Samacheer Kalvi 6th Science Term 3 Solutions Chapter 4 Pdf
Tamilnadu Board Samacheer Kalvi 6th Science Term 3 Solutions Chapter 4: Tamilnadu State Board Solution Class 6 Science Term 3 Chapter 4 – Our Environment.
Samacheer Kalvi 6th Science Term 3 Solutions Chapter 4: Overview
Board |
Samacheer Kalvi |
Class |
6 |
Subject |
Science |
Chapter |
4 |
Chapter Name |
Our Environment |
Samacheer Kalvi 6th Science Term 3 Solutions Chapter 4 Pdf
I.) Choose the correct answer.
1.) Identify the fresh water ecosystem.
a.) Pond
b.) Lake
c.) River
d.) All of them
Answer: All of them
Solution: Pond, lake and river all are sources of fresh water and are fit for human consumption.
2.) Producers are_______________
a.) Animals
b.) Birds
c.) Plants
d.) Snakes
Answer: Plants
Solution: Plants are called producers because they prepare their own food Through the process of photosynthesis. Whereas birds, animals and snakes are called consumers as they depend on producers or other animal for their survival.
3.) It is a biodegradable waste.
a.) Plastic
b.) Coconut Shell
c.) Glass
d.) Aluminium
Answer: Coconut shell
Solution: Coconut shell is a biodegradable waste as it gets decomposed through natural processes. Plastic, glass and aluminium are all non-biodegradable wastes.
4.) It is an undesirable change that occurs In air and water.
a.) Recycling
b.) Reuse
c.) Pollution
d.) Reduce
Answer: Pollution
Solution: Pollution is an undesirable change whereas recycling, reuse and recycle are three R’s use in waste management.
5.) Usage of chemical pesticides and Fertilisers causes ________ pollution.
a.) Air pollution
b.) Water pollution
c.) Noise pollution
d.) None of the above
Answer: Water pollution
Solution: The chemicals used in fertilizers and pesticides are Highly soluble in water. These are leached out through rain in water bodies thereby polluting the water.
II.) Fill in the blanks
1.) Primary consumers that eat plants are Called ___herbivores_______.
2.) Temperature, light and wind are __physical_____ factors.
3.) __Recycling____ is the process of Converting waste materials into new Materials.
4.) Water pollution can spread ___Infectious______ Diseases in man.
5.) The 3R’s are Reduce, __Reuse____ and Recycle.
III.) True or False. If False, give the Correct statement
1.) The Pacific ocean is an example of an Marine ecosystem.
Answer: True
2.) Bacteria and fungi are called Decomposers.
Answer: True
3.) Human and animal wastes are examples Of non-biodegradable waste.
Answer: Human and animal wastes are examples of biodegradable waste.
4.) Excessive use of pesticides leads to air Pollution.
Answer: False. Excessive use of pesticides leads to water pollution.
5.) In schools, waste management rules Say that we should separate waste in Two categories.
Answer: True
- ) Match the following
Answer:
Biotic factors | Animals |
Sewage | Water pollution |
Fertilizers | Land pollution |
Desert | Terrestrial ecosystem |
Smoke | Air Pollution |
V.) Arrange the following in a correct Sequence and form a food chain
1.) Rabbit Carrot Eagle Snake
Answer:Carrot > Rabbit > snake >eagle
2.) Human Insect Algae Fish
Answer: Algae> insect > fish > human
VI.) Give very short answer
1.) Define ecosystem.
Answer:The interrelationships between living organisms in a community or area. It consists of both biotic and abiotic components who depend on one another for survival.
2.) What are the two types of ecosystems?
Answer:The two types of ecosystem are:
- i) Natural ecosystem
- ii) Artificial ecosystem
3.) Write any two things that can be Recycled.
Answer:Paper, plastics, cardboard etc, are the things that can be Recycled.
4.) What are the types of pollution.
Answer:There are 4 types of Pollution
a.) Water pollution
b.) Soil (land) pollution
c.) Noise pollution
d.) Air pollution
5.) Give one example of a food chain in an Aquatic ecosystem?
Answer:
Phytoplankton > zooplankton > small fish >large fish
6.) What are pollutants?
Answer: Substances and harmful chemicals that cause pollution are called pollutants. Examples– Carbon monoxide, nitrogen oxide, pesticides, sulphur oxides etc.
7.) What are the pollutions caused by the Objects given below?
a.) LoudSpeaker
b.) Plastic
Answer: Loud speaker- noise pollution
Plastic- land pollution
VII.) Give short answer
1.) What is biodegradable waste?
Answer: Wastes that gets decomposed through natural processes are called biodegradable wastes. Example – Coconut shell.
2.) How can we reduce water pollution?
Answer: Ways to reduce water pollution are:
- Avoid dumping wastes in open instead use dustbins.
- Release of sewage into water bodies without treatment.
- Minimising the use of pesticides and fertilizers in agriculture.
3.) Write the importance of the food chain.
Answer: In any ecosystem, the feeding relationship and the interaction between Organisms can be best understood by learning about the food chain. In a food chain one Organism depend on another for its survival. If this food chain is imbalanced then Organisms would die. The movement of toxic substances and their impacts can also be learned from the food chain.
VIII.) Answer in detail
1.) Give two examples of how you can Avoid or reduce waste?
Answer: We can avoid or reduce waste by minimising the use of plastic products. Re-use of paper and buying of packaged food should be avoided.
2.) Write a short note on noise pollution.
Answer: Pollution caused due to loud noises or sounds are refer to as noise pollution. Few sources of noise pollution that affects the environment are loud music, fireworks, sounds from vehicles etc. Noise pollution can affect our health leading to high blood pressure and hearing loss. It can also lead to stress. Continuous noise impact our sleep schedule. As a student it is difficult to study when there is a continuous loud sound coming from nearby. Noise pollution can also affect animals and aquatic beings.
IX.) Question based on Higher Order Thinking Skills.
1.) What would happen if an organism is Removed from the food chain?
Answer: The food chain will be disrupted if an organism is Removed from the it. This will cause an imbalance in the ecosystem. As in the food chain , each living being is dependent on another for survival. So if the food chain fall apart then Organisms would die.
2.) Explain the link between waste and Dangerous diseases like dengue and Malaria?
Answer: We all know that mosquito bites are the main cause of dengue and Malaria fever.The habitat for these breeding mosquitoes are open dumps and accumulation of wastes in a place with uncovered containers of stored drinking water.
Therefore, it is important to keep our surroundings clean in order to protect oneself against such diseases.
X.) See the diagram and answer the Following questions.
1.) Explain what is happening in the Picture?
Answer: In this picture, smoke and toxins rising from the burning garbage is causing pollution. The leaching of toxins into the soil and water is leading to soil and water pollution.
2.) What types of pollution are caused by Open dumps?
Answer: The types of Pollution caused by Open dumps are water pollution, soil pollution and air pollution.