F2 1st Term IS WS 07 Answers

1st Term WS 07 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

7.4       How do green plants obtain energy?

A. The process of photosynthesis

i      Words to know:

	English term	Write the words again	Chinese term
1	Photosynthesis	Photosynthesis	葉綠素
2	Raw material	Raw material	原料
3	Energy source	Energy source	能量來源
4	Product	Product	產品
5	Starch	Starch	澱粉
6	By-product	By-product	副產品
7	Chlorophyll	Chlorophyll	葉綠素

i      Fill in the blanks:

1        Green plants can make their own food by photosynthesis. The raw materials are        carbon dioxide obtained from the air and water obtained from the soil.

2        Light energy is required in photosynthesis. It is absorbed by chlorophyll in green leaves and other green parts of the plants.

3        The food produced is usually stored in the form of starch. And oxygen is produced as a By-product that released into the air.

4        Write down the word equation of photosynthesis.

                                                             Light energy

          Carbon dioxide + water -----------------------------à food (starch) + oxygen

                                                                chlorophyll

5        The main aspects of photosynthesis:

Raw materials	Carbon dioxide (from air)	Water      (from soil)
Energy source	Light energy       (absorbed by chlorophyll)
Product	Food (in form of starch)
By-product	Oxygen             (released to air)

i      Label diagram: Label the following picture to show the process of photosynthesis. (Hints: Fig.7.12)

           Diagram should include: (Please refer to textbook P.35)

-         Light energy (from sun)

-         Carbon dioxide (from the air)

-         Water (from the soil)

-         Food (starch)

-         Oxygen (released into the air)