FOOD CHAIN & FOOD WEB

FOOD CHAIN & FOOD WEB

1. FOOD CHAIN & FOOD WEB Presented By : Drashti Patel M.Sc Sem - I Environmental Science

2. Outline Introduction to food chain Types of food chain Tropic levels in food chain Introduction to food webs Ecological pyramids Types of pyramids

3. Introduction to food chain FOOD CHAIN A food chain is the path by which energy in the form of food, passes from one living thing to another within the ecosystem

4. Types of food chain Mainly two types of food chain A] Grazing food chain B] Detritus food chain [A] Grazing food chain grass→rabbit→fox→lion [B] Detritus food chain soil→earth warm→rat→snake→eagle

5. Tropic levels in the food chain Mainly three tropic levels in food chain Producers Consumers Decomposers

6. Producers Producers make their own food. Green plants use energy from the sun to prepare food. Producers are on the bottom of the food chain.

7. Consumers Organisms that do not make their own food. Another term for heterotroph is consumer because they consume other organisms in order to live.

8. Mainly three types of consumers Herbivores Carnivores Omnivores

9. Herbivores

10. Carnivores

11. Omnivores

12. Decomposers Microorganisms that are able to break down large molecules into smaller parts. Decomposers return the nutrients that are in a living thing to the soil. ex. Bacteria Fungi

13. Introduction to food webs A number of food chains form a interlinking pattern forming a web like arrangement known as food web.

14. Ecological pyramids The pyramidal representation of tropic levels different organisms based on their ecological position [producer to final consumer] is called as an ecological pyramids.

15. Types of pyramids Mainly three types of pyramids Pyramid of number Pyramid of biomass Pyramid of energy

16. Pyramid of number

17. 2) Pyramid of biomass

18. 3) Pyramid of energy

19. References : Odum , EP and Barrete , GW (Year?). Fundamentals of ecology. Publisher? Pp? Guided By : Dr. Nishith Dharaiya

20. Any Question…???

21. THANK YOU !!! 