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

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

A and C

A and B

B and D

D and F

2 / 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 false but R is true.

A is true but R is false.

3 / 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 repeatedly circulation and the matter is unidirectional

Energy is unidirectional and the matter is repeatedly circulating

4 / 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

500 kJ

50 kJ

5 / 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.

6 / 15

Which trophic level is incorrectly defined?

Decomposers – microbial heterotrophs

Herbivores – primary consumers

Carnivores – Secondary or tertiary consumers

Omnivores – molds, yeast, and mushrooms

7 / 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?

1000 J

It will depend on the type of the terrestrial plant

10,000 J

100 J

8 / 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

Tiger will start eating grass

The population of tigers increases

9 / 15

Why do all food chains start with plants?

Because plants are easily grown

Because plants are nutritious

Because plants can produce their own energy

Because plants do not require energy

10 / 15

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

Carnivores

Decomposers

Herbivores

Producers

11 / 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

12 / 15

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

Producer to primary consumer

Secondary consumer to environment

Primary consumer to secondary consumer

Producer to decomposer

13 / 15

The given figure best represents:

Food chain in grassland, pond, and forest

Food chain in forest, grassland, and pond

Food chain in forest, pond, and grassland

Food chain in pond, forest, and grassland

14 / 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 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.

A is false, but R is true.

15 / 15

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

Water

Less availability of food

Decrease in energy at higher trophic levels

Polluted air

Your score is

The average score is 62%

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

Why Take This Quiz?

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Key Topics Covered in the Quiz

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