Our Environment

Which practice helps in reducing environmental pollution?

1. Excessive use of plastic
2. Burning waste openly
3. Recycling materials
4. Deforestation

The process of conversion of dead organic matter into simpler substances is called:

1. Photosynthesis
2. Decomposition
3. Respiration
4. Transpiration

What is the main function of decomposers in an ecosystem?

1. Produce food
2. Consume sunlight
3. Recycle nutrients
4. Increase pollution

Which of the following represents the first trophic level in a food chain?

1. Herbivores
2. Carnivores
3. Producers
4. Decomposers

Which of the following is an example of a renewable resource?

1. Coal
2. Petroleum
3. Solar energy
4. Natural gas

The accumulation of harmful chemicals in organisms at higher trophic levels is called:

1. Decomposition
2. Biomagnification
3. Respiration
4. Nitrogen fixation

Which of the following is a non-biodegradable substance?

1. Paper
2. Cotton
3. Plastic
4. Vegetable waste

The ozone layer protects the Earth from:

1. Infrared radiation
2. Ultraviolet radiation
3. Visible light
4. Radio waves

Which gas is mainly responsible for the greenhouse effect?

1. Oxygen
2. Carbon dioxide
3. Nitrogen
4. Hydrogen

According to the 10% law, how much energy is transferred from one trophic level to the next?

1. 1%
2. 5%
3. 10%
4. 50%

The sequence of organisms through which energy passes in an ecosystem is called:

1. Food web
2. Food chain
3. Ecosystem
4. Habitat

Which of the following organisms acts as a decomposer?

1. Lion
2. Grass
3. Bacteria
4. Deer

The organisms that make their own food are called:

1. Consumers
2. Decomposers
3. Producers
4. Parasites

Which of the following is a biotic component of an ecosystem?

1. Sunlight
2. Water
3. Plants
4. Soil

Why are non-biodegradable wastes considered a major environmental problem?

1. They decompose rapidly
2. They improve soil fertility immediately
3. They persist in the environment for long periods and accumulate over time
4. They increase photosynthesis

Why is only a small percentage of energy transferred from one trophic level to the next?

1. Energy is completely stored in organisms
2. Most energy is lost as heat and used in life processes
3. Producers absorb all available energy
4. Consumers do not require energy

What is a food web?

1. A single food chain
2. A network of interconnected food chains
3. A group of producers only
4. A collection of decomposers

Which of the following is a biodegradable substance?

1. Plastic bag
2. Glass bottle
3. Vegetable peels
4. Aluminum can

What is the role of ozone in the atmosphere?

1. Increases global warming directly
2. Absorbs harmful ultraviolet radiation from the Sun
3. Produces oxygen continuously
4. Causes acid rain

Which organisms break down dead plants and animals into simpler substances?

1. Producers
2. Consumers
3. Decomposers
4. Herbivores

What is a food chain?

1. A group of unrelated organisms
2. A sequence showing the transfer of food and energy from one organism to another
3. A type of ecosystem
4. A collection of decomposers

Which organisms obtain food directly from producers?

1. Secondary consumers
2. Tertiary consumers
3. Primary consumers
4. Decomposers

Which of the following is a producer in an ecosystem?

1. Lion
2. Mushroom
3. Green plant
4. Human

What is an ecosystem?

1. A single living organism
2. A community of living organisms interacting with their environment
3. Only plants living together
4. Only non-living components of nature