophic levels limits the:

A. Number of producers B. Number of trophic levels in a food chain C. Amount of sunlight D. Size of the Earth

7. If grass is eaten by a grasshopper and the grasshopper is eaten by a frog, energy moves from:

A. Secondary consumer to producer B. Producer to primary consumer C. Primary consumer to secondary consumer D. Decomposer to producer

8. In the chain Grass → Deer → Lion, deer represents the:

A. Producer level B. Primary consumer level C. Decomposer level D. Tertiary producer level

9. The reason higher trophic levels contain less available energy is mainly related to:

A. Energy loss during transfer and life processes B. Increase in sunlight C. Increase in soil fertility D. Decrease in oxygen only

10. The importance of an ecosystem includes both:

A. Flow of energy and cycling of nutrients B. Only food production C. Only decomposition D. Only population growth

Correct answers are locked.

Test 3 — Biodegradable Waste & Decomposers

10 questions • 1 mark each

1. A biodegradable substance is one that can be:

A. Broken down by decomposers B. Stored permanently in soil C. Never changed naturally D. Converted into plastic

2. Which type of material generally persists because decomposers cannot break it down easily?

A. Biodegradable material B. Non-biodegradable material C. Fresh food D. Plant waste

3. Decomposers help the ecosystem mainly by:

A. Stopping all food chains B. Breaking down dead organic matter and returning nutrients C. Producing plastic D. Removing all sunlight

4. In natural ecosystems, important decomposers include:

A. Bacteria and fungi B. Only lions C. Only grasses D. Only fish

5. Plastic is classified as:

A. Biodegradable B. Non-biodegradable C. A producer D. A decomposer

6. Food waste, fruit peels and vegetable peels can be converted into:

A. Plastic B. Compost C. Metal D. CFCs

7. Waste should be segregated into:

A. Dry and wet waste B. Only plastic and glass C. Only organic waste D. Only liquid waste

8. Recycling plastic waste involves sending used plastic articles for processing so that they can be:

A. Burned into sunlight B. Melted and remoulded into new articles C. Converted into food D. Changed into oxygen

9. A major environmental problem caused by non-biodegradable waste is that it:

A. Decomposes immediately B. Persists and accumulates in the environment C. Always improves soil fertility D. Produces unlimited oxygen

10. Composting is most appropriate for:

A. Biodegradable domestic waste B. Glass bottles C. Metal cans D. Plastic containers

Correct answers are locked.

Test 4 — Ozone Layer & Environmental Protection

10 questions • 1 mark each

1. The ozone layer protects living organisms mainly from:

A. Visible light B. Harmful ultraviolet radiation C. Sound waves D. Radio waves

2. The ozone layer is mainly associated with the:

A. Stratosphere B. Troposphere C. Hydrosphere D. Lithosphere

3. The depletion of the ozone layer is mainly associated with:

A. Chlorofluorocarbons B. Oxygen alone C. Water vapour only D. Nitrogen gas

4. An ozone hole refers to a:

A. Physical hole in the atmosphere B. Decrease in the concentration of ozone C. Increase in oxygen concentration D. Cloud-free region

5. Increased exposure to harmful ultraviolet radiation can cause:

A. Skin cancer B. Improved immunity C. Increased soil fertility D. More rainfall

6. CFCs can contribute to ozone depletion because they:

A. Release substances that participate in ozone-destroying reactions B. Increase plant growth directly C. Convert ozone into oxygen through photosynthesis D. Prevent sunlight from reaching Earth

7. The ozone layer acts as a protective:

A. Shield against harmful UV radiation B. Source of fossil fuels C. Food chain D. Decomposer

8. Limiting the release of ozone-depleting substances helps to:

A. Reduce ozone depletion B. Increase plastic waste C. Stop decomposition D. Increase harmful UV radiation

9. A reduction in atmospheric ozone can allow more:

A. Harmful UV radiation to reach Earth B. Nutrients to enter soil C. Oxygen to disappear from oceans D. Food energy to circulate

10. The environmental concern associated with ozone depletion is important because UV radiation can harm:

A. Only plants B. Only animals C. Living organisms including humans D. Only decomposers

Correct answers are locked.

Test 5 — Biomagnification, Conservation & Sustainable Practices

10 questions • 1 mark each

1. Biological magnification refers to the progressive increase of:

A. Harmful substances through successive trophic levels B. Water through soil layers C. Oxygen in plants D. Energy at higher trophic levels

2. Biological magnification is particularly associated with substances that:

A. Are readily metabolised and excreted B. Persist and accumulate in organisms C. Are always biodegradable D. Are essential nutrients

3. In an aquatic food chain, the highest concentration of a persistent pesticide is expected at the:

A. Producer level B. Lowest trophic level C. Highest trophic level D. Decomposer level only

4. In a food chain ending with humans, harmful non-biodegradable chemicals may reach high concentrations in humans because humans can occupy the:

A. Producer level B. Apex or higher trophic level C. First trophic level D. Decomposer level

5. If deer disappear from Grass → Deer → Tiger, the likely immediate effect is:

A. Grass decreases and tiger increases B. Grass increases and tiger decreases C. Both grass and tiger increase D. Both grass and tiger decrease

6. Destroying a forest can destroy:

A. Only trees B. Only wildlife C. The forest ecosystem D. Only soil

7. Afforestation can help sustain underground water because vegetation:

A. Prevents water from immediately rushing away and supports infiltration B. Stops all rainfall C. Eliminates groundwater D. Makes rivers disappear

8. An environment-friendly shopping practice mentioned in the source is:

A. Using cloth or jute bags B. Using more polythene bags C. Increasing disposable plastics D. Burning all waste

9. An artificial ecosystem among the following is:

A. Forest B. Grassland C. Aquarium D. Desert

10. Environment-friendly practices include:

A. Using reusable bags and avoiding unnecessary energy use B. Increasing disposable plastics C. Leaving lights and fans on unnecessarily D. Increasing waste generation

Correct answers are locked.