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CBSE Class 3  >  Class 3 Test  >  Social Science Olympiad  >  Test: Our Environment - 1 - Class 3 MCQ

Our Environment - 1 - Free MCQ Practice Test with solutions, Class 3 SST


MCQ Practice Test & Solutions: Test: Our Environment - 1 (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 - 1". 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

Sign up on EduRev for free to attempt this test and track your preparation progress.

Test: Our Environment - 1 - Question 1
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Global warming is the increasing of average global temperature due to an increase in what?

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, causing the planet's temperature to rise, which is known as the greenhouse effect.

Test: Our Environment - 1 - Question 2
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Fill in the blank. Zooplanktons feed on _______

Detailed Solution: Question 2

Zooplanktons primarily feed on phytoplankton, which are microscopic photosynthetic organisms. This relationship is a key component of aquatic ecosystems, supporting a vast array of marine life.

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Test: Our Environment - 1 - Question 3
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In the given figure, there are four trophic levels. Among them, the level where decomposers fit is-

Detailed Solution: Question 3

Decomposers play a crucial role in breaking down organic matter and are often placed in another separate trophic level of a food web. They recycle nutrients back into the ecosystem, making them available for use by primary producers.

Test: Our Environment - 1 - Question 4
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During photosynthesis, the percentage of solar radiation absorbed by green plants is-

Detailed Solution: Question 4

Only a small percentage of solar radiation (about 1%) is absorbed by green plants during photosynthesis. This energy is used to convert carbon dioxide and water into glucose, a process that is fundamental to life on Earth.

Test: Our Environment - 1 - Question 5
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Which of the following are environment-friendly practices?

Detailed Solution: Question 5

All the mentioned practices contribute to reducing environmental impact and promoting sustainability. Using cloth bags reduces plastic waste, walking cuts down on carbon emissions, and conserving electricity saves energy and reduces greenhouse gas emissions.

Test: Our Environment - 1 - Question 6
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The depletion of the Ozone shield is due to __________.

Detailed Solution: Question 6

Chlorofluorocarbons (CFCs) released into the atmosphere contribute to the depletion of the ozone layer. These compounds break down ozone molecules, reducing the Earth's protection against harmful ultraviolet radiation.

Test: Our Environment - 1 - Question 7
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In an ecosystem, the different food levels are called

Detailed Solution: Question 7

Trophic levels represent the position of organisms in a food chain or web, from primary producers to apex predators. Each level plays a critical role in the flow of energy through an ecosystem.

Test: Our Environment - 1 - Question 8
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Biodegradable wastes can be utilized to produce _____________.

Detailed Solution: Question 8

Biodegradable wastes, like organic matter, can be used to produce biogas through a process called anaerobic digestion. This not only helps in managing waste but also provides a renewable source of energy.

Test: Our Environment - 1 - Question 9
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Identify what is happening in the image below.

Detailed Solution: Question 9

The correct identification is a Forest Fire. Forest fires can be caused by natural factors such as lightning or human activities. They can lead to significant ecological damage but also play a role in the natural cycle of woodland regeneration.

Test: Our Environment - 1 - Question 10
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The solid waste collected from all our houses is thrown out of the city in a place called-

Detailed Solution: Question 10

Landfills are designated areas where solid waste is disposed of, often buried under the soil. This method of waste management prevents contamination of water and air but requires careful management to avoid environmental harm.

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About this Class 3 Practice Test

This test contains 10 MCQs on Our Environment - 1 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 - 1 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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  • MCQ Test: variety of questions as per the pattern of Class 3 exam
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