Our Environment Class 10 Science MCQ Quiz – Test Your Knowledge

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
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Chapter 13 - Our Environment

1 / 15

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

Decomposers

Producers

Carnivores

Herbivores

2 / 15

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

Grass → Deer → Tiger

The population of tigers increases

The population of tigers decreases and the population of grass increases

The population of grass decreases

Tiger will start eating grass

3 / 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 false, but R is true.

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

A is true, but R is false.

4 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Primary consumer

Producers

Secondary consumer

Decomposer

5 / 15

Why do all food chains start with plants?

Because plants do not require energy

Because plants are nutritious

Because plants can produce their own energy

Because plants are easily grown

6 / 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

7 / 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

50 kJ

500 kJ

5000 kJ

5 kJ

8 / 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

Food chain in forest, grassland, and pond

9 / 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

Act at every trophic level of the food chain

Do not break down organic compounds

10 / 15

Which of the following features relates to biodegradable substances?

Broken down by biological processes

May harm the ecosystem

Persist in the environment for long time

Remain inert

11 / 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

12 / 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

100 J

10,000 J

1000 J

13 / 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; rays UV

CFCs; Ozone

14 / 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

Biomagnification

Eutrophication

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, and R is the correct explanation of the assertion.

A is true, but R is false.

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

Your score is

The average score is 60%

Leaderboard – Top Scorers

Check out the highest scorers below!

