i.Globla warming and melting Himalaya –a controversy”
ii Save the tiger.
Home Assignment 1.Making a model to show Rainwater Harvesting.
2.Carry out a survey in your locality where Rainwater is being harvested.
3.Record the mode of transport used by your classmates.
4.Find out the amount of diesel/petrol used by families of your classmates.
5.Checking the PH of water from various sources.
Topic 8 OUR ENVIRONMENT
GIST ECOLOGY – The study of the interaction of living organisms with each other and their surrounding is called ecology.
ENVIRONMENT –Everything that surrounds organisms and influences its life.
Biotic components of environment – The living organisms e.g. Plants and animals.
Abiotic components of environment –the nonliving components like air, light, etc.
ECOSYSTEM – All interacting organism in area =together with the nonliving constituents of environment. ( Functional unit of an environment)
PRODUCERS – They make the energy from sunlight available to the rest of the ecosystem.
CONSUMERS – Animals cannot manufacture their own food. They are called consumers.
BIODEGRABLE – Substances that are broken down by the action of bacteria or saprophytes. e. g. Paper.
NONBIODEGRABLE- Substances that are not broken down by the action of bacteria or saprophytes. e.g. Plastic.
FOOD CHAIN – The process of one organism eating the other.
GRASS GRASSHOPPER FROG SNAKE
FOODWEB --- It is a network of food links between populations in a community.
10% LAW OF ENERGY FLOW – The energy available at any trophic level in a food chain is 10% of the previous one.
BIOLOGICAL MAGNIFICATION – Progressive accumulation of nonbiodegradable waste at various trophic levels of food chain.