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

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.

A is false, but R is true.

A is true, but R is false.

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

2 / 15

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

Herbivores

Carnivores

Producers

Decomposers

3 / 15

Why do all food chains start with plants?

Because plants are nutritious

Because plants can produce their own energy

Because plants do not require energy

Because plants are easily grown

4 / 15

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

Secondary consumer to environment

Primary consumer to secondary consumer

Producer to primary consumer

Producer to decomposer

5 / 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

It will depend on the type of the terrestrial plant

100 J

1000 J

6 / 15

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

Less availability of food

Water

Decrease in energy at higher trophic levels

Polluted air

7 / 15

Which trophic level is incorrectly defined?

Omnivores – molds, yeast, and mushrooms

Carnivores – Secondary or tertiary consumers

Decomposers – microbial heterotrophs

Herbivores – primary consumers

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:

Pollution

Accumulation

Eutrophication

Biomagnification

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.

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

A is false but R is true.

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

A is true but R is false.

10 / 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

11 / 15

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

A and B

A and C

B and D

D and F

12 / 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

Ozone; CFCs

UV rays; Diatomic oxygen

CFCs; Ozone

13 / 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 grass decreases

The population of tigers increases

Tiger will start eating grass

14 / 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

5000 kJ

50 kJ

500 kJ

5 kJ

15 / 15

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

Reason: The flow of energy is unidirectional.

A is false, but R is true.

A is true, but R is false.

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.

