As far as I understand Homework(2) and (3) are connected... Sorry for too late homework...
Everyday concept( plants, animals)---->Academic Science concept (producer, consumer, decomposer)
(P.S.. I used "Why Question" in "Decomposer" part.)

T: Look! This is a flower. Is it a plant or an animal? (closed-->open)
S: plant.
T: Yes. In Food Chain, plants are called producers. (closed) Why are plants producers? (open)
S1: 양분..eat...
T: Do you know 광합성, Photosynthesis?
Ss:Yeah.
T: The plants make nutrition by themselves. "Produce" means "make"
plants는 스스로 양분을 만들 수 있기 때문에 producer라고 해요. (closed)
T: Now, Let's read. "consumer"!

Ss: consumer
T: "consume" means "use". Animals use what? (open)
S1: eat plants..
T: Animals eat plants and other...?
S2: other animals
T: Right. Animals can not make nutrition by themselves.
They have to use plants or other animals.(closed)
Then, I'll ask again. Are animals producers or consumers?
Ss: Consumers!
T: Let's say. "Decomposer"!
Ss: Decomposer!
S1: 곰팡이..
T: Decomposer breaks down the dead body. If owl dies, the body is decayed.. (썩는 흉내를 냄..)
S2: 썩어
T: and Decomposer make the body into soil.
Can you find any example of decomposers? Tell me anything about decomposers. (open)
S3: 박테리아
S4: Blue 곰팡이
T: Yeah. (Pointing the PPTpicture) fungi, mushroom, worm..
These are kinds of decomosers (closed)
S1: (킥킥거리며) 펑자이 펑자이..
T: What is fungi, 정수?
S2: 곰팡이
T: Right. Why should they break down the body ? (open)
S2: 양분을 어쩌구 저쩌구...
T: You can say the answer in Korean. 왜 시체를 분해해야만 할까?
S3: 식물에 양분을 공급하려고
S4: 분해를 안 하면 시체만 쌓이고..따라서 분해를 해야 땅도 비옥해지고 식물도 더 잘 자라기 때문에
T: Yeah. They break down the body and make new nutrition. 새 양분. (closed)
New nutrition goes into where? (open)
Ss: 땅
T: Soil and then plant. Plant로 다시 돌아가는 거예요. (closed)