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CBSE Class 3  >  Class 3 Test  >  Social Science Olympiad  >  Test: Our Environment - 2 - Class 3 MCQ

Our Environment - 2 - Free MCQ Practice Test with solutions, Class 3 SST


MCQ Practice Test & Solutions: Test: Our Environment - 2 (10 Questions)

You can prepare effectively for Class 3 Social Science Olympiad for Class 3 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Our Environment - 2". These 10 questions have been designed by the experts with the latest curriculum of Class 3 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Our Environment - 2 - Question 1
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What is the primary cause of global warming?

Detailed Solution: Question 1

Global warming is primarily caused by the increase in greenhouse gases, such as carbon dioxide and methane, in the Earth's atmosphere. These gases trap heat from the sun, leading to a rise in global temperatures. An interesting fact is that carbon dioxide levels in the atmosphere are higher now than at any point in at least the past 800,000 years.

Test: Our Environment - 2 - Question 2
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Which is a renewable source of energy?

Detailed Solution: Question 2

Solar power is a renewable source of energy because it is abundant and can be replenished naturally. Solar panels convert sunlight into electricity without depleting natural resources. An additional fact is that solar energy is the most abundant energy resource on Earth, with the potential to provide many times the total current energy demand.

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Test: Our Environment - 2 - Question 3
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What is the main function of the ozone layer?

Detailed Solution: Question 3

The main function of the ozone layer is to absorb most of the sun's harmful ultraviolet radiation, protecting living organisms on Earth from its damaging effects. Without the ozone layer, the sun's intense UV radiation would be lethal to many forms of life, especially those exposed to direct sunlight.

Test: Our Environment - 2 - Question 4
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Which of the following practices is NOT environmentally friendly?

Detailed Solution: Question 4

Using single-use plastic bags is not environmentally friendly because they contribute to pollution and are harmful to wildlife. They take hundreds of years to decompose in landfills. In contrast, walking, recycling, and conserving water are all practices that help protect the environment.

Test: Our Environment - 2 - Question 5
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What process do plants use to convert carbon dioxide into oxygen?

Detailed Solution: Question 5

Plants use the process of photosynthesis to convert carbon dioxide into oxygen. This process not only produces oxygen, which is essential for human and animal life, but also removes carbon dioxide, a greenhouse gas, from the atmosphere. Interestingly, about 50% of the Earth's oxygen is produced by phytoplankton in the oceans.

Test: Our Environment - 2 - Question 6
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Which of the following is a consequence of deforestation?

Detailed Solution: Question 6

Deforestation leads to the loss of biodiversity because it destroys the habitats of various species. It also contributes to climate change and disrupts water cycles. An interesting fact is that forests are home to over 80% of terrestrial species of animals, plants, and insects.

Test: Our Environment - 2 - Question 7
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What is the main benefit of recycling?

Detailed Solution: Question 7

The main benefit of recycling is that it reduces waste in landfills. Recycling materials also conserves natural resources, saves energy, and reduces greenhouse gas emissions. Fun fact: Recycling one ton of paper can save 17 trees and 7,000 gallons of water.

Test: Our Environment - 2 - Question 8
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What role do bees play in the ecosystem?

Detailed Solution: Question 8

Bees play a crucial role in the ecosystem through the pollination of plants, which allows for the production of fruits, nuts, and vegetables. This process is vital for the survival of many plant and animal species. Interestingly, bees are responsible for pollinating about one-third of the food crops we consume.

Test: Our Environment - 2 - Question 9
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Why is biodiversity important for an ecosystem?

Detailed Solution: Question 9

Biodiversity is important for an ecosystem because it supports a variety of life forms that work together to maintain balance and resilience. This diversity helps ecosystems adapt to changes and stresses, such as climate change. An interesting fact is that ecosystems with higher biodiversity tend to be more stable and can better withstand environmental pressures.

Test: Our Environment - 2 - Question 10
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What is the primary source of freshwater pollution?

Detailed Solution: Question 10

The primary source of freshwater pollution is industrial waste and chemicals. These pollutants can harm aquatic life, degrade water quality, and pose health risks to humans. An additional fact is that agriculture, with its runoff containing fertilizers and pesticides, is also a major contributor to water pollution.

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About this Class 3 Practice Test

This test contains 10 MCQs on Our Environment - 2 with detailed solutions for each question. It is part of the Social Science Olympiad for Class 3 course on EduRev, designed to align with the current Class 3 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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If you found this Our Environment - 2 MCQ Test helpful, you can further enhance your Class 3 preparation with in-depth courses on EduRev, for all the subjects and topics available in Social Science Olympiad for Class 3 course. The course offers:
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