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

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

A and C

B and D

A and B

D and F

2 / 15

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

Decrease in energy at higher trophic levels

Polluted air

Less availability of food

Water

3 / 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?

10,000 J

100 J

It will depend on the type of the terrestrial plant

1000 J

4 / 15

What will happen if deer is missing from the food chain given below?

Grass → Deer → Tiger

The population of grass decreases

The population of tigers increases

The population of tigers decreases and the population of grass increases

Tiger will start eating grass

5 / 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:

Eutrophication

Biomagnification

Pollution

Accumulation

6 / 15

Why do all food chains start with plants?

Because plants can produce their own energy

Because plants do not require energy

Because plants are nutritious

Because plants are easily grown

7 / 15

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

Carnivores

Producers

Decomposers

Herbivores

8 / 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

50 kJ

500 kJ

5000 kJ

5 kJ

9 / 15

Assertion: Biodegradable substances result in the formation of compost and natural replenishment.

Reason: It is due to the breakdown of complex inorganic substances into simple organic substances.

A is true but R is false.

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

A is false but R is true.

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

10 / 15

If Ravi is consuming curd/yogurt for lunch, which trophic level in a food chain he should be considered as occupying?

Second trophic level

First trophic level

Third trophic level

Fourth trophic level

11 / 15

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

Act at every trophic level of the food chain

Convert organic material to inorganic forms

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

Do not break down organic compounds

12 / 15

Assertion: The food chain is responsible for the entry of harmful chemicals into our bodies.

Reason: The length and complexity of food chains vary greatly.

A is true, but R is false.

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 false, but R is true.

13 / 15

In 1987, an agreement was formulated by the United Nations Environment Programme (UNEP) to freeze the production of “X” to prevent the depletion of “Y”. “X” and “Y” respectively referred to here are:

UV rays; Diatomic oxygen

Ozone; CFCs

CFCs; Ozone

CFCs; rays UV

14 / 15

The given figure best represents:

Food chain in forest, grassland, and pond

Food chain in pond, forest, and grassland

Food chain in grassland, pond, and forest

Food chain in forest, pond, and grassland

15 / 15

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

Producer to decomposer

Producer to primary consumer

Primary consumer to secondary consumer

Secondary consumer to environment

Your score is

The average score is 62%

Leaderboard – Top Scorers

Check out the highest scorers below!

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
5	Sakshi	93 %	1 minutes 27 seconds	14
6	Hghhy	93 %	1 minutes 28 seconds	14
7	Abhinav. C	93 %	1 minutes 38 seconds	14
8	pawan	93 %	1 minutes 46 seconds	14
9	AKSHARAA	93 %	1 minutes 57 seconds	14
10	manpreet	93 %	2 minutes 22 seconds	14
11	cc	93 %	2 minutes 33 seconds	14
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91	Big	53 %	7 minutes 21 seconds	8
92	udit kumar	53 %	7 minutes 50 seconds	8
93	Suhani	53 %	8 minutes 33 seconds	8
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95	Hani	47 %	2 minutes 9 seconds	7
96	AKSHARAA.S	47 %	2 minutes 46 seconds	7
97	Bhagat	47 %	2 minutes 51 seconds	7
98	Bazil	47 %	3 minutes 51 seconds	7
99	utkarsh sharma	47 %	4 minutes 23 seconds	7
100	Assha	47 %	4 minutes 36 seconds	7
101	Anushka	47 %	4 minutes 51 seconds	7
102	aahhhhhhhhhhhhhhhhh	47 %	5 minutes 12 seconds	7
103	pawan	47 %	5 minutes 49 seconds	7
104	Ghr	47 %	6 minutes 7 seconds	7
105	manpreet singh	47 %	6 minutes 55 seconds	7
106	Ashki Kumari	47 %	7 minutes 9 seconds	7
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109	sanchit	47 %	12 minutes 23 seconds	7
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111	Mahmood	47 %	16 minutes 26 seconds	7
112	saini	47 %	16 minutes 54 seconds	7
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131	Minu	33 %	13 minutes 24 seconds	5
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134	Bazil	27 %	17 minutes 53 seconds	4
135	inzmam	13 %	1 minutes 8 seconds	2
136	Google maps	13 %	5 minutes 52 seconds	2
137	S	7 %	36 seconds	1
138	Harshit	7 %	2 minutes 50 seconds	1

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: How Do Organisms Reproduce? Class 10 Science MCQ Quiz – Test Your Knowledge

About the Quiz

Why Take This Quiz?

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Key Topics Covered in the Quiz

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