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	xxx	87 %	7 minutes 32 seconds	13
32	MSA	87 %	8 minutes 21 seconds	13
33	ff	87 %	9 minutes 32 seconds	13
34	Kevin	87 %	13 minutes 12 seconds	13
35	S	87 %	26 minutes 51 seconds	13
36	DK	80 %	1 minutes 3 seconds	12
37	DK	80 %	1 minutes 23 seconds	12
38	xxx	80 %	1 minutes 32 seconds	12
39	yash	80 %	1 minutes 49 seconds	12
40	Biology	80 %	2 minutes 38 seconds	12
41	isu	80 %	2 minutes 58 seconds	12
42	r	80 %	3 minutes 39 seconds	12
43	Suba	80 %	4 minutes 14 seconds	12
44	Yash Kushwaha	80 %	4 minutes 37 seconds	12
45	abb	80 %	5 minutes 7 seconds	12
46	Sapna	80 %	5 minutes 9 seconds	12
47	K advitha	80 %	5 minutes 30 seconds	12
48	jj	80 %	5 minutes 35 seconds	12
49	k	80 %	5 minutes 36 seconds	12
50	nehmad and gulu	80 %	7 minutes 17 seconds	12
51	A	73 %	1 minutes 13 seconds	11
52	ffff	73 %	2 minutes 54 seconds	11
53	dgryj	73 %	3 minutes 6 seconds	11
54	Karthick	73 %	3 minutes 13 seconds	11
55	Abhinav. C	73 %	4 minutes 3 seconds	11
56	Swara	73 %	4 minutes 20 seconds	11
57	Tanishka	73 %	4 minutes 32 seconds	11
58	Rijjakjot	73 %	6 minutes 21 seconds	11
59	Pooja	73 %	9 minutes 15 seconds	11
60	S	73 %	2 hours 56 minutes 44 seconds	11
61	Djfu	67 %	1 minutes 53 seconds	10
62	Name	67 %	3 minutes 7 seconds	10
63	Maria	67 %	3 minutes 28 seconds	10
64	dvsd	67 %	3 minutes 43 seconds	10
65	Zer	67 %	3 minutes 51 seconds	10
66	Arpan	67 %	4 minutes 14 seconds	10
67	asdfghjk	67 %	4 minutes 51 seconds	10
68	Tk	67 %	5 minutes 25 seconds	10
69	j	67 %	5 minutes 48 seconds	10
70	Aafreen	67 %	6 minutes 9 seconds	10
71	Shradhanjali Behera	67 %	6 minutes 21 seconds	10
72	aaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh	67 %	8 minutes 22 seconds	10
73	Siddhi Panchal	67 %	9 minutes 12 seconds	10
74	pragna	67 %	9 minutes 41 seconds	10
75	cc	67 %	10 minutes 9 seconds	10
76	k	67 %	11 minutes 19 seconds	10
77	seerat	67 %	11 minutes 53 seconds	10
78	Anurag	67 %	15 minutes 12 seconds	10
79	DK	60 %	1 minutes 50 seconds	9
80	kushal	60 %	2 minutes 31 seconds	9
81	sanchit	60 %	2 minutes 45 seconds	9
82	m	60 %	2 minutes 49 seconds	9
83	Roya	60 %	3 minutes 20 seconds	9
84	ghfgh	60 %	4 minutes 20 seconds	9
85	Jh	60 %	4 minutes 29 seconds	9
86	K	60 %	4 minutes 35 seconds	9
87	abcd	60 %	5 minutes 35 seconds	9
88	Sachi B Patel	60 %	5 minutes 37 seconds	9
89	Amritha	60 %	5 minutes 40 seconds	9
90	naimish	60 %	7 minutes 3 seconds	9
91	yes	60 %	8 minutes 17 seconds	9
92	adarsh	60 %	12 minutes 23 seconds	9
93	indu	60 %	16 minutes	9
94	Alina	60 %	47 minutes 22 seconds	9
95	GIIS	60 %	58 minutes 11 seconds	9
96	ghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiihhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhl	53 %	1 minutes 45 seconds	8
97	Hiii	53 %	2 minutes 59 seconds	8
98	Sukriti	53 %	3 minutes 5 seconds	8
99	E	53 %	3 minutes 7 seconds	8
100	arag	53 %	3 minutes 21 seconds	8
101	sddddddddd	53 %	3 minutes 34 seconds	8
102	T	53 %	3 minutes 41 seconds	8
103	yash yadav	53 %	3 minutes 52 seconds	8
104	66	53 %	4 minutes 38 seconds	8
105	..	53 %	4 minutes 50 seconds	8
106	Ayushman	53 %	5 minutes 55 seconds	8
107	Mk	53 %	5 minutes 57 seconds	8
108	Big	53 %	7 minutes 21 seconds	8
109	udit kumar	53 %	7 minutes 50 seconds	8
110	Suhani	53 %	8 minutes 33 seconds	8
111	nitudii	53 %	11 minutes 30 seconds	8
112	Santosh	53 %	20 minutes 47 seconds	8
113	s	53 %	37 minutes 44 seconds	8
114	Hani	47 %	2 minutes 9 seconds	7
115	AKSHARAA.S	47 %	2 minutes 46 seconds	7
116	Bhagat	47 %	2 minutes 51 seconds	7
117	Bazil	47 %	3 minutes 51 seconds	7
118	utkarsh sharma	47 %	4 minutes 23 seconds	7
119	Assha	47 %	4 minutes 36 seconds	7
120	Anushka	47 %	4 minutes 51 seconds	7
121	aahhhhhhhhhhhhhhhhh	47 %	5 minutes 12 seconds	7
122	pawan	47 %	5 minutes 49 seconds	7
123	Ghr	47 %	6 minutes 7 seconds	7
124	manpreet singh	47 %	6 minutes 55 seconds	7
125	Ashki Kumari	47 %	7 minutes 9 seconds	7
126	jfk	47 %	7 minutes 13 seconds	7
127	Palak gupta	47 %	7 minutes 34 seconds	7
128	Sam	47 %	8 minutes 37 seconds	7
129	sanchit	47 %	12 minutes 23 seconds	7
130	1234	47 %	15 minutes 25 seconds	7
131	Mahmood	47 %	16 minutes 26 seconds	7
132	saini	47 %	16 minutes 54 seconds	7
133	manpreet	40 %	1 minutes 11 seconds	6
134	A	40 %	2 minutes 27 seconds	6
135	kg	40 %	2 minutes 43 seconds	6
136	K	40 %	2 minutes 48 seconds	6
137	Tut	40 %	3 minutes 35 seconds	6
138	sadawfaf	40 %	3 minutes 50 seconds	6
139	Anu	40 %	5 minutes 13 seconds	6
140	kriti	40 %	5 minutes 33 seconds	6
141	A	40 %	6 minutes 3 seconds	6
142	Pranjal	40 %	6 minutes 16 seconds	6
143	jay	40 %	6 minutes 47 seconds	6
144	Riya	40 %	6 minutes 51 seconds	6
145	pawan	40 %	7 minutes 9 seconds	6
146	Ruth	40 %	13 minutes 22 seconds	6
147	Javeed	40 %	16 minutes 36 seconds	6
148	gujjar	33 %	2 minutes 12 seconds	5
149	Woman	33 %	3 minutes 26 seconds	5
150	R sudarshan	33 %	5 minutes 42 seconds	5
151	Nik	33 %	8 minutes 39 seconds	5
152	Minu	33 %	13 minutes 24 seconds	5
153	Biv	27 %	38 seconds	4
154	devansh	27 %	6 minutes	4
155	Bazil	27 %	17 minutes 53 seconds	4
156	inzmam	13 %	1 minutes 8 seconds	2
157	Google maps	13 %	5 minutes 52 seconds	2
158	S	7 %	36 seconds	1
159	Harshit	7 %	2 minutes 50 seconds	1
160	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

More Class 10 Science MCQ Quizzes

Take the quiz now and strengthen your concepts of Our Environment!

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Also See: Determiners Class 10 English Grammar: Notes, Exercises & Free PDF Download

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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