Presentation on theme: "Food chain in Sea. hunters otters. Human often make changes in food chains. Then they find that one change causes other changes. That was what happened."— Presentation transcript:
hunters otters. Human often make changes in food chains. Then they find that one change causes other changes. That was what happened when hunters killed nearly all the Pacific sea otters.
1- What is the main idea of this text? 2- How can human make changes in the food chain? 3- Underlined the past tense in this paragraph? wasis happenedhappen killedkill
What is the past tense of “ find” ? found What part of speech “ hunter” is? Hunt ( verb) + er ( suffix) = hunter (noun) What is the meaning of “ hunter”? Someone who hunt animal.
seaweed disappeared The otters lived off the west coast of North America. They lived in beds of giant seaweed, called Kelp. Every year thousands of otters were killed for their fur. By the early 1900s almost none were left. But as the otters disappeared, so did beds of kelp. And so did eagles, harbor seals, and fish. What had happened? The answer lay in the kelp.
Sea urchins are one of the foods otters like best. But when hunter killed the otters, there was no one to eat the urchins. The urchins destroyed the kelp beds.
Once the hunting stopped, the otters made a comeback. They ate sea urchins, and the kelp began to do well. When the kelp did well, the fish came back and so did the eagles, seals and fisherman.
What does the sentence mean? The otters made a come back
3-Making Connections Work With a partner. Complete the chart below.
ln the Ocean.On land 1- Name an animal at the top of the food\d chain 2.Give an example of a plant at the bottom of the food cahin 3. Name an animal that eats only plants. 4. Name an animal that eats other animals. Man Eagle Fox Lion Whale Shark grassGreen plants KelpSea weed Sheep cow Sea urchins fish Snake tiger Seal Big fish
4. Expanding Your Vocabulary food chains in the ocean are hard to study because the plants and animals live underwater. Match the words and phrases with each item in the picture.
1- ………..kelp 2-- ….e…… mackerel 3-- ………….octopus 4- -…………. Killer whale 5- ………..red algae 6- - …………..krill a k c i j
7- …………….squid 8- ……………..tuna 9-…..h ………anchovy 10-……………seal 11- ……g …..sea lion 12-……f …..herring l d b
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