Unit 4  Green World教案

s: glad to. first, put some soft soil in the pot or box; second, put the seeds of soybeans on a wet cloth or put them in the water; then, put the seeds into the soil. after several days, the seeds come into bud and out of the soil. later on, water them every two days till the green leaves grow.
for this step, the teacher can (or ask the students to ) make a short film to present the stages of growing soybeans.

step iv  discussion
t: well done, kate. soybeans are easy to grow. now imagine you want to plant something else in your garden plot, work in groups and decide which plants, vegetables or flowers your  group would grow, how to plant them, how to take care of them, when to harvest or pick them.

step v  oral-presentation
ask several students to show their answers to the class.
sample answers:
carrots are loaded with vitamins, and are nutritious. on top of being good for you, carrots taste good, too. so our choice is carrot.
(1) before planting, work the soil deeply.
(2) sow them very thinly, about 1/4 inch deep. cover them with a fine garden soil. or sprinkle them on top of the soil, and lightly water them into the soil.
(3) keep carrots well weeded early in the season. they are easily overcrowded, with any competing weeds usually winning out.
(4) begin to harvest carrots as “baby” size, thinning the row as you harvest. once you begin picking, you can harvest as needed.

step vi  talking
t: really interesting. but how do the plants grow?
read the instruction on page 170 in the workbook to the students, then ask the students to work in pairs to describe “the process of photosynthesis of plants” in their own language.
a description of basic photosynthesis:
photosynthes is the process by which green plants and certain other organisms transform light energy into chemical energy. during photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

step vii  assignment
t: in this class, we’ve learned a lot about plants and planting. ask your parents or others to teach you more about planting, if you are interested in. and please do exercise 3 on page 30 in the textbooks