F2 IS WS07 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		光合作用
2	Raw material		原料
3	Energy source		能量來源
4	Product		產品
5	Starch		澱粉
6	By-product		副產品
7	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

carbo dioxide + water -------------------------------à food + oxygen                                                                                                                                chlorophyll

i      Label diagram:

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

                      Light energy

                                                                                     Oxygen released to air

                     carbon dioxide (from air)

                                                                                     food (as starch)

                                water (from soil)