Our Environment Book Back Questions & Answers
Unit 4 > Science > Class 6 > Samacheer Kalvi - English Medium
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1. Identify the fresh water ecosystem.
a. Pond
b. Lake
c. River
d. All of them
Correct answer: d. All of them
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2. Producers are_______________
a. Animals
b. Birds
c. Plants
d. Snakes
Correct answer: c. Plants
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3. It is a biodegradable waste.
a. Plastic
b. Coconut Shell
c. Glass
d. Aluminium
Correct answer: b. Coconut Shell
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4. It is an undesirable change that occurs in air and water.
a. Recycling
b. Reuse
c. Pollution
d. Reduce
Correct answer: c. Pollution
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5. Usage of chemical pesticides and fertilisers causes ________ pollution.
a. Air pollution
b. Water pollution
c. Noise pollution
d. None of the above
Correct answer: b. Water pollution
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1. Primary consumers that eat plants are called __________.
Correct answer: Herbivores
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2. Temperature, light and wind are ________ factors.
Correct answer: Physical
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3. __________ is the process of converting waste materials into new materials.
Correct answer: Recycling
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4. Water pollution can spread __________ and chemicals.
Correct answer: Diseases
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5. The 3Rs are Reduce, __________ and Recycle.
Correct answer: Reuse
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1. Biotic factor
Correct answer: Animals
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2. Sewage
Correct answer: Water Pollution
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3. Fertilizers
Correct answer: Land pollution
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4. Desert
Correct answer: Terrestrial Ecosystem
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5. Smoke
Correct answer: Air pollution
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1. Rabbit-- Carrot-- Eagle-- Snake
Correct answer: Carrot - Rabbit - Snake - Eagle
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2. Human-- Insect-- Algae-- Fish
Correct answer: Algae - Insect - Fish - Human
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1. The Pacific ocean is an example of an aquatic ecosystem.
Correct answer: True
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2. Bacteria and fungi are called decomposers.
Correct answer: True
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3. Human and animal wastes are examples of non-biodegradable waste.
Correct answer: False
Correct Statement: Human and animal wastes are examples of biodegradable waste
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4. Excessive use of pesticides leads to air pollution.
Correct answer: False
Correct Statement: Excessive use of pesticides leads to water pollution.
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5. In schools, waste management rules say that we should separate waste in two categories.
Correct answer: True