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Science Olympiads can benefit students in a variety of ways and have a lot to offer; it has been observed that students are very interested in these tests because they benefit them in a variety of ways. Science Olympiads assist students in better comprehending topics and related concepts. This article includes detailed notes on Science Chapter 8 for Class 4: Our Natural Environment.

All schools are now required to participate in Olympiads. National competitions are introduced to students at an early age. Exams in the Science Olympiad emphasize concept-based learning and logical thinking, and they allow students to compete while also learning more about their own abilities in any subject. 

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Science Chapter 8 For Class 4: Our Environment notes 

We all live in a world full of living things and natural forces. Living things not only exist in their surroundings, but they also interact with them. They both influence and are influenced by their surroundings. Air, water, land, plants, animals, and microorganisms all contribute to the environment in which we live. We rely on our environment to meet our various needs, such as oxygen, food, and shelter. To live a healthy life, we must keep our surroundings neat and clean.

A clean environment is necessary for our health. Two things are required for a healthy lifestyle: sanitation and hygiene. Hygiene refers to the practices we use to stay healthy and clean. Sanitation refers to the actions we take to improve and protect our own health and well-being.

Every home produces waste or garbage. We should not leave waste or garbage lying around. Germs that cause diseases such as cholera, typhoid, and dengue thrive in filthy environments. Mosquitoes breed in contaminated and stagnant water. Malaria is spread by mosquitos.

Waste disposal

To keep our environment clean, proper waste disposal is required. Waste water from our homes should be routed through a proper drainage system and treated before being dumped into bodies of water such as the sea or ocean. In major cities, there are extensive underground pipelines that connect to the main sewage line, which then passes through a treatment plant where wastewater is treated using various methods before being disposed of.

Household solid waste, such as vegetable peels, waste paper, plastic bags, and so on, should be disposed of in covered garbage cans. Throwing these solid wastes outside of houses causes waste piling, which attracts flies and germs and spreads diseases. Open waste dumping can pollute the land, air, and water.

Fruit and vegetable peels, for example, decompose quickly. These are referred to as biodegradable materials. Compost pits can be used to dispose of biodegradable materials. Solid waste stored in pits decomposes into manure that can be used to fertilize crops. Many materials, such as plastic and glass, do not decompose. These are referred to as non-biodegradable materials.

The three R’s – Reduce – Rescue – Recycle

How we manage waste has an impact on the environment, and the environment has an impact on us. Our waste must be carefully managed so that it does not harm the environment or our health. The three R’s will assist us in keeping our surroundings clean and healthy.

Reduce Waste

This means using less. We can save electricity by not using it unnecessarily, and we can save water by closing the water tap when it is not in use.


This entails reusing items.


  • Bring old plastic, cloth, or jute bags to the store to reuse.
  • The plastic or glass container in which we purchase items can be used to store other items at home.
  • Material can be given to people who can use it in its original form. Instead of using disposable cups, bring a washable glass or cup.


Many materials, including paper, glass, aluminum, and plastic, can be recycled to make useful items. Recycling is the process of treating or processing material in such a way that it can be reused.


  • We need fewer trees to make newspapers because we recycle paper. As a result, by cutting fewer trees, we can save our natural environment.
  • We can save energy because factories require energy/power to produce new products.
  • We protect the environment by reducing the amount of waste generated by factories.

About School Connect Online

School Connect Online, as a learning platform, aims to provide students with smart, easy, and simple learning. Competitive exams are frequently difficult. Such exams include a wide range of questions, from large knowledge-based ones to practical ones. It includes both direct objective questions and interpretative problems that students may find difficult to solve. This is why our platform offers free tutorials and sample papers that can be downloaded at any time and from any location. Aside from that, School Connect Online provides some smart techniques and guidelines to help students ace their exams.

School Connect Online offers olympiads such as:

1.National Science Olympiad (NSO)

2. International Mathematics Olympiad (IMO)

3. Coding Olympiad 

4.Artificial Intelligence Olympiad.

Prepare for your Olympiad coaching with the School Connect Olympiad by interacting with one of the greatest educators from IIT, NIT, as well as other institutions!

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