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

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

Biomagnification

Accumulation

Eutrophication

2 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Producers

Primary consumer

Secondary consumer

Decomposer

3 / 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.

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.

4 / 15

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

Energy is bidirectional and the matter is repeatedly circulating

Energy is multidirectional and the matter is bidirectional

Energy is unidirectional and the matter is repeatedly circulating

Energy is repeatedly circulation and the matter is unidirectional

5 / 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, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

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

6 / 15

Which trophic level is incorrectly defined?

Decomposers – microbial heterotrophs

Omnivores – molds, yeast, and mushrooms

Herbivores – primary consumers

Carnivores – Secondary or tertiary consumers

7 / 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

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

Do not break down organic compounds

Act at every trophic level of the food chain

8 / 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

Fourth trophic level

Third trophic level

First trophic level

9 / 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:

Ozone; CFCs

UV rays; Diatomic oxygen

CFCs; Ozone

CFCs; rays UV

10 / 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?

100 J

It will depend on the type of the terrestrial plant

1000 J

10,000 J

11 / 15

The given figure best represents:

Food chain in pond, forest, and grassland

Food chain in forest, grassland, and pond

Food chain in forest, pond, and grassland

Food chain in grassland, pond, and forest

12 / 15

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

D and F

A and C

B and D

A and B

13 / 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

500 kJ

5 kJ

50 kJ

5000 kJ

14 / 15

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

Primary consumer to secondary consumer

Producer to primary consumer

Secondary consumer to environment

Producer to decomposer

15 / 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, 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 true, but R is false.

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

More Class 10 Science MCQ Quizzes

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Also See: Master Carbon & Its Compounds Class 10 Notes That Actually Work!

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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