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: 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.

2 / 15

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

Decrease in energy at higher trophic levels

Less availability of food

Water

Polluted air

3 / 15

Why do all food chains start with plants?

Because plants are nutritious

Because plants do not require energy

Because plants can produce their own energy

Because plants are easily grown

4 / 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

Eutrophication

Accumulation

5 / 15

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

Reason: The flow of energy is unidirectional.

A is true, but R is false.

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.

6 / 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, 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.

A is false, but R is true.

7 / 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

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

5 kJ

5000 kJ

50 kJ

500 kJ

9 / 15

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

Energy is unidirectional and the matter is repeatedly circulating

Energy is bidirectional and the matter is repeatedly circulating

Energy is repeatedly circulation and the matter is unidirectional

Energy is multidirectional and the matter is bidirectional

10 / 15

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

Producers

Decomposers

Carnivores

Herbivores

11 / 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

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

UV rays; Diatomic oxygen

CFCs; Ozone

Ozone; CFCs

13 / 15

Which of the following features relates to biodegradable substances?

Persist in the environment for long time

May harm the ecosystem

Broken down by biological processes

Remain inert

14 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Decomposer

Secondary consumer

Primary consumer

Producers

15 / 15

The given figure best represents:

food chain in forest, grassland and pond

Food chain in grassland, pond, and forest

Food chain in forest, pond, and grassland

Food chain in forest, grassland, and pond

Food chain in pond, forest, and grassland

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
19	Krisha	87 %	2 minutes 50 seconds	13
20	isu	87 %	4 minutes 50 seconds	13
21	ladleeeeeeeeeeeee	87 %	5 minutes	13
22	Amit	87 %	5 minutes 15 seconds	13
23	rose	87 %	6 minutes 1 seconds	13
24	MSA	87 %	8 minutes 21 seconds	13
25	ff	87 %	9 minutes 32 seconds	13
26	Kevin	87 %	13 minutes 12 seconds	13
27	S	87 %	26 minutes 51 seconds	13
28	xxx	80 %	1 minutes 32 seconds	12
29	isu	80 %	2 minutes 58 seconds	12
30	r	80 %	3 minutes 39 seconds	12
31	Yash Kushwaha	80 %	4 minutes 37 seconds	12
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35	k	80 %	5 minutes 36 seconds	12
36	nehmad and gulu	80 %	7 minutes 17 seconds	12
37	A	73 %	1 minutes 13 seconds	11
38	ffff	73 %	2 minutes 54 seconds	11
39	Karthick	73 %	3 minutes 13 seconds	11
40	Abhinav. C	73 %	4 minutes 3 seconds	11
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42	Tanishka	73 %	4 minutes 32 seconds	11
43	Rijjakjot	73 %	6 minutes 21 seconds	11
44	Pooja	73 %	9 minutes 15 seconds	11
45	S	73 %	2 hours 56 minutes 44 seconds	11
46	Djfu	67 %	1 minutes 53 seconds	10
47	Name	67 %	3 minutes 7 seconds	10
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54	aaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh	67 %	8 minutes 22 seconds	10
55	Siddhi Panchal	67 %	9 minutes 12 seconds	10
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58	k	67 %	11 minutes 19 seconds	10
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60	Anurag	67 %	15 minutes 12 seconds	10
61	kushal	60 %	2 minutes 31 seconds	9
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63	m	60 %	2 minutes 49 seconds	9
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65	ghfgh	60 %	4 minutes 20 seconds	9
66	Jh	60 %	4 minutes 29 seconds	9
67	Amritha	60 %	5 minutes 40 seconds	9
68	naimish	60 %	7 minutes 3 seconds	9
69	adarsh	60 %	12 minutes 23 seconds	9
70	indu	60 %	16 minutes	9
71	GIIS	60 %	58 minutes 11 seconds	9
72	ghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiihhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhl	53 %	1 minutes 45 seconds	8
73	Sukriti	53 %	3 minutes 5 seconds	8
74	E	53 %	3 minutes 7 seconds	8
75	arag	53 %	3 minutes 21 seconds	8
76	sddddddddd	53 %	3 minutes 34 seconds	8
77	T	53 %	3 minutes 41 seconds	8
78	66	53 %	4 minutes 38 seconds	8
79	..	53 %	4 minutes 50 seconds	8
80	Mk	53 %	5 minutes 57 seconds	8
81	Big	53 %	7 minutes 21 seconds	8
82	udit kumar	53 %	7 minutes 50 seconds	8
83	Suhani	53 %	8 minutes 33 seconds	8
84	Santosh	53 %	20 minutes 47 seconds	8
85	Hani	47 %	2 minutes 9 seconds	7
86	AKSHARAA.S	47 %	2 minutes 46 seconds	7
87	Bhagat	47 %	2 minutes 51 seconds	7
88	Bazil	47 %	3 minutes 51 seconds	7
89	utkarsh sharma	47 %	4 minutes 23 seconds	7
90	Assha	47 %	4 minutes 36 seconds	7
91	Anushka	47 %	4 minutes 51 seconds	7
92	aahhhhhhhhhhhhhhhhh	47 %	5 minutes 12 seconds	7
93	pawan	47 %	5 minutes 49 seconds	7
94	Ghr	47 %	6 minutes 7 seconds	7
95	manpreet singh	47 %	6 minutes 55 seconds	7
96	Ashki Kumari	47 %	7 minutes 9 seconds	7
97	jfk	47 %	7 minutes 13 seconds	7
98	Palak gupta	47 %	7 minutes 34 seconds	7
99	sanchit	47 %	12 minutes 23 seconds	7
100	1234	47 %	15 minutes 25 seconds	7
101	Mahmood	47 %	16 minutes 26 seconds	7
102	saini	47 %	16 minutes 54 seconds	7
103	manpreet	40 %	1 minutes 11 seconds	6
104	A	40 %	2 minutes 27 seconds	6
105	Tut	40 %	3 minutes 35 seconds	6
106	sadawfaf	40 %	3 minutes 50 seconds	6
107	Anu	40 %	5 minutes 13 seconds	6
108	kriti	40 %	5 minutes 33 seconds	6
109	A	40 %	6 minutes 3 seconds	6
110	Pranjal	40 %	6 minutes 16 seconds	6
111	jay	40 %	6 minutes 47 seconds	6
112	Riya	40 %	6 minutes 51 seconds	6
113	pawan	40 %	7 minutes 9 seconds	6
114	Ruth	40 %	13 minutes 22 seconds	6
115	Javeed	40 %	16 minutes 36 seconds	6
116	gujjar	33 %	2 minutes 12 seconds	5
117	R sudarshan	33 %	5 minutes 42 seconds	5
118	Nik	33 %	8 minutes 39 seconds	5
119	Minu	33 %	13 minutes 24 seconds	5
120	Biv	27 %	38 seconds	4
121	devansh	27 %	6 minutes	4
122	Bazil	27 %	17 minutes 53 seconds	4
123	inzmam	13 %	1 minutes 8 seconds	2
124	Google maps	13 %	5 minutes 52 seconds	2
125	S	7 %	36 seconds	1
126	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: The Making of a Global World: A+ Class 10 Notes

About the Quiz

Why Take This Quiz?

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Key Topics Covered in the Quiz

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