1️⃣ Which of the following is a non-biodegradable waste? 🗑️
- A. Vegetable peels
- B. Paper
- C. Plastic
- D. Cotton cloth
Show Answer 🔽
✅ C. Plastic
2️⃣ The ozone layer is important because it: ☁️
- A. Protects from UV radiation
- B. Absorbs carbon dioxide
- C. Produces oxygen
- D. Traps greenhouse gases
Show Answer 🔽
✅ A. Protects from UV radiation
3️⃣ Which gas is responsible for ozone layer depletion? 🧪
- A. Carbon dioxide
- B. Methane
- C. Chlorofluorocarbons (CFCs)
- D. Oxygen
Show Answer 🔽
✅ C. Chlorofluorocarbons (CFCs)
4️⃣ Which of the following organisms is always at the first trophic level? 🌿
- A. Carnivores
- B. Herbivores
- C. Omnivores
- D. Producers
Show Answer 🔽
✅ D. Producers
5️⃣ The decomposers in an ecosystem include: 🍄
- A. Plants
- B. Bacteria and fungi
- C. Herbivores
- D. Carnivores
Show Answer 🔽
✅ B. Bacteria and fungi
6️⃣ Energy flow in an ecosystem is: 🔁
- A. Cyclic
- B. Random
- C. Unidirectional
- D. Irregular
Show Answer 🔽
✅ C. Unidirectional
7️⃣ Which is the correct sequence in a food chain? 🍽️
- A. Carnivores → Herbivores → Producers
- B. Producers → Herbivores → Carnivores
- C. Herbivores → Producers → Carnivores
- D. Decomposers → Carnivores → Producers
Show Answer 🔽
✅ B. Producers → Herbivores → Carnivores
8️⃣ Which of these is a biodegradable material? ♻️
- A. Glass
- B. Plastic bag
- C. Aluminum foil
- D. Cotton
Show Answer 🔽
✅ D. Cotton
9️⃣ Greenhouse effect is caused by: 🌡️
- A. Oxygen
- B. Nitrogen
- C. Greenhouse gases
- D. Hydrogen
Show Answer 🔽
✅ C. Greenhouse gases
🔟 Food web is: 🕸️
- A. Linear chain of food
- B. Interconnected food chains
- C. Only herbivores and carnivores
- D. Only producers and consumers
Show Answer 🔽
✅ B. Interconnected food chains
1️⃣1️⃣ Which of the following is a greenhouse gas? 🌫️ (PYQ)
- A. Nitrogen
- B. Oxygen
- C. Carbon dioxide
- D. Hydrogen
Show Answer 🔽
✅ C. Carbon dioxide
1️⃣2️⃣ What will happen if all decomposers are eliminated from the Earth? 🌍 (PYQ)
- A. Herbivore population increases
- B. Dead matter accumulates
- C. More oxygen is produced
- D. Carnivores vanish
Show Answer 🔽
✅ B. Dead matter accumulates
1️⃣3️⃣ Which of the following is the best method to dispose of kitchen waste? 🍽️
- A. Incineration
- B. Composting
- C. Landfilling
- D. Dumping in water bodies
Show Answer 🔽
✅ B. Composting
1️⃣4️⃣ Which of these is not part of a food chain? ❌
- A. Producer
- B. Herbivore
- C. Decomposer
- D. Fossil fuel
Show Answer 🔽
✅ D. Fossil fuel
1️⃣5️⃣ Trophic levels represent: 📊
- A. Steps in food chain
- B. Types of plants
- C. Number of species
- D. Biodegradable waste
Show Answer 🔽
✅ A. Steps in food chain
1️⃣6️⃣ Which of the following is not biodegradable? 🚫
- A. Animal bones
- B. Wool
- C. Polythene
- D. Tea leaves
Show Answer 🔽
✅ C. Polythene
1️⃣7️⃣ How much energy is transferred from one trophic level to the next? 🔄 (PYQ)
- A. 100%
- B. 50%
- C. 10%
- D. 1%
Show Answer 🔽
✅ C. 10%
1️⃣8️⃣ The most harmful effect of CFCs is: 🧪
- A. Global warming
