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"The Mystery of Roots and Paths" PPT courseware on the secrets of plant life
The mystery of roots and stems
The students made information cards about plant organs that they reviewed and collected. Are the contents on the information cards correct? Taking roots and stems as an example, can you design some experiments to study them?
Observing these roots with different shapes, can they be classified according to certain standards?
The collection of plant roots is called the root system. Divided into tap root system and fibrous root system.
In the tap root system, the main root is obvious, and lateral roots grow from the main root. The main root is strongly developed and distinct from the lateral roots in terms of thickness and length. However, in the fibrous root system, the main root cannot be clearly distinguished.
Activity 1: Understand the roots of plants
1). Tap root system:
2). Fibrous root system:
3).Abnormal roots:
Can plant roots really absorb water? How to prove it?
Place the experimental device in the sun. After a period of time, it can be observed that the amount of water in the container is significantly reduced, indicating that the roots of the plant can absorb water.
Why didn’t the roots “gain weight” after absorbing water? Where did all this moisture go?
The function of roots: to anchor the plant and absorb water and nutrients.
The function of the stem: transport water and nutrients, support branches, leaves, flowers and fruits.
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