Class 10 Practice Level 2 - Set 1 - Our Environment

Total questions: 25

How do keystone species affect an ecosystem?

Topic: Ecosystem Balance

They have little impact on the ecosystem.

Their removal leads to significant changes in the ecosystem.

They only affect one species in the ecosystem.

They control the climate of the ecosystem.

None

What is biomagnification?

Topic: Biomagnification

The reduction of pollutants in an organism.

The increase in concentration of pollutants in organisms at higher trophic levels.

The process of photosynthesis.

The breakdown of organic matter.

None

What is a food web?

Topic: Food Chain

A simple linear sequence of organisms feeding on each other.

A complex network of interconnected food chains.

A diagram showing only herbivores and carnivores.

A chart of plant species in an ecosystem.

None

Which process in the nitrogen cycle converts nitrogen gas from the atmosphere into a form usable by plants?

Topic: Nitrogen Cycle

Nitrogen fixation

Denitrification

Ammonification

Nitrification

None

What does an energy pyramid represent in an ecosystem?

Topic: Energy Pyramid

The number of organisms at each trophic level.

The total biomass of organisms.

The flow of energy through different trophic levels.

The types of organisms in an ecosystem.

None

What role do decomposers play in an ecosystem?

Topic: Decomposition

They produce oxygen.

They fix nitrogen.

They break down dead organisms and recycle nutrients.

They photosynthesize.

None

What is ecological succession?

Topic: Ecological Succession

The process of maintaining a constant ecosystem.

The gradual replacement of one community by another.

The sudden change in climate of an ecosystem.

The extinction of species in an ecosystem.

None

Which of the following is not a greenhouse gas?

Topic: Greenhouse Gases

Carbon dioxide

Methane

Oxygen

Nitrous oxide

None

In the carbon cycle, how is carbon returned to the atmosphere?

Topic: Carbon Cycle

Through photosynthesis

Through respiration and combustion

Through nitrogen fixation

Through the water cycle

None

10.

Which of the following is an example of biological magnification?

Topic: Biological Magnification

Increase in fish population in a clean lake.

Accumulation of pesticides in the tissues of organisms at higher trophic levels.

Reduction of pollutants through natural filtration.

Decomposition of organic matter.

None

11.

What contributes to the stability of an ecosystem?

Topic: Ecosystem Stability

High biodiversity

Low biodiversity

Increased pollution

Habitat destruction

None

12.

Which of the following is a sustainable practice?

Topic: Sustainable Practices

Overharvesting

Clear-cutting forests

Crop rotation

Pollution

None

13.

Which of the following resources is renewable?

Topic: Renewable vs. Non-Renewable Resources

Coal

Oil

Wind

Natural gas

None

14.

What is the main environmental impact of acid rain?

Topic: Acid Rain

Increased biodiversity

Enhanced soil fertility

Damage to aquatic ecosystems and soil

Improved air quality

None

15.

Which of the following is a consequence of deforestation?

Topic: Deforestation Effects

Increased carbon sequestration

Soil erosion and loss of habitat

Enhanced biodiversity

Cooler climate

None

16.

Which of the following actions helps reduce waste?

Topic: Waste Reduction

Using single-use plastic items

Recycling and composting

Disposing of recyclables in landfills

Ignoring the use of reusable items

None

17.

What is an invasive species?

Topic: Invasive Species

A species that is native to an area and supports ecosystem balance.

A species that is introduced to a new area and disrupts the ecosystem.

A species that is beneficial for agriculture.

A species that is found only in protected areas.

None

18.

Which of the following is a strategy to mitigate climate change?

Topic: Climate Change Mitigation

Increasing fossil fuel consumption

Planting trees (afforestation)

Reducing energy efficiency

Ignoring renewable energy sources

None

19.

Which of the following substances is harmful to the ozone layer?

Topic: Ozone Layer Protection

Water vapor

Carbon dioxide

Chlorofluorocarbons (CFCs)

Methane

None

20.

What causes eutrophication in water bodies?

Topic: Eutrophication

Low levels of nutrients

Excessive nutrient pollution from fertilizers

Increased oxygen levels

Presence of invasive species

None

21.

What is carbon sequestration?

Topic: Carbon Sequestration

The release of carbon dioxide into the atmosphere

The process of capturing and storing atmospheric carbon dioxide

The increase of carbon dioxide levels in the ocean

The conversion of carbon dioxide into methane

None

22.

Which of the following is considered a primary air pollutant?

Topic: Pollutants

Ozone

Sulphur dioxide

Carbon dioxide

Water vapor

None

23.

What is the main goal of wildlife conservation?

Topic: Conservation Efforts

To increase urban development

To protect species and their habitats

To reduce water pollution

To promote deforestation

None

24.

What is overexploitation?

Topic: Overexploitation

Sustainable use of natural resources

Use of renewable resources

Harvesting resources faster than they can be replenished

Increasing biodiversity

None

25.

Which of the following is an example of a regulating ecosystem service?

Topic: Ecosystem Services

Provision of food

Recreational activities

Climate regulation

Cultural heritage

None

1 out of 25

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Class 10 Practice Level 2 - Set 1 - Our Environment

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