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Class VI S T3 Our Environment Textbook Solutions
Unit 4
Our Environment
Evaluation
I. Choose the appropriate answer
1. Identify the fresh water ecosystem.
a. Pond
b. Lake
c. River
d. All of them
Ans: d. All of them
2. Producers are_______________
a. Animals
b. Birds
c. Plants
d. Snakes
Ans: c. Plants
3. It is a biodegradable waste.
a. Plastic
b. Coconut Shell
c. Glass
d. Aluminium
Ans: b. Coconut Shell
4. It is an undesirable change that occurs in air and water.
a. Recycling
b. Reuse
c. Pollution
d. Reduce
Ans: c. Pollution
5. Usage of chemical pesticides and fertilisers causes ________ pollution.
a. Air pollution
b. Water pollution
c. Noise pollution
d. None of the above
Ans: b. Water pollution
II. Fill in the blanks
1. Primary consumers that eat plants are called __________.
Ans: herbivores.
2. Temperature, light and wind are________ factors.
Ans: physical
3. __________ is the process of converting waste materials into new
Materials.
Ans: Recycling
4. Water pollution can spread __________ diseases in man.
Ans:
5. The 3R’s are Reduce, __________ and Recycle.
Ans: Reuse
III. True or False. If False, give the correct statement
1. The Pacific ocean is an example of a marine ecosystem.
Ans: True
2. Bacteria and fungi are called decomposers.
Ans: True
3. Human and animal wastes are examples of non-biodegradable waste.
Ans: False. Human and animal wastes are examples of biodegradable waste.
4. Excessive use of pesticides leads to air pollution.
Ans: False. Excessive use of pesticides leads to water pollution.
5. In schools, waste management rules say that we should separate waste in two categories.
Ans: True
IV. Match the following
1. Biotic factor - Animals
2. Sewage - Water Pollution
3. Fertilizers - Land pollution
4. Desert - Terrestrial Ecosystem
5. Smoke - Air pollution
V. Arrange the following in a correct sequence and form a food chain
1. Rabbit Carrot Eagle Snake
Carrot → Rabbit → Snake → Eagle
2. Human Insect Algae Fish
Algae → Insect → Fish → Human
VI. Give very short answer
1. Define ecosystem.
Ecosystem is a community of living and non-living things that work together.
2. What are the two types of ecosystems?
There are two types of ecosystems :
Natural ecosystem
Artificial ecosystem
3. Write any two things that can be recycled.
Plastics
Iron
4. What are the types of pollution?
There are four major kinds of pollution:
1. Air pollution
2. Water pollution
3. Land (soil) pollution
4. Noise pollution
5. Give one example of a food chain in an aquatic ecosystem?
Food chain in aquatic ecosystem
Aquatic plant →Aquatic insect → Larvae → Fish
6. What are pollutants?
Any substance that causes pollution is known as a pollutant.
Industrial effluents,fertilizers,pesticides,plastics and electronic wastes are few examples for pollutants.
7. What are the pollutions caused by the objects given below?
a. Loud Speaker- Noise pollution
b. Plastic - Land pollution
VII. Give short answer
1. What is biodegradable waste?
The waste that can be easily degraded by other living organisms is biodegradable waste.
2. How can we reduce water pollution?
Do not pour leftover oil, old medicines or waste down the drain or into the toilet.
Reduce the use of chemical pesticides and fertilizers to grow crops.
Use wastewater for gardening at home.
Do not litter or dump waste – always use a waste bin
3. Write the importance of the food chain.
Food chains are important because they show the intricate relationships in ecosystems.
They reveal how each organism depends on other organisms for survival.
Food chains also show how entire communities collapse when a producer or consumer is lost.
VIII. Answer in detail
1. Give two examples of how you can avoid or reduce waste?
We use reusable bags for shopping grocery, clothes, books, household goods, etc.
I always carry and use reusable water bottles at all times.
I use an ink pen instead of a ballpoint pen.
2. Write a short note on noise pollution.
Noise pollution affects the environment. Loud music, the sounds of motor vehicles, fireworks and machines cause noise pollution. Continuous noise disturbs our sleep and does not allow us to study. Noise pollution has been directly linked to stress and health impacts such as high blood pressure and hearing loss. Loud noise or even loud music can damage our ears. Noise pollution also disturbs animals. Birds have to communicate louder so that they can hear each other in noisy areas. Even underwater noise pollution from ships, can make whales lose their way as they use sounds to navigate
IX. Question based on Higher Order Thinking Skills
1. What would happen if an organism is removed from the food chain?
When an organism is removed from the food chain, it spoils the flow of energy in the ecosystem. As a result, the other organism which depends on the removed organism will also die due to starvation.
2. Explain the link between waste and dangerous diseases like dengue and malaria?
The common link for these two different diseases is their relationship with water.
Malaria is caused by a parasite, and a virus causes Dengue Fever.
Malaria and Dengue fever, both are carried by mosquitoes, which lay their larvae in still water.
In order to control these infectious diseases, it is imperative to provide clean, safe drinking water and improved sanitation to the public.
X. See the diagram and answer the following questions
1. Explain what is happening in the picture?
Burning and leaching of garbage is shown in the picture, which leads to air, land and water pollution.
2. What types of pollution are caused by open dumps?
Air pollution
Water pollution
Land pollution.
