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

Decrease in energy at higher trophic levels

Water

Polluted air

2 / 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:

CFCs; rays UV

CFCs; Ozone

UV rays; Diatomic oxygen

Ozone; CFCs

3 / 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

Pollution

Biomagnification

Accumulation

4 / 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 false, but R is true.

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.

5 / 15

Which of the following features relates to biodegradable substances?

Remain inert

May harm the ecosystem

Persist in the environment for long time

Broken down by biological processes

6 / 15

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

Convert organic material to inorganic forms

Act at every trophic level of the food chain

Do not break down organic compounds

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

7 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Producers

Decomposer

Primary consumer

Secondary consumer

8 / 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.

9 / 15

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

Fourth trophic level

Third trophic level

Second trophic level

First trophic level

10 / 15

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

Decomposers

Carnivores

Producers

Herbivores

11 / 15

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

Grass → Deer → Tiger

The population of tigers decreases and the population of grass increases

The population of tigers increases

Tiger will start eating grass

The population of grass decreases

12 / 15

Why do all food chains start with plants?

Because plants are nutritious

Because plants do not require energy

Because plants are easily grown

Because plants can produce their own energy

13 / 15

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

Energy is multidirectional and the matter is bidirectional

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

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?

10,000 J

1000 J

100 J

It will depend on the type of the terrestrial plant

15 / 15

The given figure best represents:

