"Plant Roots and Material Absorption" PPT

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"Plant Roots and Material Absorption" PPT

Part One: Introduction to Root System

(1) Root system of plants:

All the roots of a plant are called the root system.

A root system with clearly developed main roots and lateral roots is called a tap root system.

A root system without obvious main and lateral roots is called a fibrous root system.

The main differences between the two types of root systems:

Are there clearly developed main roots and lateral roots?

(2) Function of root

Fixation: The roots of the plant are very developed and have a larger growth range than the branches and leaves, firmly fixing the plant to the ground.

Absorption: Water and inorganic salts in the soil are absorbed into the plant through the roots.

(3) Distribution of root system

The distribution of plant roots in the soil is closely related to the type of plant and the external environment, such as soil structure, fertility, ventilation conditions and moisture conditions.

Plant roots and material absorption PPT, part 2 content: picture reading and discussion

Understand the structure of the root tip:

1. What four parts can the root tip be divided into? What are the structural characteristics of each part of the cell? What is the function of each part?

2. What are the parts that can make roots grow longer?

3. What is the main part of the root tip that absorbs water? What is the function of root hairs?

1. The root cap is at the forefront of the root tip, which plays a protective role and facilitates the continuous growth of roots in the soil. The structural characteristics of root cap cells are: thin cell walls and loose outer layers.

2. The cells in the meristematic zone are closely arranged, with thin cell walls, dense cytoplasm, no vacuoles, and large nuclei; cells in the meristematic zone have the ability to divide, which can increase the number of root cells.

3. Cells in the elongation zone stop dividing but elongate significantly. The cell walls are thin and have smaller vacuoles, so they can grow faster, thus making the roots grow longer and keep extending deeper into the soil.

The length of the root can continue to increase because: __________ cells can divide and __________ cells can elongate.

Plant roots and substance absorption PPT, part 3 content: Class exercises:

1. The main part of the root tip that absorbs water is ( )

(A) Root cap (B) Root hair area (C) Meristem (D) Lateral roots

2. Among the following root tissues, the part that can make roots grow quickly is ( )

(A)Meristematic zone (B)Elongation zone

(C)Root hair area (D)Root cap

3. As the saying goes: "The height of a tree is the depth of its roots." Large trees with deep roots are a common phenomenon in nature. Which of the following is wrong about this phenomenon? ( )

(A) Plant roots can firmly fix the plant in the soil

(B) Roots deeply rooted in the soil are conducive to absorbing water

(C) The organic matter obtained by the roots comes from deeper soil

(D) Larger trees and deeper roots have stronger transpiration capabilities.

4. Xiaoli wants to transplant a rose flower. What should she do? ( )

A. Carefully uproot the rose flowers and move them

B. Carefully uproot the rose flowers, wash the roots and transfer them

C. Carefully dig up the roses with their roots and soil before moving them. Try not to damage the root system.

D. All the above methods are possible

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, plant roots and material absorption PPT download, .PPT format;

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"Plant Roots and Material Absorption" PPT courseware:

"Plant Roots and Material Absorption" PPT courseware Part 1: Discussion 1. What are the fundamental reasons for the continuous growth and elongation of roots? The division of cells in the root apical meristematic zone and the differentiation and elongation of cells in the elongation zone. 2. In agricultural production, transplanting crop seedlings...

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Update Time: 2024-10-13

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