The document discusses food webs and food chains. It defines them as models that show feeding relationships between organisms in an ecosystem. A food web consists of multiple interconnected food chains, with producers like plants obtaining energy from the sun and consumers obtaining energy by eating other organisms. The document provides examples of herbivores, carnivores, and omnivores, and explains how energy passes from producers to different levels of consumers in a food chain.

1. SCIENCE – FORM TWO FOOD WEBs & FOOD CHAINs Created by: Alison Ong EVALUATION ACTIVITIES VIDEO CONTENTS

2. WHAT IS A FOOD CHAIN ?

4. EXAMPLE OF A FOOD CHAIN

6. What are the differences between food webs and food chains?

7. A food web is actually several food chains joined together.

9. How many food chains can you make from this food web?

13. Three Types of Consumers Omnivores Herbivores Carnivores

23. Medium-sized Omnivores Small Omnivores

26. Let’s Look at a Food Chain

27. A food chain is a simplified way to look at the energy that passes from producers to consumers.

31. 6. The above diagram shows the numbers of organisms in the energy pyramid. At the apex is the A carnivore. B herbivore. C omnivore. D producer. 7. A ________ is a sequence of consumption and represents energy transfer through the environment. A food chain B food web C food pyramid D food organiser 8. The chart in the above figure shows a food chain. What do P, Q and R represent? P Q R A Rabbit Falcon Snake B Rabbit Snake Falcon C Snake Rabbit Falcon D Falcon Snake Rabbit

32. 9. The above diagram shows a food web. If all the snakes die, what happens to the population of the frog? A The population of frogs will increase very fast. B The population of frogs will decrease very fast. C The population of frogs will die, too. D The eagle will die because there is no more food left. 10. In the above food relationship, where the grasshopper eats the green plants and the frog eat the grasshopper.......... A the frog is the prey and the grasshopper is the predator. B the frog is the predator and the grasshopper is the prey. C the frog is the primary consumer. D the grasshopper is the tertiary consumer.

33. GOOD

34. NO

35. http://video.search.yahoo.com/search/video;_ylt=ArqfNUQJzeegttPYVGc.PzGbvZx4?vc=&p=food+webs+and+food+chains&toggle=1&cop=mss&ei=UTF-8&fr=yfp-t-405 Link To Video of Food Webs and Food Chains http://www.google.com.my/#sclient=psy&hl=en&tbm=vid&source=hp&q=food+webs&aq=f&aqi=&aql=&oq=&pbx=1&fp=fecb92ac9f54125e&biw=792&bih=425 http://www.google.com.my/#sclient=psy&hl=en&tbm=vid&source=hp&q=food+webs+and+food+chains&aq=0&aqi=g1&aql=&oq=food+webs+and+&pbx=1&fp=fecb92ac9f54125e&biw=1024&bih=571 http://www.slideshare.net/reaofsun/food-chains-webs-presentation http://www.slideshare.net/sth215/food-chains-and-food-webs-259481

36. Link To Activities In Food Webs and Food Chains www.bogglesworldesl.com http://www.vtaide.com/png/foodchains.htm www. sciencebob.com /questions/q- food _chain_web.php www. woodlands-junior.kent.sch.uk /Homework/fooodchains.htm www. ehow.com /about_6367047_ food -chain- food -web_.html www. tburg.k12.ny.us /mcdonald/foodch1.htm www. dublinschools.net /foodwebschains.aspx www. ecokids.ca /pub/eco_info/topics/frogs/chain_reaction / www. brainpop.com /educators/lp-foodchainsandfoodwebs/ www. lkwdpl.org /schools/elempath/foodchains