"The Growth of Plants" Life of Angiosperms PPT Courseware 3

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"The Growth of Plants" Life of Angiosperms PPT Courseware 3

Think about it, discuss it

A well-growing rye plant has about 14 million roots, and its total length is 600 kilometers. These roots have a total of 15 billion root hairs, with a total length of 10,000 kilometers. Accurate calculations show that the total area of ​​this rye plant is 130 times the area of ​​stems and leaves. What does this phenomenon mean for Rye's life?

The root system is developed and the number of root hairs is large, which increases the surface area for absorbing water and inorganic salts, which is beneficial to the survival of the plant.

1. Growth of young roots

The short section from the top of the root to the root hairs is called the root tip.

The root tip is the fastest growing part of the young root.

Observe the structure of root tips and root hairs

1. First observe the young roots directly with the naked eye and find the white "fuzz" growing on the young roots. This is the root hair. Look closely at the root hairs through a magnifying glass.

2. Observe the permanent sections of the root tip through a microscope to see what are the characteristics of the cells in different parts of the root tip.

Comparing different parts of the root tip, which part grows the fastest?

discuss:

1. Choose a young root and place it on _____. Use a pen to draw four lines from the tip of the young root upward. The distance between these four lines should be _________

2. When the data obtained by several students is different, how should these data be processed in order to obtain data that is close to reflecting the real situation?

The average of several sets of data should be calculated

3. If you are the only one doing this research activity, is it enough to use only one seedling? Why?

not enough. Only one seedling is used for experiments, and there is a lot of chance and error.

expand:

1. What is the significance of a large number of root hairs on a root?

Having more root hairs can greatly increase the surface area for roots to absorb water and improve the efficiency of roots in absorbing water.

2. When transplanting plants, there is often a lump of soil at the roots. why is that?

①Can prevent root hairs from being damaged

②Can maintain moisture

3. Plant growth requires nutrients

Whether it is an increase in the number of cells or an increase in cell volume, nutrients—water, inorganic salts, and organic matter—need to be continuously replenished.

Green leaves produce organic matter through photosynthesis

Roots absorb water and inorganic salts from the soil

Fertilizer is needed to grow crops, and fertilizer is also used to grow flowers and grass. The main function of fertilizer is to provide inorganic salts for plant growth.

Consolidate and improve

1. The part where roots grow fastest is _______

2. The growth of roots depends on the increase in the number of cells in the ______ zone on the one hand, and the increase in the volume of cells in the ____ zone on the other.

3. Cells in the _____ area divide to produce new cells.

4. Are there meristems in the buds?

5. New branches develop from ___.

6. The growth of plants requires a variety of inorganic salts, of which the most needed are inorganic salts containing ____, ____, and ____.

Class exercises

1. The formation of a large number of root hairs at the root tip is beneficial to ( )

A. Root absorption B. Root stability

C. Root fixation D. Root support

2. The main part of the roots that absorbs water and inorganic salts is ( )

A, root cap B, elongation zone C, meristematic zone D, mature zone

3. Transplanted cucumber seedlings always have a lump of soil at their roots. The purpose is ( )

A. Protect young stems B. Protect root hairs

C. Prevent water evaporation D. Prevent wilting

4. The reason why perennial woody stems become thicker year by year is ( )

A. Phloem cells are constantly dividing. B. Xylem cells are constantly dividing.

C. Cambium cells continue to divide D. Xylem cells continue to grow

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"The Growth of Plants" Life of Angiosperms PPT Courseware 6:

"The Growth of Plants" Life of Angiosperms PPT Courseware 6 Think about it and discuss it (page 96) A well-growing rye plant has about 14 million roots, and the total length is 600 kilometers. These roots have a total of 15 billion root hairs, with a total length of 10,000 kilometers. Precise calculations show:..

"The Growth of Plants" Life of Angiosperms PPT Courseware 5:

"Growth of Plants" Life of Angiosperms PPT Courseware 5 Anatomy of Holly Branches 1. Observe the cross section of the stem and see how many layers it is divided into? 2. Peel off the bark with your hands. Tear the bark with your hands. Is it tough? 3. Look at the inside of the bark. What color is it? Touch it with your hand...

"The Growth of Plants" Life of Angiosperms PPT Courseware 4:

"Growth of Plants" Lifetime of Angiosperms PPT Courseware 4 1. Growth of young roots Root growth depends on the one hand to increase the number of cells in the meristematic zone (with meristematic tissue) and on the other hand to increase the volume of cells in the elongation zone. (The last sentence of book P97) Classification of buds: 1...

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Update Time: 2024-09-19

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