Pos.	Name	Score	Duration	Points
1	Priya	100 %	1 minutes 10 seconds	15
2	Abhinav	100 %	1 minutes 23 seconds	15
3	Sa	100 %	1 minutes 26 seconds	15
4	Varun	100 %	1 minutes 37 seconds	15
5	Priya Singh	100 %	1 minutes 42 seconds	15
6	Priya Singh	100 %	1 minutes 47 seconds	15
7	varun	100 %	1 minutes 47 seconds	15
8	Nirun	100 %	1 minutes 51 seconds	15
9	Anmol	100 %	2 minutes 2 seconds	15
10	Manu Manvith	100 %	2 minutes 5 seconds	15
11	Veer	100 %	2 minutes 9 seconds	15
12	,,,,	100 %	2 minutes 10 seconds	15
13	Manvith	100 %	3 minutes 1 seconds	15
14	Shree	100 %	3 minutes 23 seconds	15
15	Pritha	100 %	3 minutes 33 seconds	15
16	varun	100 %	5 minutes 38 seconds	15
17	Priya Singh	100 %	8 minutes 17 seconds	15
18	Akarsh	93 %	1 minutes 30 seconds	14
19	Vivian	93 %	1 minutes 35 seconds	14
20	Priya	93 %	2 minutes 8 seconds	14
21	Varun	93 %	2 minutes 8 seconds	14
22	Priya Singh	93 %	2 minutes 12 seconds	14
23	Priya Singh	93 %	2 minutes 25 seconds	14
24	Ashish	93 %	2 minutes 34 seconds	14
25	/	93 %	2 minutes 37 seconds	14
26	Judith	93 %	2 minutes 46 seconds	14
27	Nirun	93 %	2 minutes 46 seconds	14
28	Mahi	93 %	2 minutes 52 seconds	14
29	Harshita	93 %	3 minutes 11 seconds	14
30	.	93 %	3 minutes 22 seconds	14
31	Gaurav	93 %	5 minutes 19 seconds	14
32	Priya Singh	93 %	7 minutes 1 seconds	14
33	Sivangi	93 %	10 minutes 51 seconds	14
34	Iqra Nafees	93 %	12 minutes 20 seconds	14
35	varun	93 %	31 minutes 21 seconds	14
36	Hi	87 %	1 minutes 57 seconds	13
37	Shabby	87 %	2 minutes 8 seconds	13
38	Amal Roshna	87 %	2 minutes 9 seconds	13
39	Soumya	87 %	2 minutes 15 seconds	13
40	Anaya	87 %	2 minutes 45 seconds	13
41	Varun	87 %	3 minutes	13
42	.	87 %	3 minutes 11 seconds	13
43	Kajal	87 %	3 minutes 16 seconds	13
44	Cc	87 %	3 minutes 18 seconds	13
45	Anushka	87 %	3 minutes 19 seconds	13
46	Anmol	87 %	3 minutes 22 seconds	13
47	golu chaudhry	87 %	3 minutes 24 seconds	13
48	A	87 %	3 minutes 56 seconds	13
49	Anu	87 %	3 minutes 58 seconds	13
50	Praveen	87 %	4 minutes 11 seconds	13
51	Abhishek Kumar	87 %	4 minutes 15 seconds	13
52	Judith	87 %	4 minutes 46 seconds	13
53	Shalu	87 %	4 minutes 52 seconds	13
54	M	87 %	5 minutes 36 seconds	13
55	Shraddha	87 %	5 minutes 36 seconds	13
56	gfyfyt	87 %	5 minutes 57 seconds	13
57	Harahul	87 %	6 minutes 26 seconds	13
58	H	87 %	8 minutes 11 seconds	13
59	akki	87 %	17 minutes 41 seconds	13
60	Akarsh	80 %	1 minutes 23 seconds	12
61	Shreyansh Singh	80 %	1 minutes 32 seconds	12
62	Akarsh	80 %	1 minutes 40 seconds	12
63	Shreyansh Singh	80 %	2 minutes 17 seconds	12
64	Pritha	80 %	2 minutes 41 seconds	12
65	Shreya R Gowda	80 %	3 minutes 14 seconds	12
66	Aakriti	80 %	3 minutes 15 seconds	12
67	pakhee	80 %	3 minutes 18 seconds	12
68	Siva	80 %	3 minutes 31 seconds	12
69	Vinayak	80 %	3 minutes 49 seconds	12
70	ARR	80 %	3 minutes 58 seconds	12
71	Dj	80 %	4 minutes 2 seconds	12
72	Trinay	80 %	4 minutes 2 seconds	12
73	Hariharan	80 %	4 minutes 30 seconds	12
74	Veronica	80 %	4 minutes 31 seconds	12
75	Anishpanday	80 %	5 minutes 5 seconds	12
76	Maliha	80 %	5 minutes 49 seconds	12
77	Ari	80 %	7 minutes 23 seconds	12
78	Raj	80 %	7 minutes 27 seconds	12
79	Ssdddf	80 %	8 minutes 34 seconds	12
80	Rishith	80 %	9 minutes 4 seconds	12
81	Abhinav Singh	80 %	9 minutes 17 seconds	12
82	Sonam	80 %	16 minutes 39 seconds	12
83	De	80 %	1 hours 49 minutes 4 seconds	12
84	Manvi	73 %	1 minutes 26 seconds	11
85	Sri	73 %	1 minutes 44 seconds	11
86	Namrta	73 %	1 minutes 52 seconds	11
87	Rv	73 %	1 minutes 52 seconds	11
88	Ashish	73 %	2 minutes 1 seconds	11
89	Vighneshwari	73 %	2 minutes 10 seconds	11
90	Vcvj	73 %	3 minutes 7 seconds	11
91	u	73 %	3 minutes 7 seconds	11
92	Ishu	73 %	3 minutes 10 seconds	11
93	Shree	73 %	3 minutes 13 seconds	11
94	fire	73 %	3 minutes 17 seconds	11
95	Harsha	73 %	3 minutes 22 seconds	11
96	Vir	73 %	3 minutes 41 seconds	11
97	Dhhritii	73 %	3 minutes 53 seconds	11
98	Akhil yadav	73 %	4 minutes 5 seconds	11
99	Vivek Kumar	73 %	4 minutes 10 seconds	11
100	Vivaan	73 %	4 minutes 32 seconds	11
101	Kj	73 %	4 minutes 43 seconds	11
102	Ravi	73 %	5 minutes 3 seconds	11
103	Priyanshi Yadav	73 %	5 minutes 20 seconds	11
