"Growth of Plant Roots" PPT

"Growth of Plant Roots" PPT

Part One: Teaching Objectives:

1. Identify the basic structure of plant root tips and state the main functions of each part.

2. Describe the causes of root growth.

3. Observe root tips through the use of a microscope and develop corresponding observation skills.

4. Cultivate the spirit of courage to explore and bold practice.

Teaching focus:

1. Identify the basic structure of the root tip and state the main functions of each part.

2. Explore the growth part of the root tip and describe the reasons for root growth.

Teaching difficulties:

1. Describe the cell structure characteristics of each part of the root tip and the main functions of each part.

2. Experiment to explore the growth parts of roots.

Growth of plant roots PPT, part 2 content: Growth of plant roots

Have you carefully observed the growth characteristics of plant roots?

1. What is the main function of roots?

2. How do roots grow, and which part grows fastest?

[Little information]:

1. Someone once made a detailed observation of the root system of annual apple saplings and found that the total number of branches is as many as 50,000, while the trunk branches are only 10, which means that the branching capacity of the roots is thousands of times that of the above-ground parts.

2. A rye plant grows an average of 114.9 million root hairs every day, extending more than 80km every day. From germination to heading, there are approximately 15 billion root hairs.

[Question]: After reading these two pieces of information, do you have any questions?

Growth of plant roots PPT, part 3: Characteristics of roots

1. Structure and function of root tip

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

Observation guidance

Observe the root tips of the plant:

The slightly yellow cap-like body at the top of the root tip is the root cap.

The slightly darker upper part is the meristematic zone.

The white smooth part in the upper part of the meristematic zone is the elongation zone.

Some distance away from the top of the young roots, there are dense root hairs, too many to count. This is the mature zone.

2. Direction and characteristics of root growth

1. Root geotropism:

Affected by the earth's gravity and its own gravity

2. Hydrotropism of roots:

3. Root fertilization:

test you

①In your opinion, which area of ​​the root tip has the strongest ability to absorb water?

mature area. Root hairs in the mature zone expand the absorptive area of ​​the root.

②Why do we usually need to take soil with us when transplanting seedlings?

Transplanting with soil can protect the root hairs from damage and facilitate the survival of the transplant.

Plant Root Growth PPT, Part 4 Content: Choose One

1. Observe the structure of the root tip under a microscope. From the tip upward, it is ( )

A Root cap, meristematic zone, mature zone, elongation zone

B meristematic zone, root cap, mature zone, elongation zone

C root cap, meristematic zone, elongation zone, mature zone

D meristematic zone, root cap, elongation zone, mature zone

2. Among the following structures, the one that makes roots grow continuously is ( )

A Root cap and growth point B Elongation zone and maturity zone

C meristematic zone and elongation zone D root cap and elongation zone

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, growth of plant roots PPT download, .PPT format;

For more information about "The Life of Green Plants and the Growth of Plant Roots" PPT courseware, please click on the "The Life of Green Plants PPT and the Growth of Plant Roots" PPT tag.

"The Growth of Plant Roots" PPT courseware:

"Growth of Plant Roots" PPT courseware content of the first part: knowledge point 1 of roots, functions of roots such as fixation, support, absorption, conduction, storage and other functions. The degree of development of lush roots of vegetation. The relationship between root tips and root tips. Root tips. The most active part of life activities 2..