- B. Water pollution
- C. Ozone depletion
- D. Acid rain
Show Answer 🔽
✅ C. Ozone depletion
1️⃣9️⃣ Which of the following is a correct food chain? 🔗
- A. Plants → Deer → Lion
- B. Lion → Plants → Deer
- C. Deer → Lion → Plants
- D. Lion → Deer → Plants
Show Answer 🔽
✅ A. Plants → Deer → Lion
2️⃣0️⃣ Which organism feeds on both plants and animals? 🍔
- A. Herbivore
- B. Carnivore
- C. Omnivore
- D. Decomposer
Show Answer 🔽
✅ C. Omnivore
2️⃣1️⃣ Which of the following contributes to acid rain? 🌧️
- A. Ozone
- B. Sulphur dioxide
- C. Nitrogen gas
- D. Hydrogen
Show Answer 🔽
✅ B. Sulphur dioxide
2️⃣2️⃣ Which human activity is responsible for ozone layer depletion? 🧼 (PYQ)
- A. Use of pesticides
- B. Use of CFC-based coolants
- C. Industrial noise
- D. Mining
Show Answer 🔽
✅ B. Use of CFC-based coolants
2️⃣3️⃣ In a food chain, energy is lost as: 🔥
- A. Heat
- B. Sound
- C. Movement
- D. Light
Show Answer 🔽
✅ A. Heat
2️⃣4️⃣ The term “biomagnification” refers to: 📈
- A. Accumulation of food
- B. Accumulation of toxic chemicals
- C. Growth of population
- D. Increase in biodiversity
Show Answer 🔽
✅ B. Accumulation of toxic chemicals
2️⃣5️⃣ The primary source of energy in an ecosystem is: ☀️ (PYQ)
- A. Plants
- B. Water
- C. Sun
- D. Soil
Show Answer 🔽
✅ C. Sun
2️⃣6️⃣ What is the role of decomposers? 🔄
- A. Eat producers
- B. Eat herbivores
- C. Convert organic waste to simpler substances
- D. Make food
Show Answer 🔽
✅ C. Convert organic waste to simpler substances
2️⃣7️⃣ Which one is a non-renewable resource? ⛽
- A. Water
- B. Wind
- C. Sunlight
- D. Petroleum
Show Answer 🔽
✅ D. Petroleum
2️⃣8️⃣ Which of the following would increase the size of the ozone hole? 🧊
- A. Increase in oxygen
- B. Increased use of plastics
- C. Increased use of CFCs
- D. Decrease in nitrogen
Show Answer 🔽
✅ C. Increased use of CFCs
2️⃣9️⃣ The final trophic level in a food chain is generally occupied by: 🦁
- A. Herbivores
- B. Decomposers
- C. Producers
- D. Top carnivores
Show Answer 🔽
✅ D. Top carnivores
3️⃣0️⃣ Ozone is a molecule made of: ⚗️
- A. One oxygen atom
- B. Two oxygen atoms
- C. Three oxygen atoms
- D. Four oxygen atoms
Show Answer 🔽
✅ C. Three oxygen atoms
3️⃣1️⃣ Which organism can be at both second and third trophic levels? 🐒
- A. Lion
- B. Cow
- C. Human
- D. Snake
Show Answer 🔽
✅ C. Human
3️⃣2️⃣ The major cause of the greenhouse effect is: 🌍
- A. High oxygen levels
- B. Increase in UV rays
- C. Emission of CO₂ and methane
- D. Acid rain
Show Answer 🔽
✅ C. Emission of CO₂ and methane
3️⃣3️⃣ Ozone layer is present in: ☁️
- A. Troposphere
- B. Mesosphere
- C. Stratosphere
- D. Exosphere
Show Answer 🔽
✅ C. Stratosphere
3️⃣4️⃣ Which group contains only biodegradable items? ♻️ (PYQ)
- A. Plastic, paper, fruit peels
- B. Cotton, wool, leather
- C. Paper, plastic, wood
- D. Polythene, bones, wool
Show Answer 🔽
✅ B. Cotton, wool, leather
3️⃣5️⃣ Which of the following is most harmful for the environment? ❌
- A. Paper bags
- B. Jute bags
