Our Environment Class 10 Science MCQ Quiz – Test Your Knowledge

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Are you ready to test your knowledge of Our Environment? This chapter focuses on ecosystem components, food chains, trophic levels, ozone layer depletion, and waste management—important topics for your CBSE Class 10 Science exam.

About the Quiz

Chapter Name: Our Environment
Subject: Science (Biology)
Book: NCERT Class 10 Science
Question Type: Multiple Choice Questions (MCQs)
Leaderboard: Yes (Compete with Others!)

Why Take This Quiz?

✔ Helps in quick revision for board exams
✔ Covers important NCERT-based questions
✔ Leaderboard feature to track your performance

Click Below to Start the Quiz!

Chapter 13 - Our Environment

1 / 15

Matter and energy are two fundamental inputs of an ecosystem. Movement of

Energy is bidirectional and the matter is repeatedly circulating

Energy is unidirectional and the matter is repeatedly circulating

Energy is repeatedly circulation and the matter is unidirectional

Energy is multidirectional and the matter is bidirectional

2 / 15

If a deer is eaten by a tiger, then the energy transfer will be from

Secondary consumer to environment

Producer to decomposer

Primary consumer to secondary consumer

Producer to primary consumer

3 / 15

Which of the following limits the number of trophic levels in a food chain?

Water

Polluted air

Less availability of food

Decrease in energy at higher trophic levels

4 / 15

Which of the following organisms convert organic material to inorganic forms?

Producers

Decomposers

Carnivores

Herbivores

5 / 15

In the food web, what two organisms are competing for food?

D and F

A and B

A and C

B and D

6 / 15

In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?

Grass → Grasshopper → Frog → Snake → Hawk

5 kJ

500 kJ

50 kJ

5000 kJ

7 / 15

If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?

It will depend on the type of the terrestrial plant

10,000 J

1000 J

100 J

8 / 15

The given figure best represents:

Food chain in forest, grassland, and pond

Food chain in grassland, pond, and forest

Food chain in forest, pond, and grassland

Food chain in pond, forest, and grassland

9 / 15

Assertion: A greater number of individuals are present in lower trophic levels.

Reason: The flow of energy is unidirectional.

Both A and R are true, and R is the correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

10 / 15

Which trophic level is incorrectly defined?

Decomposers – microbial heterotrophs

Herbivores – primary consumers

Carnivores – Secondary or tertiary consumers

Omnivores – molds, yeast, and mushrooms

11 / 15

The chemicals that are non-degradable, get progressively accumulated at each trophic level, and their concentration is seen maximum in the bodies of top consumers. This phenomenon is known as:

Biomagnification

Eutrophication

Pollution

Accumulation

12 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Decomposer

Secondary consumer

Primary consumer

Producers

13 / 15

The decomposers are not included in the food chain. The correct reason for the same is because decomposers:

Release enzymes outside their body to convert organic material to inorganic forms

Act at every trophic level of the food chain

Do not break down organic compounds

Convert organic material to inorganic forms

14 / 15

Which of the following features relates to biodegradable substances?

May harm the ecosystem

Remain inert

Broken down by biological processes

Persist in the environment for long time

15 / 15

Why do all food chains start with plants?

Because plants do not require energy

Because plants are easily grown

Because plants are nutritious

Because plants can produce their own energy

Your score is

The average score is 62%

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Pos.	Name	Score	Duration	Points
1	Khushi	100 %	54 seconds	15
2	naimish	100 %	1 minutes 8 seconds	15
3	aka	100 %	22 minutes 34 seconds	15
4	dddddd	93 %	1 minutes 19 seconds	14
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102	sanchit	47 %	12 minutes 23 seconds	7
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130	S	7 %	36 seconds	1
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Key Topics Covered in the Quiz

✔ Ecosystem and Its Components
✔ Food Chain & Food Web
✔ Trophic Levels and Energy Flow
✔ Biodegradable & Non-Biodegradable Substances
✔ Ozone Layer & Its Depletion
✔ Waste Management & Sustainable Development

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Also See: CBSE Class 10 Science Syllabus 2025-26: Download PDF & Full Exam Pattern

About the Quiz

Why Take This Quiz?

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Key Topics Covered in the Quiz

More Class 10 Science MCQ Quizzes

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