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

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

Less availability of food

Polluted air

Decrease in energy at higher trophic levels

Water

2 / 15

The given figure best represents:

Food chain in forest, grassland, and pond

Food chain in forest, pond, and grassland

Food chain in pond, forest, and grassland

Food chain in grassland, pond, and forest

3 / 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

5000 kJ

50 kJ

500 kJ

4 / 15

Which trophic level is incorrectly defined?

Carnivores – Secondary or tertiary consumers

Herbivores – primary consumers

Omnivores – molds, yeast, and mushrooms

Decomposers – microbial heterotrophs

5 / 15

Which of the following features relates to biodegradable substances?

Broken down by biological processes

Remain inert

Persist in the environment for long time

May harm the ecosystem

6 / 15

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

Grass → Deer → Tiger

Tiger will start eating grass

The population of tigers increases

The population of grass decreases

The population of tigers decreases and the population of grass increases

7 / 15

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

A and B

D and F

B and D

A and C

8 / 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:

Accumulation

Eutrophication

Biomagnification

Pollution

9 / 15

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

Do not break down organic compounds

Convert organic material to inorganic forms

Act at every trophic level of the food chain

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

10 / 15

Also See: CBSE Practical Exam Guidelines for Supplementary Exam 2025 (Class 10 & 12)

Observe the food web and answer the questions given below:

The mussel can be described as

Secondary consumer

Primary consumer

Producers

Decomposer

11 / 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.

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

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

A is false, but R is true.

A is true, but R is false.

12 / 15

Why do all food chains start with plants?

Because plants are easily grown

Because plants can produce their own energy

Because plants are nutritious

Because plants do not require energy

13 / 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.

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

A is true but R is false.

A is false but R is true.

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

14 / 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

1000 J

100 J

10,000 J

15 / 15

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

Third trophic level

Second trophic level

Fourth trophic level

First trophic level

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
12	Alien	93 %	4 minutes 52 seconds	14
13	shinchan	93 %	5 minutes 6 seconds	14
14	tt7hr fy y	87 %	1 minutes 17 seconds	13
15	Z	87 %	1 minutes 23 seconds	13
16	uh	87 %	1 minutes 37 seconds	13
17	manpreet	87 %	1 minutes 37 seconds	13
18	Aditi	87 %	1 minutes 52 seconds	13
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21	ladleeeeeeeeeeeee	87 %	5 minutes	13
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25	MSA	87 %	8 minutes 21 seconds	13
26	ff	87 %	9 minutes 32 seconds	13
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28	S	87 %	26 minutes 51 seconds	13
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80	Hiii	53 %	2 minutes 59 seconds	8
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82	E	53 %	3 minutes 7 seconds	8
83	arag	53 %	3 minutes 21 seconds	8
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85	T	53 %	3 minutes 41 seconds	8
86	66	53 %	4 minutes 38 seconds	8
87	..	53 %	4 minutes 50 seconds	8
88	Ayushman	53 %	5 minutes 55 seconds	8
89	Mk	53 %	5 minutes 57 seconds	8
90	Big	53 %	7 minutes 21 seconds	8
91	udit kumar	53 %	7 minutes 50 seconds	8
92	Suhani	53 %	8 minutes 33 seconds	8
93	Santosh	53 %	20 minutes 47 seconds	8
94	Hani	47 %	2 minutes 9 seconds	7
95	AKSHARAA.S	47 %	2 minutes 46 seconds	7
96	Bhagat	47 %	2 minutes 51 seconds	7
97	Bazil	47 %	3 minutes 51 seconds	7
98	utkarsh sharma	47 %	4 minutes 23 seconds	7
99	Assha	47 %	4 minutes 36 seconds	7
100	Anushka	47 %	4 minutes 51 seconds	7
101	aahhhhhhhhhhhhhhhhh	47 %	5 minutes 12 seconds	7
102	pawan	47 %	5 minutes 49 seconds	7
103	Ghr	47 %	6 minutes 7 seconds	7
104	manpreet singh	47 %	6 minutes 55 seconds	7
105	Ashki Kumari	47 %	7 minutes 9 seconds	7
106	jfk	47 %	7 minutes 13 seconds	7
107	Palak gupta	47 %	7 minutes 34 seconds	7
108	sanchit	47 %	12 minutes 23 seconds	7
109	1234	47 %	15 minutes 25 seconds	7
110	Mahmood	47 %	16 minutes 26 seconds	7
111	saini	47 %	16 minutes 54 seconds	7
112	manpreet	40 %	1 minutes 11 seconds	6
113	A	40 %	2 minutes 27 seconds	6
114	kg	40 %	2 minutes 43 seconds	6
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127	gujjar	33 %	2 minutes 12 seconds	5
128	R sudarshan	33 %	5 minutes 42 seconds	5
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131	Biv	27 %	38 seconds	4
132	devansh	27 %	6 minutes	4
133	Bazil	27 %	17 minutes 53 seconds	4
134	inzmam	13 %	1 minutes 8 seconds	2
135	Google maps	13 %	5 minutes 52 seconds	2
136	S	7 %	36 seconds	1
137	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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