"How Plants Absorb and Transport Water" Plant Life System PPT Courseware

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"How Plants Absorb and Transport Water" Plant Life System PPT Courseware

1. The characteristics of roots suitable for absorbing water

1. Structural characteristics of roots: a large number of root hairs

(1) Observe the roots of cultured soybean seeds after germination. What are the characteristics?

(2) Think about the significance of a large number of root hairs for water absorption?

A large number of root hairs can greatly increase the surface area for roots to absorb water and improve the efficiency of root water absorption.

2. The part where roots absorb water

3. External conditions for roots to absorb water

Cells absorb water: the concentration of the external solution is less than the concentration of the cell fluid

Cell water loss: the concentration of the external solution is greater than the concentration of the cell fluid

External conditions for roots to absorb water: The concentration of the soil solution is less than the concentration of the root hair cell solution

Small scale chopper

1. The roots of eggplant and cucumber seedlings that are ready for transplanting always have a lump of soil. why is that?

In order to protect root hairs, plants absorb water from the outside mainly through root hairs. If the root hairs are damaged, the plant can easily die from lack of water due to blocked water absorption.

2. If too much fertilization is applied in the field at one time, will the phenomenon of "seedling burning" occur? Why?

Excessive fertilization will cause the concentration of the soil solution to be greater than the concentration of the root hair cell solution. Not only will the roots of the plant not be able to absorb water, but it will seriously lose water and "dry up", that is, "burn the seedlings."

2. Water transport pathways

1. Explore: Can stems transport water?

Ask questions → make assumptions → formulate plans → implement plans → draw conclusions → express and communicate

2. Observe the experimental materials and think about the following questions

1. Cut the stem horizontally. What do you find on the cross section? Based on your structural knowledge of the stem, which part of the stem is turning red?

2. Cut the stem open longitudinally. What do you find on the longitudinal section? Based on your structural knowledge of the stem, which part of the stem is turning red?

3. What conclusions can you draw from this experiment?

Characteristics of sieve tube cells: Tubular living cells, the connection between the upper and lower cells has not disappeared.

The transport pathway of organic matter is from top to bottom

The organic matter produced in the leaves is transported to other organs along the sieve tube in the direction of leaf-stem-root.

What are the differences between ducts and sieve tubes?

Cut off a young plant stem, and sap will ooze out from the section of the stem. What is this sap? What structure of the stem does it ooze out from?

Why can't grass grow into towering trees?

That is, why can the stem grow thicker?

The cells of the cambium divide continuously to form xylem cells inward and phloem cells outward.

Because there is no cambium layer in the stems of herbaceous plants, they cannot grow into towering trees.

think about it

How are the organic matter in sweet potatoes, radish, and areca taro transported from leaves to roots and then stored?

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"How Plants Absorb and Transport Water" Plant Life System PPT Courseware 2:

"How Plants Absorb and Transport Water" Plant Life System PPT Courseware 2 The only part of the root that absorbs water is the mature area of ​​the root tip. There are a large number of root hairs in this part. The number is large and the cell wall is thin, which increases the area for roots to absorb water. Conduit (extracurricular knowledge) Conduit, plant...

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Update Time: 2024-09-30

This template belongs to science courseware People's Education Press Sixth Grade Science Volume 1 industry PPT template

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