- C. Cloth bags
- D. Plastic bags
Show Answer 🔽
✅ D. Plastic bags
3️⃣6️⃣ If all herbivores are removed from the ecosystem, it will affect: 🌱🐄
- A. Only carnivores
- B. Only decomposers
- C. Producers and carnivores
- D. None
Show Answer 🔽
✅ C. Producers and carnivores
3️⃣7️⃣ Energy flow in a food chain is governed by: 💡 (PYQ)
- A. 20% Law
- B. 90% Law
- C. 10% Law
- D. Law of inertia
Show Answer 🔽
✅ C. 10% Law
3️⃣8️⃣ Biodegradable waste can be broken down by: 🔬
- A. Physical processes
- B. Sunlight
- C. Microorganisms
- D. Machines
Show Answer 🔽
✅ C. Microorganisms
3️⃣9️⃣ Which of the following is a secondary consumer? 🐍
- A. Grass
- B. Cow
- C. Snake
- D. Frog
Show Answer 🔽
✅ C. Snake
4️⃣0️⃣ Which of these human activities has caused maximum damage to the environment? 🏭
- A. Using CNG
- B. Using LED bulbs
- C. Burning fossil fuels
- D. Installing solar panels
Show Answer 🔽
✅ C. Burning fossil fuels
4️⃣1️⃣ Which statement is true about food chains? 🔗
- A. They are always straight
- B. They always start with consumers
- C. They start with producers and flow toward top consumers
- D. Decomposers are always in the middle
Show Answer 🔽
✅ C. They start with producers and flow toward top consumers
4️⃣2️⃣ Which of the following will not reduce waste production? 🚯
- A. Recycling
- B. Composting
- C. Reusing
- D. Dumping in rivers
Show Answer 🔽
✅ D. Dumping in rivers
4️⃣3️⃣ The maximum energy is available at which trophic level? 🔋
- A. Producer
- B. Herbivore
- C. Carnivore
- D. Decomposer
Show Answer 🔽
✅ A. Producer
4️⃣4️⃣ What causes biological magnification in a food chain? 🧬 (PYQ)
- A. Oxygen
- B. CO₂
- C. Harmful chemicals
- D. Nitrogen
Show Answer 🔽
✅ C. Harmful chemicals
4️⃣5️⃣ An eco-friendly activity among the following is: 🌿
- A. Using plastic straws
- B. Burning leaves
- C. Using paper bags
- D. Throwing garbage in open
Show Answer 🔽
✅ C. Using paper bags
4️⃣6️⃣ What is the role of sunlight in an ecosystem? ☀️
- A. Maintains temperature
- B. Powers decomposers
- C. Initiates photosynthesis
- D. Causes pollution
Show Answer 🔽
✅ C. Initiates photosynthesis
4️⃣7️⃣ Which among these is a non-greenhouse gas? ❄️
- A. Carbon dioxide
- B. Methane
- C. Nitrous oxide
- D. Oxygen
Show Answer 🔽
✅ D. Oxygen
4️⃣8️⃣ What is the main component of biogas? 🔥
- A. Methane
- B. Carbon monoxide
- C. Oxygen
- D. Hydrogen
Show Answer 🔽
✅ A. Methane
4️⃣9️⃣ The amount of energy transferred from one level to next is only: ⚡
- A. 100%
- B. 10%
- C. 50%
- D. 25%
Show Answer 🔽
✅ B. 10%
5️⃣0️⃣ Which component is not part of a natural ecosystem? 🌲
- A. Air
- B. Water
- C. Buildings
- D. Plants
Show Answer 🔽
✅ C. Buildings
5️⃣1️⃣ Which of the following organisms help in cleaning the environment? 🧹
- A. Lions
- B. Cows
- C. Decomposers
- D. Elephants
Show Answer 🔽
✅ C. Decomposers
5️⃣2️⃣ Which of the following pollutants is mainly responsible for ozone depletion? ☠️
- A. CO₂
- B. SO₂
- C. CFCs
- D. NO₂
Show Answer 🔽
✅ C. CFCs
