Page 151 - Science Class 07

would carnivores get the flesh of herbivores?
Thus, there is a food chain formed by ea ng

1. Can we survive without the existence of and being eaten. Food chain is important for a
forest? balance in the nature.
2. How do plants maintain balance in the
environment? Primary Secondary
Cosumer Cosumer
3. Why many species of animals have been
Grasshopper
vanished?
Sun Frog
Water
4. Why do we cut the trees?
5. Name any five important products we
obtain from trees. FOOD CHAIN
Producer Grass Snake Ter ary
Cosumer

Fungi
Hawk

According to an interna onal standard a Decomposer Final
country should have at least 33 percent of Cosumer
Food Chain
land under forest cover. But, in our country
it is only about 21%.
v Animals need oxygen for respira on.
During photosynthesis, plants take in CO
2
INTERDEPENDENCE OF PLANTS AND ANIMALS and give out O . In this way, plants maintain
2
What do you eat? Rice, ro , chicken burgers, the amount of oxygen in the nature.
french fries, orange juice and so many other v Plants give shelter to a large number of
things. We all know that, humans are animal species and help in maintaining bio-
dependant on plants and animals for various diversity.
reasons. Plants and animals (humans included)
Dependence of Plants on Animals
are interdependent on each other for many
v Plants need CO for the process of photo-
reasons. In an ecosystem like a forest, the main 2
synthesis. This CO comes from the animals
consequence of this dependence is the food 2
during respira on.
chain.
v Animals like bees, bu erflies, moths, etc.
Let’s see how:
help in pollina on in plants which is
Dependence of Animals on Plants
necessary for the fer lisa on. Some, birds
Animals depend on plants for food. Plants give and bats also help in pollina on.
us foodgrains, fruits, vegetables, spices, tea,
v Dispersal of seeds depend on animals.
coffee, etc. Some animals eat plants called
Birds and other animals are the important
herbivores. Carnivores, though eat the flesh of
agents of seed dispersal. Dispersal of seeds
herbivores that depend on plants for food.
help in plants growth.
Herbivores depend on plants and carnivores
eat flesh, if there is no food for herbivores, how

Science-7 151