Class 7 Biology Forests: Our Lifeline Food chain

Food chain

  • A food chain is a series of organisms where all the organisms are dependent on next organism as a source of food.
  • All the components of forests are interrelated to one another.
  • Autotrophs, heterotrophs and saprotrophs in the forest are connected to each other.
  • Autotrophs prepare food by photosynthesis, heterotrophs depend on plants for food and saprophytes feed on heterotrophs and so the process goes on.

For example-  i) Grass àinsects àfrog à snakeà eagle

Grass is eaten by insects and frogs eat the insects which in turn is eaten by the snakes and eagles eat the snakes.

 Class_7_Biology_Forests_OurLifeLine_FoodChain            

Fig. Food chain

  1. ii) sun à plant àdear à lion

Class_7_Biology_Forests_OurLifeLine_FoodChain1

Fig. Food chain 

iii) maizeà locust à lizard à snake

 Class_7_Biology_Forests_OurLifeLine_FoodChain2.jpg

fig. a food chain

  • Many types of food chains can be found in the forest.
  • Food web is a network of food chains where all the chains are naturally interconnected.
  • In a food web nutrients and energy are passed on from one species of living organisms to another.
  • Sun is the ultimate source of energy and energy is absorbed by plants and then transferred through all other organism in a particular area, this transfer of energy is called a food web.
  • If any one component of the forest is removed, it affects all the food chains and ultimately the whole forest.

Share these Notes with your friends  

< Prev Next >

You can check our 5-step learning process


.