Class 10 Practice Level 3 – Our Environment – Set – 1

Total questions: 15

How does biomagnification differ from bioaccumulation?

Topic: Bioaccumulation and Biomagnification

Biomagnification occurs at the individual level, while bioaccumulation occurs at the population level.

Bioaccumulation refers to the buildup of toxins in a single organism, while biomagnification refers to the increase in toxin concentration as it moves up the food chain.

Bioaccumulation is the process of toxin concentration decreasing up the food chain, while biomagnification is the process of toxin concentration increasing in an individual.

Biomagnification and bioaccumulation are identical processes.

None

What is the primary difference between primary and secondary succession?

Topic: Ecological Succession

Primary succession occurs in an area where no soil previously existed, while secondary succession occurs in an area where soil is already present.

Primary succession occurs faster than secondary succession.

Secondary succession occurs in an area where no soil previously existed, while primary succession occurs where soil is already present.

There is no difference between primary and secondary succession.

None

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

Topic: Ecosystem Services

Food production

Water purification

Recreation

Raw materials

None

Why are keystone species crucial for maintaining biodiversity in an ecosystem?

Topic: Keystone Species

They are the most abundant species in an ecosystem.

Their removal can lead to significant changes and destabilize the ecosystem.

They are at the bottom of the food chain.

They only interact with a few other species.

None

Which of the following processes is not part of the carbon cycle?

Topic: Biogeochemical Cycles

Photosynthesis

Respiration

Combustion

Nitrogen fixation

None

How does habitat fragmentation affect biodiversity?

Topic: Habitat Fragmentation

It increases genetic diversity within populations.

It creates continuous habitats for species.

It leads to smaller, isolated populations, increasing the risk of extinction.

It has no significant impact on biodiversity.

None

What human activity is primarily responsible for ozone layer depletion?

Topic: Ozone Layer

Overuse of fertilizers

Emission of chlorofluorocarbons (CFCs)

Deforestation

Excessive water use

None

What is the primary cause of eutrophication in water bodies?

Topic: Eutrophication

Low nutrient levels

High levels of nutrients, especially nitrogen and phosphorus

Increased oxygen levels

Presence of invasive species

None

Which of the following is a primary greenhouse gas contributing to global warming?

Topic: Greenhouse Gases

Oxygen

Methane

Nitrogen

Helium

None

10.

What is the main goal of sustainable development?

Topic: Sustainable Development

To achieve maximum economic growth regardless of environmental impact.

To meet the needs of the present without compromising the ability of future generations to meet their own needs.

To exploit natural resources as quickly as possible.

To focus solely on environmental conservation without considering human needs.

None

11.

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

Topic: Climate Change Mitigation

Increasing the use of coal-fired power plants

Deforestation

Promoting renewable energy sources

Reducing energy efficiency

None

12.

Which practice helps prevent soil erosion?

Topic: Soil Conservation

Overgrazing

Contour ploughing

Clear-cutting forests

Monoculture farming

None

13.

What is a major consequence of marine pollution?

Topic: Marine Pollution

Increased biodiversity

Degradation of marine habitats

Improved water quality

Enhanced fish populations

None

14.

What does an ecological footprint measure?

Topic: Ecological Footprint

The number of species in an ecosystem

The impact of human activities on the environment in terms of resource consumption and waste production

The total area of an ecosystem

The biodiversity of a region

None

15.

How do invasive species threaten biodiversity?

Topic: Invasive Species

They increase the genetic diversity of native species.

They help maintain ecological balance.

They outcompete native species for resources, leading to declines or extinctions.

They have no significant impact on native species.

None

1 out of 15

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Class 10 Practice Level 3 – Our Environment – Set – 1

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