5️⃣3️⃣ What is the main function of producers in an ecosystem? 🌱
- A. Decompose waste
- B. Eat other animals
- C. Make food using sunlight
- D. Absorb CO₂
Show Answer 🔽
✅ C. Make food using sunlight
5️⃣4️⃣ Which of these is NOT a greenhouse gas? 💨
- A. Methane
- B. Carbon dioxide
- C. Oxygen
- D. Nitrous oxide
Show Answer 🔽
✅ C. Oxygen
5️⃣5️⃣ A food chain always begins with: 🌞 (PYQ)
- A. Herbivores
- B. Decomposers
- C. Carnivores
- D. Producers
Show Answer 🔽
✅ D. Producers
5️⃣6️⃣ What will happen if we remove decomposers from the environment? 🧫
- A. More biodiversity
- B. No photosynthesis
- C. Waste will pile up
- D. More food chains form
Show Answer 🔽
✅ C. Waste will pile up
5️⃣7️⃣ An example of a primary consumer is: 🐄
- A. Lion
- B. Goat
- C. Eagle
- D. Snake
Show Answer 🔽
✅ B. Goat
5️⃣8️⃣ Which of the following shows correct energy flow in a food chain? 🔁
- A. Carnivores → Herbivores → Producers
- B. Producers → Herbivores → Carnivores
- C. Herbivores → Producers → Carnivores
- D. Decomposers → Herbivores → Producers
Show Answer 🔽
✅ B. Producers → Herbivores → Carnivores
5️⃣9️⃣ Which level of consumers directly depends on producers for food? 🌿
- A. Secondary consumers
- B. Primary consumers
- C. Tertiary consumers
- D. Apex consumers
Show Answer 🔽
✅ B. Primary consumers
6️⃣0️⃣ The ozone layer protects us from: ☀️ (PYQ)
- A. Gamma rays
- B. X-rays
- C. Infrared rays
- D. Ultraviolet rays
Show Answer 🔽
✅ D. Ultraviolet rays
6️⃣1️⃣ The main source of CFCs is: ❄️
- A. Cooking gas
- B. Air conditioners and refrigerators
- C. Fertilizers
- D. Plastic bottles
Show Answer 🔽
✅ B. Air conditioners and refrigerators
6️⃣2️⃣ What is meant by a food web? 🕸️
- A. Only linear food chains
- B. All consumers feeding on the same plant
- C. Interconnected food chains
- D. Carnivores eating herbivores only
Show Answer 🔽
✅ C. Interconnected food chains
6️⃣3️⃣ Which of these is the cleanest source of energy? 💡
- A. Petroleum
- B. Coal
- C. Wind
- D. Diesel
Show Answer 🔽
✅ C. Wind
6️⃣4️⃣ Which part of the food chain gets the least energy? 📉
- A. Producers
- B. Primary consumers
- C. Secondary consumers
- D. Tertiary consumers
Show Answer 🔽
✅ D. Tertiary consumers
6️⃣5️⃣ Which type of waste takes the longest time to decompose? 🕒
- A. Food scraps
- B. Paper
- C. Cotton
- D. Plastic
Show Answer 🔽
✅ D. Plastic
6️⃣6️⃣ Which of these is the last link in a food chain? 🔗
- A. Producer
- B. Consumer
- C. Decomposer
- D. Omnivore
Show Answer 🔽
✅ C. Decomposer
6️⃣7️⃣ In biological magnification, harmful chemicals:
- A. Decrease at each level
- B. Get diluted
- C. Accumulate more at higher levels
- D. Stay the same
Show Answer 🔽
✅ C. Accumulate more at higher levels
6️⃣8️⃣ Which is the most eco-friendly practice? ♻️
- A. Burning plastic
- B. Using one-time disposables
- C. Carrying cloth bags
- D. Using fossil fuels
Show Answer 🔽
✅ C. Carrying cloth bags
6️⃣9️⃣ Which activity will reduce the size of your carbon footprint? 👣
- A. Using diesel cars
- B. Cycling to school
