Class 10 Chapter 15 – Our Environment
- Substances that are broken down by biological processes are said to be biodegradable
- Non-biodegradable substances may be inert and simply persist in the environment for a long time or may harm the various members of the eco-system.
ECO-SYSTEM and ITS COMPONENTS
- An ecosystem consists of biotic components comprising living organisms and abiotic components comprising.
- All green plants and certain blue green algae which can produce food by photosynthesis are called the producers.
- The organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are the consumers.
- Consumers can be classed variously as herbivores, carnivores, omnivores and parasites.
- Decomposers break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants.
- Series of organisms feeding on one another or organisms taking part at various biotic levels form a food chain.
- Each step or level of the food chain forms a trophic level.
- The autotrophs or the producers are at the first trophic level.
- Autotrophs fix up the solar energy and make it available for heterotrophs or the consumers.
- The herbivores or the primary consumers come at the second trophic level.
- Small carnivores or the secondary consumers are at the third trophic level.
- Larger carnivores or the tertiary consumers form the fourth trophic level.
- The food we eat acts as a fuel to provide us energy to do work.
- The interactions among various components of the environment, involves flow of energy from one component of the system to another.
- The autotrophs capture the energy present in sunlight and convert it into chemical energy. This energy supports all the activities of the living world.
- From autotrophs, the energy goes to the heterotrophs and decomposers.
- The green plants in a terrestrial ecosystem capture about 1% of the energy of sunlight that falls
- On their leaves and convert it into food energy.
- Since so little energy is available for the next level of consumers, food chains generally consist of only three or four steps.
- The loss of energy at each step is so great that very little usable energy remains after four trophic levels.
- There are generally a greater number of individuals at the lower trophic levels of an ecosystem, the greatest number is of the producers.
- So instead of a straight line food chain, the relationship can be shown as a series of branching lines called a food web.
- The flow of energy is
- As it moves progressively through the various trophic levels it is no longer available to the previous level.
Ozone Layer and How it is Getting Depleted
- Class 10 Chapter 1 – Chemical Reactions and Equations
- Class 10 chapter 2 – Acids, Bases and Salts
- Class 10 Chapter 3 – Metals and Non Metals
- Class 10 Chapter 4 – Carbon and its Compounds
- Class 10 Chapter 5 – Periodic Classification of Elements
- Class 10 Chapter 6 – Life Processes
- class 10 chapter 7 – Control and Coordination
- Class 10 Chapter 8 – How do Organisms Reproduce?
- Class 10 Chapter 9 – Heredity and Evolution
- Class 10 Chapter 10 – Light – Reflection and Refraction
- Class 10 Chapter 11 – The Human Eye and the Colourful World
- Class 10 Chapter 12 – Electricity
- Class 10 Chapter 13 – Magnetic Effects of Electric Current
- Class 10 Chapter 14 – Sources of Energy
- Class 10 Chapter 15 – Our Environment
- Class 10 Chapter 16 – Management of Natural Resources
- Class 10 Question Bank Chapter 1 – Chemicals Reactions and Equations
- Class 10 Question Bank Chapter 2 – Acids, Bases and Salts
- Class 10 Question Bank Chapter 3 – Metals and non metals
- Class 10 Question Bank Chapter 4 – Carbon and its Compounds
- Class 10 Question Bank Chapter 5 – Periodic Classification of Elements
- Class 10 Question Bank Chapter 6 – Life processes
- Class 10 Question Bank Chapter 7 – Control and Coordination
- Class 10 Question Bank Chapter 8 – How do Organisms Reproduce?
- Class 10 Question Bank Chapter 9 – Heredity and Evolution
- Class 10 Question Bank Chapter 10 – Light – Reflection and Refraction
- Class 10 Question Bank Chapter 11 – The Human Eye and the Colourful World
- Class 10 Question Bank Chapter 12 – Electricity
- Class 10 Question Bank Chapter 13 – Magnetic effects of electric current
- Class 10 Question Bank Chapter 14 – Sources of Energy
- Class 10 Question Bank Chapter 15 – Our environment
- Class 10 Question Bank Chapter 16 – Management of Natural Resources