Name: hood Aatef

Class:11-A-1

What is the lesson about?

Humans 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 .

How can human make changes in the food chain?

What do you think that may happen if the wren disappeared from the

food chain? .

What is the main idea?

What is the past tense of “ find? ”

Found

Underline the past tense

What part of speech “ hunter” is ?

Hunt ( verb) + er ( suffix) = hunter (noun)

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.

Otter

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 thisparagraph?

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 the start 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.

“Tiny” means? A- very big B- very small

Can you find a food chain

5 sea urchins are one of the foods otters like best. But when hunters killed the otters, there was no one to eat the urchins. The urchins destroyed the

kelp beds.

4 Kelp is also eaten by spiny animals called sea urchins. In eating, they may cut off stems on the ocean floor. The kelp then floats away.

Spiny

Sea Urchin

Answer by saying “ Y” or “ N”

The kelp eats sea urchins N The kelp floats after being eaten Y Otters eat sea urchins Y

6 Once the hunting stopped, the otters made a come back. 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 fishermen

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

grass Green plants

Kelp Sea 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

akci j

7- …………….squid 8- ……………..tuna 9-…..h ………anchovy 10-……………seal 11- ……g …..sea lion 12-……f …..herring

ldb