Our Environment

Samacheer Book Back Questions And Answers For Science Standard 6 Term 3 “Our Environment“

I. Choose the correct answer:
1. Identify the freshwater ecosystem.
(a) Pond
(b) Lake
(c) River
(d) All of them

2. Producers are _____.
(a) Animals
(b) Birds
(c) Plants
(d) Snakes

3. It is a biodegradable waste
(a) Plastic
(b) Coconut Shell
(c) Glass
(d) Aluminium

4. It is an undesirable change that occurs in air and water.
(a) Recycling
(b) Reuse
(c) Pollution
(d) Reduce

5. Usage of chemical pesticides and fertilisers causes _____ pollution.
(a) Air pollution
(b) Water pollution
(c) Noise pollution
(d) None of the above

II. Fill in the Blanks:
1. Primary consumers that eat plants are called _____.
2. Temperature, light and wind are _____ factors.
3. _____ is the process of converting waste materials into new materials.
4. Water pollution can spread _____ and chemicals.
5. The 3R’s are Reduce, _____ and Recycle.

Answers:
1. Herbivores
2. Physical
3. Recycle
4. Diseases
5. Reuse

III. True or False. If False, give the correct statement:
1. The Pacific Ocean is an example of an aquatic ecosystem.
2. Bacteria and fungi are called decomposers.
3. Human and animal wastes are examples of non-biodegradable waste.
4. Excessive use of pesticides leads to air pollution.
5. In schools, waste management rules say that we should separate waste in two categories.

Answers:
1. True
2. True
3. False (Human and animal wastes are examples of bio-degradable waste)
4. False (Excessive use of pesticides leads to land pollution)
5. False (In schools, waste management rules say that we should separate waste in three categories)

IV. Match the following:
1. Biotic factor      A. Terrestrial Ecosystem
2. Sewage             B. Land pollution
3. Fertilizers          C. Air pollution
4. Desert               D. Water Pollution
5. Smoke               E. Animals

Answers:
1. E
2. D
3. B
4. A
5. C

V. Arrange the following in a correct sequence and form a food chain:
1. Rabbit → Carrot → Eagle → Snake.
2. Human → Insect → Algae → Fish

Answers:
1. Carrot → rabbit → snake → eagle.
2. Algae → Insect → Fish → Human

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