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"Which way does the stem grow?" PPT courseware
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After the seed germinates, in what direction will the plant's roots grow?
The roots of plants grow downward. During the growth of the plant, will the roots continue to grow downward?
Plants are attracted by the earth's gravity and grow into the ground, which is called geotropism of plants
The roots of plants also have the characteristic of growing in the direction of moisture, which is called hydrotropism of plants.
Observe the trees on the roadside. What do you notice? What does this phenomenon indicate?
Through observation and experiment, we concluded:
Plant stems are phototropic
As a plant grows from a seedling to a towering tree, what changes and functions do the stems have?
Changes in external morphology of plant stems at different growth stages
Seedling stage: The stems are crystal clear and transport water
Growth stage: branches and leaves are blooming, and the stem is the fastest growing part
Mature stage: The thick stems support the entire plant
Discussion summary: The role of stems
Stems support the plant and transport water and nutrients
After-school development:
Observe the structures of various plants in life and use the knowledge you have learned to analyze and understand them!
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