- C. Using plastic bags
- D. Eating packaged food
Show Answer 🔽
✅ B. Cycling to school
7️⃣0️⃣ What type of resource is sunlight? ☀️
- A. Renewable
- B. Non-renewable
- C. Artificial
- D. Exhaustible
Show Answer 🔽
✅ A. Renewable
7️⃣1️⃣ Which human activity contributes the most to global warming? 🌡️
- A. Planting trees
- B. Using solar energy
- C. Burning fossil fuels
- D. Using windmills
Show Answer 🔽
✅ C. Burning fossil fuels
7️⃣2️⃣ What is the correct sequence of energy flow in an ecosystem? 🔁
- A. Sun → Carnivore → Herbivore → Producer
- B. Sun → Producer → Herbivore → Carnivore
- C. Producer → Sun → Herbivore → Carnivore
- D. Carnivore → Producer → Sun → Herbivore
Show Answer 🔽
✅ B. Sun → Producer → Herbivore → Carnivore
7️⃣3️⃣ Which of the following is a renewable resource? ♻️
- A. Petroleum
- B. Natural gas
- C. Wind
- D. Coal
Show Answer 🔽
✅ C. Wind
7️⃣4️⃣ Which of the following is a threat to biodiversity? 🐘
- A. Wildlife conservation
- B. Reforestation
- C. Habitat destruction
- D. Ecotourism
Show Answer 🔽
✅ C. Habitat destruction
7️⃣5️⃣ Which process is responsible for the conversion of dead organisms to nutrients? 🌿
- A. Respiration
- B. Photosynthesis
- C. Decomposition
- D. Fermentation
Show Answer 🔽
✅ C. Decomposition
7️⃣6️⃣ Why is energy flow in an ecosystem unidirectional? ➡️
- A. Because energy is recycled
- B. Due to sunlight loss
- C. Energy is lost as heat at each level
- D. Trophic levels are circular
Show Answer 🔽
✅ C. Energy is lost as heat at each level
7️⃣7️⃣ The term ‘biodegradable’ refers to substances that: 🧪
- A. Cannot be broken down
- B. Are toxic to animals
- C. Can be broken down by microorganisms
- D. Are not part of ecosystem
Show Answer 🔽
✅ C. Can be broken down by microorganisms
7️⃣8️⃣ Which of the following is an abiotic component of an ecosystem? ⛰️
- A. Bacteria
- B. Plants
- C. Animals
- D. Temperature
Show Answer 🔽
✅ D. Temperature
7️⃣9️⃣ Which of the following contributes to water pollution? 🚱
- A. Reuse of grey water
- B. Industrial waste discharge
- C. Rain harvesting
- D. Wastewater treatment
Show Answer 🔽
✅ B. Industrial waste discharge
8️⃣0️⃣ The largest amount of energy in a food pyramid is available at: 🔺 (PYQ)
- A. Top carnivore level
- B. Herbivore level
- C. Producer level
- D. Omnivore level
Show Answer 🔽
✅ C. Producer level
8️⃣1️⃣ Which human action does NOT harm the environment? ✅
- A. Deforestation
- B. Reforestation
- C. Industrial waste dumping
- D. Fossil fuel burning
Show Answer 🔽
✅ B. Reforestation
8️⃣2️⃣ Which of the following breaks down waste in composting? 🍃
- A. Light
- B. Oxygen only
- C. Bacteria and fungi
- D. Earthworms only
Show Answer 🔽
✅ C. Bacteria and fungi
8️⃣3️⃣ Which of these is NOT a consequence of global warming? 🌎
- A. Melting glaciers
- B. Rising sea levels
- C. Increase in rainfall
- D. Decreased atmospheric CO₂
Show Answer 🔽
✅ D. Decreased atmospheric CO₂
8️⃣4️⃣ The gas primarily responsible for acid rain is: 🌧️
- A. Oxygen
- B. Sulphur dioxide
