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:
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 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.
Giant seaweed ( kelp)
Why are otters killed ? They are killed for their fur. What would happen if all otters were killed?
Can you find a food chain in this paragraph? Kelp Fish Harbor seal Eagle
Make a question The otters lived off the course of North America. Where did the otters live? what is the past of “ Lay”?Laid what is the present of “ left”?Leave
Give a word which means “ very big” Giant What does the word” disappear mean? A- Not seen B- Not found C- Not start
Kelp is a green plant at starts of many food chains. It is eaten by tiny animals that are eaten by bigger animals that are eaten by fish. The fish are food for eagles and seals, as well as people.
Kelp is also eaten by spiny animals called sea urchins. In eating, they may cut off stems at the seafloor. The kelp then floats away.
“Tiny” means? A- very big B- very small
Can you find a food chain
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