Food chain in grassland, pond, and forest

Food chain in forest, grassland, and pond

Food chain in pond, forest, and grassland

Food chain in forest, pond, and grassland

Your score is

The average score is 63%

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	biology	100 %	1 minutes 29 seconds	15
4	K	100 %	2 minutes 30 seconds	15
5	aka	100 %	22 minutes 34 seconds	15
6	Biology	93 %	1 minutes 17 seconds	14
7	dddddd	93 %	1 minutes 19 seconds	14
8	Sakshi	93 %	1 minutes 27 seconds	14
9	Hghhy	93 %	1 minutes 28 seconds	14
10	Abhinav. C	93 %	1 minutes 38 seconds	14
11	pawan	93 %	1 minutes 46 seconds	14
12	AKSHARAA	93 %	1 minutes 57 seconds	14
13	manpreet	93 %	2 minutes 22 seconds	14
14	cc	93 %	2 minutes 33 seconds	14
15	Alien	93 %	4 minutes 52 seconds	14
16	shinchan	93 %	5 minutes 6 seconds	14
17	DK	87 %	52 seconds	13
18	tt7hr fy y	87 %	1 minutes 17 seconds	13
19	Z	87 %	1 minutes 23 seconds	13
20	uh	87 %	1 minutes 37 seconds	13
21	manpreet	87 %	1 minutes 37 seconds	13
22	Aditi	87 %	1 minutes 52 seconds	13
23	preety	87 %	1 minutes 57 seconds	13
24	Krisha	87 %	2 minutes 50 seconds	13
25	isu	87 %	4 minutes 50 seconds	13
26	ladleeeeeeeeeeeee	87 %	5 minutes	13
27	Amit	87 %	5 minutes 15 seconds	13
28	rose	87 %	6 minutes 1 seconds	13
29	Ayushman	87 %	6 minutes 5 seconds	13
30	s	87 %	7 minutes 20 seconds	13
31	MSA	87 %	8 minutes 21 seconds	13
32	ff	87 %	9 minutes 32 seconds	13
33	Kevin	87 %	13 minutes 12 seconds	13
34	S	87 %	26 minutes 51 seconds	13
35	DK	80 %	1 minutes 3 seconds	12
36	DK	80 %	1 minutes 23 seconds	12
37	xxx	80 %	1 minutes 32 seconds	12
38	yash	80 %	1 minutes 49 seconds	12
39	Biology	80 %	2 minutes 38 seconds	12
40	isu	80 %	2 minutes 58 seconds	12
41	r	80 %	3 minutes 39 seconds	12
42	Suba	80 %	4 minutes 14 seconds	12
43	Yash Kushwaha	80 %	4 minutes 37 seconds	12
44	abb	80 %	5 minutes 7 seconds	12
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48	k	80 %	5 minutes 36 seconds	12
49	nehmad and gulu	80 %	7 minutes 17 seconds	12
50	A	73 %	1 minutes 13 seconds	11
51	ffff	73 %	2 minutes 54 seconds	11
52	dgryj	73 %	3 minutes 6 seconds	11
53	Karthick	73 %	3 minutes 13 seconds	11
54	Abhinav. C	73 %	4 minutes 3 seconds	11
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56	Tanishka	73 %	4 minutes 32 seconds	11
57	Rijjakjot	73 %	6 minutes 21 seconds	11
58	Pooja	73 %	9 minutes 15 seconds	11
59	S	73 %	2 hours 56 minutes 44 seconds	11
60	Djfu	67 %	1 minutes 53 seconds	10
61	Name	67 %	3 minutes 7 seconds	10
62	Maria	67 %	3 minutes 28 seconds	10
63	dvsd	67 %	3 minutes 43 seconds	10
64	Zer	67 %	3 minutes 51 seconds	10
65	Arpan	67 %	4 minutes 14 seconds	10
66	asdfghjk	67 %	4 minutes 51 seconds	10
67	Tk	67 %	5 minutes 25 seconds	10
68	j	67 %	5 minutes 48 seconds	10
69	Aafreen	67 %	6 minutes 9 seconds	10
70	Shradhanjali Behera	67 %	6 minutes 21 seconds	10
71	aaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh	67 %	8 minutes 22 seconds	10
72	Siddhi Panchal	67 %	9 minutes 12 seconds	10
73	pragna	67 %	9 minutes 41 seconds	10
74	cc	67 %	10 minutes 9 seconds	10
75	k	67 %	11 minutes 19 seconds	10
76	seerat	67 %	11 minutes 53 seconds	10
77	Anurag	67 %	15 minutes 12 seconds	10
78	DK	60 %	1 minutes 50 seconds	9
79	kushal	60 %	2 minutes 31 seconds	9
80	sanchit	60 %	2 minutes 45 seconds	9
81	m	60 %	2 minutes 49 seconds	9
82	Roya	60 %	3 minutes 20 seconds	9
83	ghfgh	60 %	4 minutes 20 seconds	9
84	Jh	60 %	4 minutes 29 seconds	9
85	K	60 %	4 minutes 35 seconds	9
86	abcd	60 %	5 minutes 35 seconds	9
87	Sachi B Patel	60 %	5 minutes 37 seconds	9
88	Amritha	60 %	5 minutes 40 seconds	9
89	naimish	60 %	7 minutes 3 seconds	9
90	yes	60 %	8 minutes 17 seconds	9
91	adarsh	60 %	12 minutes 23 seconds	9
92	indu	60 %	16 minutes	9
93	GIIS	60 %	58 minutes 11 seconds	9
94	ghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiihhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhl	53 %	1 minutes 45 seconds	8
95	Hiii	53 %	2 minutes 59 seconds	8
96	Sukriti	53 %	3 minutes 5 seconds	8
97	E	53 %	3 minutes 7 seconds	8
98	arag	53 %	3 minutes 21 seconds	8
99	sddddddddd	53 %	3 minutes 34 seconds	8
100	T	53 %	3 minutes 41 seconds	8
101	yash yadav	53 %	3 minutes 52 seconds	8
102	66	53 %	4 minutes 38 seconds	8
103	..	53 %	4 minutes 50 seconds	8
104	Ayushman	53 %	5 minutes 55 seconds	8
105	Mk	53 %	5 minutes 57 seconds	8
106	Big	53 %	7 minutes 21 seconds	8
107	udit kumar	53 %	7 minutes 50 seconds	8
108	Suhani	53 %	8 minutes 33 seconds	8
109	nitudii	53 %	11 minutes 30 seconds	8
110	Santosh	53 %	20 minutes 47 seconds	8
111	s	53 %	37 minutes 44 seconds	8
112	Hani	47 %	2 minutes 9 seconds	7
113	AKSHARAA.S	47 %	2 minutes 46 seconds	7
114	Bhagat	47 %	2 minutes 51 seconds	7
115	Bazil	47 %	3 minutes 51 seconds	7
116	utkarsh sharma	47 %	4 minutes 23 seconds	7
117	Assha	47 %	4 minutes 36 seconds	7
118	Anushka	47 %	4 minutes 51 seconds	7
119	aahhhhhhhhhhhhhhhhh	47 %	5 minutes 12 seconds	7
120	pawan	47 %	5 minutes 49 seconds	7
121	Ghr	47 %	6 minutes 7 seconds	7
122	manpreet singh	47 %	6 minutes 55 seconds	7
123	Ashki Kumari	47 %	7 minutes 9 seconds	7
124	jfk	47 %	7 minutes 13 seconds	7
125	Palak gupta	47 %	7 minutes 34 seconds	7
126	Sam	47 %	8 minutes 37 seconds	7
127	sanchit	47 %	12 minutes 23 seconds	7
128	1234	47 %	15 minutes 25 seconds	7
129	Mahmood	47 %	16 minutes 26 seconds	7
130	saini	47 %	16 minutes 54 seconds	7
131	manpreet	40 %	1 minutes 11 seconds	6
132	A	40 %	2 minutes 27 seconds	6
133	kg	40 %	2 minutes 43 seconds	6
134	K	40 %	2 minutes 48 seconds	6
135	Tut	40 %	3 minutes 35 seconds	6
136	sadawfaf	40 %	3 minutes 50 seconds	6
137	Anu	40 %	5 minutes 13 seconds	6
138	kriti	40 %	5 minutes 33 seconds	6
139	A	40 %	6 minutes 3 seconds	6
140	Pranjal	40 %	6 minutes 16 seconds	6
141	jay	40 %	6 minutes 47 seconds	6
142	Riya	40 %	6 minutes 51 seconds	6
143	pawan	40 %	7 minutes 9 seconds	6
144	Ruth	40 %	13 minutes 22 seconds	6
145	Javeed	40 %	16 minutes 36 seconds	6
146	gujjar	33 %	2 minutes 12 seconds	5
147	Woman	33 %	3 minutes 26 seconds	5
148	R sudarshan	33 %	5 minutes 42 seconds	5
149	Nik	33 %	8 minutes 39 seconds	5
150	Minu	33 %	13 minutes 24 seconds	5
151	Biv	27 %	38 seconds	4
152	devansh	27 %	6 minutes	4
153	Bazil	27 %	17 minutes 53 seconds	4
154	inzmam	13 %	1 minutes 8 seconds	2
155	Google maps	13 %	5 minutes 52 seconds	2
156	S	7 %	36 seconds	1
157	Harshit	7 %	2 minutes 50 seconds	1
158	DK	0 %	54 seconds	0

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 Modals: Rules, Examples, and Practice

About the Quiz

Why Take This Quiz?

Leaderboard – Top Scorers

Key Topics Covered in the Quiz

More Class 10 Science MCQ Quizzes

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