- C. Methane
- D. Ozone
Show Answer 🔽
✅ B. Sulphur dioxide
8️⃣5️⃣ Biodegradable waste includes: 🍎
- A. Plastic bottles
- B. Glass jars
- C. Vegetable peels
- D. Aluminium foil
Show Answer 🔽
✅ C. Vegetable peels
8️⃣6️⃣ An increase in which gas causes the greenhouse effect? 🌫️
- A. Nitrogen
- B. Oxygen
- C. Carbon dioxide
- D. Hydrogen
Show Answer 🔽
✅ C. Carbon dioxide
8️⃣7️⃣ Which is NOT a biodegradable item? ❌
- A. Banana peel
- B. Old newspaper
- C. Polythene bag
- D. Eggshell
Show Answer 🔽
✅ C. Polythene bag
8️⃣8️⃣ The best way to manage organic kitchen waste is: 🥦
- A. Burning
- B. Composting
- C. Landfilling
- D. Dumping in rivers
Show Answer 🔽
✅ B. Composting
8️⃣9️⃣ Which of the following practices helps conserve the environment? 🌿
- A. Overuse of pesticides
- B. Throwing plastic in open
- C. Rainwater harvesting
- D. Cutting down trees
Show Answer 🔽
✅ C. Rainwater harvesting
9️⃣0️⃣ A stable ecosystem is one where: ⚖️
- A. Energy is reused
- B. There is only one food chain
- C. Species interact and maintain balance
- D. No decomposers are present
Show Answer 🔽
✅ C. Species interact and maintain balance
9️⃣1️⃣ Which of the following helps reduce soil pollution? 🌱
- A. Using chemical fertilizers
- B. Burning plastic
- C. Practicing organic farming
- D. Dumping e-waste
Show Answer 🔽
✅ C. Practicing organic farming
9️⃣2️⃣ The correct order of food chain is: 📊
- A. Herbivore → Producer → Carnivore
- B. Producer → Carnivore → Herbivore
- C. Producer → Herbivore → Carnivore
- D. Carnivore → Herbivore → Producer
Show Answer 🔽
✅ C. Producer → Herbivore → Carnivore
9️⃣3️⃣ What is one main cause of water pollution? 💧
- A. Composting
- B. Industrial discharge
- C. Solar energy
- D. Reforestation
Show Answer 🔽
✅ B. Industrial discharge
9️⃣4️⃣ The largest food chain contributor is: 🌾
- A. Animals
- B. Humans
- C. Plants
- D. Fungi
Show Answer 🔽
✅ C. Plants
9️⃣5️⃣ What is the effect of biomagnification on top consumers? 🐆
- A. They get stronger
- B. No effect
- C. Accumulate maximum toxins
- D. Die due to starvation
Show Answer 🔽
✅ C. Accumulate maximum toxins
9️⃣6️⃣ Why is plastic harmful to the environment? ♨️
- A. It evaporates easily
- B. It is 100% biodegradable
- C. It stays in the environment for years
- D. It increases oxygen content
Show Answer 🔽
✅ C. It stays in the environment for years
9️⃣7️⃣ Which of the following helps control global warming? 🌍
- A. Using more plastic
- B. Afforestation
- C. Burning coal
- D. Using diesel cars
Show Answer 🔽
✅ B. Afforestation
9️⃣8️⃣ What type of ecosystem is a pond? 🐟
- A. Natural
- B. Artificial
- C. Terrestrial
- D. Desert
Show Answer 🔽
✅ A. Natural
9️⃣9️⃣ What is the main cause of ozone hole formation? 🕳️
- A. Burning wood
- B. UV rays
- C. Chlorofluorocarbons
- D. CO₂ emissions
Show Answer 🔽
✅ C. Chlorofluorocarbons
1️⃣0️⃣0️⃣ Which of the following is a major non-biodegradable pollutant? 🛍️
- A. Fruit peel
- B. Paper
- C. Cotton
- D. Plastic
Show Answer 🔽
✅ D. Plastic