NCERT  ·  Science  ·  Class X  ·  Ch.13

Our Environment
MCQ Series

Ecosystem · Food Chains · Ozone Layer · Waste Management · Biodegradability — 50 expert questions crafted for CBSE Boards and JEE preparation.

⚡ Start Quiz 📊 Analytics
50
Questions
22 min
Suggested Time
5
Topics Covered
30
CBSE Board
Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Board
30
State Board
13
Olympiad Level
7

🗂 Topic Coverage

Ecosystem & Components
24%
Food Chains & Webs
20%
Energy Flow & Pyramids
18%
Ozone Layer
16%
Waste Management
22%
30
CBSE Board
13
State Board
7
Olympiad Level
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

🌍
Ecosystem
All living organisms (biotic) + non-living components (abiotic) in an area interacting as a system. Producers, consumers (herbivores, carnivores, omnivores), decomposers.
🍃
Food Chain & Web
Food chain: linear energy transfer (grass → grasshopper → frog → snake → eagle). Food web: network of interconnected food chains. More complex = more stable.
⚡
Energy Flow
10% law (Lindemann): only 10% of energy is transferred to the next trophic level. Hence short food chains are more energy-efficient.
📊
Ecological Pyramids
Pyramid of number, biomass, and energy. Pyramid of energy is always upright. Pyramid of biomass can be inverted (ocean: zooplankton > phytoplankton in biomass at a given time).
🌤️
Ozone Layer
Ozone (O₃) in stratosphere absorbs harmful UV radiation. CFCs (chlorofluorocarbons) from refrigerants/aerosols catalytically destroy ozone molecules → ozone hole.
♻️
Waste Management
Biodegradable waste (paper, food, natural fibres) can be decomposed. Non-biodegradable (plastics, metals, pesticides) persist and bioaccumulate up food chains.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

~6%

of CBSE Science — definition and diagram MCQs, all NCERT-direct

Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 Define and give examples of biotic and abiotic components of an ecosystem
02 Construct a food chain of at least 4 trophic levels from a given set of organisms
03 Apply the 10% energy law to calculate available energy at each trophic level
04 Explain the three types of ecological pyramids and identify which can be inverted
05 Explain how CFCs cause depletion of the ozone layer with the chemical mechanism
06 Distinguish biodegradable from non-biodegradable waste and describe their management
Exam Preparation

Strategy & Preparation Tips

4 evidence-based strategies to maximise your score in CBSE Boards and JEE.

01
Step 01
10% Law Calculations
CBSE gives: "If producers have 10,000 J, how much reaches the tertiary consumer?" Answer: 10,000 → 1,000 → 100 → 10 J. Simple chain of divisions.
02
Step 02
Pyramid Diagrams
Draw all 3 pyramid types for a grassland ecosystem. Know which ones can be inverted and why. The inverted biomass pyramid for oceans is the most tested fact.
03
Step 03
Ozone Chemistry (Simplified)
CFC → releases Cl. Cl + O₃ → ClO + O₂. ClO + O → Cl + O₂. Net: one Cl destroys many O₃ molecules. This catalytic cycle is a 2-mark explanation.
04
Step 04
Biodegradable vs Non-Bio Examples
Keep 5 examples of each. Non-biodegradable ones in food chains cause biomagnification (DDT in fish → humans). This distinction is worth 3 MCQs per paper.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Our Environment Quiz
🎯 Knowledge Check

Biology — Our Environment

50 Questions Class 10 MCQs
1
Which of the following is a biodegradable waste?
2
Which of the following is an abiotic component of an ecosystem?
3
The three R’s (Reduce, Reuse, Recycle) are used to:
4
The energy flow in a food chain is always:
5
Which organism is always at the first trophic level?
6
Ozone protects us from:
7
The main reason for ozone depletion is:
8
In a food chain, the transfer of energy is governed by:
9
Which of the following is a non-biodegradable waste?
10
The biological process that maintains balance in nature is:
11
Which one is a natural ecosystem?
12
The topmost trophic level in a food chain is occupied by:
13
The decomposers in an ecosystem include:
14
Which gas is responsible for global warming?
15
The term "biomagnification" refers to:
16
Which of the following is an example of a food chain?
17
Which of the following wastes is best disposed of by composting?
18
The ozone layer is located in the:
19
Consumers that feed only on plants are called:
20
Which one is a man-made ecosystem?
21
Which process converts biodegradable waste into manure?
22
Food webs are formed by:
23
The main aim of waste management is to:
24
Which of the following is an apex predator?
25
Excessive use of fertilizers leads to:
26
Which component is not a part of an ecosystem?
27
Global warming results mainly from:
28
The major cause of soil pollution is:
29
The ultimate source of energy for all living organisms is:
30
The primary consumers in a grassland ecosystem are:
31
A carnivore that eats only primary consumers is called:
32
A pond ecosystem includes:
33
DDT is an example of:
34
The practice that reduces waste at the source is:
35
Which gas is released during decomposition?
36
Which is the best method to manage plastic waste?
37
A lion obtains energy by feeding on deer. Here lion is a:
38
The ozone hole is mainly observed over:
39
Which human activity increases pollution the most?
40
The most important group responsible for nutrient recycling is:
41
A food chain must start with:
42
The greenhouse effect refers to:
43
Which waste material causes biomagnification?
44
Ecosystem balance can be disturbed by:
45
Which of the following forms the largest part of a food web?
46
Which of the following is NOT a greenhouse gas?
47
Excessive algal bloom in water bodies is caused by:
48
Which step helps in reducing plastic pollution?
49
A plant-eating animal is called:
50
Which of the following activities is environment-friendly?
📚
ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
Sharing this chapter
Challenge Yourself: 50 Our Environment MCQs Class 10
Challenge Yourself: 50 Our Environment MCQs Class 10 — Complete Notes & Solutions · academia-aeternum.com
Understanding how different components of our environment interact is essential for developing scientific awareness and responsible citizenship. These MCQs on NCERT Class 10 Science Chapter 13 – Our Environment are designed to strengthen conceptual clarity about ecosystems, food chains, trophic levels, waste management, ozone depletion, and environmental conservation. Each question encourages learners to think critically about real-life environmental issues while preparing effectively for…
🎓 Class 10 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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    Our Environment — Learning Resources

    📄 Detailed Notes
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    Our Environment-Exercise
    📚
    ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
    Sharing this chapter
    Challenge Yourself: 50 Our Environment MCQs Class 10
    Challenge Yourself: 50 Our Environment MCQs Class 10 — Complete Notes & Solutions · academia-aeternum.com
    Understanding how different components of our environment interact is essential for developing scientific awareness and responsible citizenship. These MCQs on NCERT Class 10 Science Chapter 13 – Our Environment are designed to strengthen conceptual clarity about ecosystems, food chains, trophic levels, waste management, ozone depletion, and environmental conservation. Each question encourages learners to think critically about real-life environmental issues while preparing effectively for…
    🎓 Class 10 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
    Share on
    WhatsApp
    Telegram
    X / Twitter
    Facebook
    Instagram
    Threads
    Pinterest
    LinkedIn
    Quora
    Discord
    Reddit
    Email
    academia-aeternum.com/class-10/science/our-environment/mcqs/ Copy link
    💡
    Exam tip: Sharing chapter notes with your study group creates a reinforcement loop. Teaching a concept is the fastest path to mastering it.

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