104	Rahi	73 %	5 minutes 20 seconds	11
105	Vaibhav Goel	73 %	5 minutes 34 seconds	11
106	Trinay	73 %	5 minutes 38 seconds	11
107	Shree	73 %	5 minutes 39 seconds	11
108	goluswamy	73 %	5 minutes 45 seconds	11
109	Sahasra Pagidimarri	73 %	5 minutes 45 seconds	11
110	Ghdx	73 %	5 minutes 50 seconds	11
111	jeyvanth	73 %	5 minutes 55 seconds	11
112	Harsha	73 %	5 minutes 58 seconds	11
113	Diksha	73 %	6 minutes	11
114	Ari	73 %	6 minutes 2 seconds	11
115	Aakriti	73 %	6 minutes 4 seconds	11
116	Deepika	73 %	6 minutes 35 seconds	11
117	I	73 %	6 minutes 39 seconds	11
118	GURNOOR	73 %	6 minutes 39 seconds	11
119	golu chaudhry	73 %	6 minutes 51 seconds	11
120	Gaurav Dubey	73 %	7 minutes 34 seconds	11
121	DIYA DIJESH	73 %	7 minutes 49 seconds	11
122	Himanshu	73 %	8 minutes 11 seconds	11
123	F	73 %	8 minutes 13 seconds	11
124	akash	73 %	8 minutes 16 seconds	11
125	Lana	73 %	8 minutes 19 seconds	11
126	Himanshu	73 %	8 minutes 38 seconds	11
127	Preeti	73 %	8 minutes 59 seconds	11
128	jai	73 %	9 minutes 5 seconds	11
129	Pritha	73 %	9 minutes 42 seconds	11
130	Vighneshwari	67 %	1 minutes 50 seconds	10
131	yo	67 %	1 minutes 59 seconds	10
132	Sahil	67 %	2 minutes 41 seconds	10
133	Shreyansh Singh	67 %	3 minutes 5 seconds	10
134	Nikhil	67 %	3 minutes 6 seconds	10
135	M,ydhz	67 %	3 minutes 32 seconds	10
136	Oufwqeufb	67 %	3 minutes 37 seconds	10
137	Arushi	67 %	3 minutes 42 seconds	10
138	Rukhsar	67 %	4 minutes 9 seconds	10
139	Vivek Kumar	67 %	4 minutes 15 seconds	10
140	Dilasa	67 %	4 minutes 25 seconds	10
141	Kritika	67 %	5 minutes 5 seconds	10
142	Nirun	67 %	5 minutes 19 seconds	10
143	Amal Roshna	67 %	5 minutes 20 seconds	10
144	Shabby	67 %	5 minutes 33 seconds	10
145	Sahil	67 %	5 minutes 33 seconds	10
146	Mahi sharma	67 %	5 minutes 41 seconds	10
147	Maya	67 %	6 minutes 12 seconds	10
148	kk	67 %	6 minutes 18 seconds	10
149	A	67 %	6 minutes 39 seconds	10
150	Mamta	67 %	6 minutes 48 seconds	10
151	garima	67 %	6 minutes 57 seconds	10
152	Manvith	67 %	6 minutes 57 seconds	10
153	Anupriya patel	67 %	7 minutes 5 seconds	10
154	Shravya	67 %	7 minutes 29 seconds	10
155	Adarsh	67 %	8 minutes 20 seconds	10
156	Pritam Ghosh	67 %	9 minutes 32 seconds	10
157	mmm	67 %	13 minutes 16 seconds	10
158	Sneha	67 %	33 minutes 15 seconds	10
159	Samarth	60 %	1 minutes 58 seconds	9
160	Manisha	60 %	2 minutes	9
161	Kashish	60 %	2 minutes 7 seconds	9
162	Aditya dubey	60 %	3 minutes 9 seconds	9
163	Rock it 🤛🏻	60 %	3 minutes 26 seconds	9
164	Saanvi	60 %	3 minutes 29 seconds	9
165	Sahaf ahmad	60 %	3 minutes 33 seconds	9
166	Anne	60 %	3 minutes 34 seconds	9
167	..	60 %	3 minutes 46 seconds	9
168	R	60 %	3 minutes 47 seconds	9
169	Pravin	60 %	4 minutes	9
170	Umar	60 %	4 minutes 4 seconds	9
171	yo	60 %	4 minutes 7 seconds	9
172	Prachi	60 %	4 minutes 12 seconds	9
173	Hsvf	60 %	4 minutes 27 seconds	9
174	YUVRAJ JOGSAN	60 %	4 minutes 27 seconds	9
175	Yashika	60 %	4 minutes 40 seconds	9
176	Komal	60 %	4 minutes 56 seconds	9
177	Sri	60 %	5 minutes 7 seconds	9
178	Shatakshi	60 %	5 minutes 19 seconds	9
179	Avantika	60 %	5 minutes 45 seconds	9
180	Nikhil	60 %	5 minutes 51 seconds	9
181	Gf	60 %	5 minutes 58 seconds	9
182	Aditya yadav	60 %	6 minutes 33 seconds	9
183	Anurag soni	60 %	7 minutes 3 seconds	9
184	Bably kimari	60 %	7 minutes 23 seconds	9
185	Bhoomika	60 %	7 minutes 55 seconds	9
186	Kamini	60 %	7 minutes 58 seconds	9
187	Vaibhav Goel	60 %	8 minutes 6 seconds	9
188	Abhishek	60 %	8 minutes 14 seconds	9
189	Deepesh	60 %	8 minutes 58 seconds	9
190	Prachi verma	60 %	9 minutes 57 seconds	9
191	Shivendra Singh Sengar	60 %	10 minutes 4 seconds	9
192	Anushka	60 %	11 minutes 41 seconds	9
193	Priyanshu	60 %	11 minutes 53 seconds	9
194	Beauty Singh	60 %	14 minutes 45 seconds	9
195	Khushi	60 %	23 minutes 55 seconds	9
196	A	60 %	1 hours 7 minutes 7 seconds	9
197	garima	60 %	6 hours 36 minutes 27 seconds	9
198	Abhinav Singh	53 %	1 minutes 42 seconds	8
199	Mm	53 %	1 minutes 49 seconds	8
200	Urmila	53 %	2 minutes 7 seconds	8

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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