The entire chapter deals with our surrounding and environment. Science chapter 15, our environment deals with the place where living and non-living things are dependent on each other. Organisms with the ability to grow, reproduce, absorb and use energy, excrete waste, react to their surroundings, and have a well-organized structure. There are three types of living beings: Herbivores, Carnivores, Omnivores
Science chapter 15 our environment teaches us about Producers that create their own food like plants, Consumers that depend upon others for food such as humans and animals and Decomposers which feed on dead plants and animals such as bacterial, fungi and worms. A food chain is an ascending chain of species in which each one is reliant on the one before it. Many food chains can exist in our climate, all of which are interconnected at different levels. As a result, many food chains form a network known as the food web.
Science chapter 15, our environment teaches us about trophic levels, biological magnification and ecosystem.
Trophic levels refer to the various levels of the food chain. Biological magnification is the accumulation of toxic substances like mercury, DDT, and pesticides as we go up the trophic ladder. This is a system of interdependencies between different living and non-living organisms in a specific ecosystem. There are two types of components in an ecosystem, which are biotic and non-biotic factors or biotic and non-biotic living beings.
The chapter also covers waste, types of waste and ozone depletion. The world is contaminated as a result of our pollution. It is of two types:
1- Biodegradable: can be decomposed by living organisms such as decomposers.
2- Non-Biodegradable: cannot be decomposed by living organisms.
The ozone layer is located at a high altitude in the atmosphere. You will also study the causes of ozone layer depletion. As ultraviolet radiation strikes oxygen, it is converted to ozone. Chlorofluorocarbons are the molecules that are used in refrigeration and air conditioning that affects and depletes the ozone layer.
|Chapter 1 Chemical Reactions and Equations||Chapter 2 Acids, Bases and Salts||Chapter 3 Metals and Non-Metals|
|Chapter 4 Carbon and its Compounds||Chapter 5 Periodic Classification of Elements||Chapter 6 Life Processes|
|Chapter 7 Control and Coordination||Chapter 8 How do Organisms Reproduce||Chapter 9 Heredity and Evolution|
|Chapter 10 Light Reflection and Refraction||Chapter 11 The Human Eye and Colorful World||Chapter 12 Electricity|
|Chapter 13 Magnetic Effects of Electric Current||Chapter 14 Sources of Energy||Chapter 15 Our Environment|
|Chapter 16 Sustainable Management of Natural Resources|
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