"Main Groups of Plants" PPT courseware

Description

"Main Groups of Plants" PPT courseware

Part One: Situation Import

In summer, a layer of fluffy green stuff often grows densely on the damp ground or walls. What kind of plant is this?

learning target

1. Understand the living environment and main structural characteristics of mosses and ferns;

2. Learn more about the significance of mosses and ferns to nature and humans.

PPT on the main groups of plants, part 2: course exploration

Explore theme one

Bryophyta

Bryophytes generally grow in moist and shady environments and represent the transition form from aquatic to terrestrial.

There are approximately 4,000 species of bryophytes in existence. There are about 2,100 species in our country. This is a type of higher plant with a relatively simple structure. It generally grows in moist places and is a representative of the transition form of plants from aquatic to terrestrial. The plant body of the lower-level species is a flat leaf-like body; the plant body of the higher-level species has stems and leaves, but there are no real roots.

1. Main characteristics of bryophytes

They generally have stems and leaves, but there are no conductive tissues in the stems and leaves.

The fertilization process cannot be separated from water, so it is suitable to live in a damp place.

2. Common bryophytes

3. The role of bryophytes in the biosphere and their relationship with humans

(1) Helps form soil and prevent soil erosion

(2) Indicator plants for environmental pollution

Most of the leaves of bryophytes have only one layer of cells. Toxic gases such as sulfur dioxide can invade the leaf cells from the back and abdomen. Therefore, bryophytes are very sensitive to toxic gases such as sulfur dioxide and find it difficult to survive near heavily polluted cities and factories. People take advantage of this feature and use bryophytes as indicator plants for monitoring air pollution levels.

Explore theme two

Ferns

There are about 12,000 species of ferns in existence, widely distributed around the world. Most are soil-growing, stone-growing or epiphytic, and a few are wet-growing or aquatic. Likes a moist, warm environment. Ferns live in mountains, plains, forests, grasslands, creeks, rock crevices and swamps.

Wild ferns live in humid environments in forests and mountains, and their plants are much taller than bryophytes (as shown in the picture above). If you cut a fern open, you will find that its roots, stems, and leaves have tubes for transporting substances, that is, they have specialized conductive tissues.

1. Main characteristics of ferns

With the differentiation of roots, stems, and leaves, there are conductive tissues and mechanical tissues in the roots, stems, and leaves.

Ferns still need water for fertilization, so most of them are suitable for living in a humid environment.

2. Common ferns

3. The role of ferns in the biosphere and their relationship with humans

(1) Ancient ferns formed coal and provided humans with a large amount of energy. More than 200 million years ago, ancient ferns with a height of tens of meters grew lushly on the earth (such as the scale tree on the right). Later, these ferns became extinct. Their remains were buried underground and over time turned into coal.

(2) Edible

Fern, cabbage fern, water fern, purple fern, Guanyin rosette, etc. are all edible. The rhizomes of many kinds of ferns are rich in starch, which is called fern powder or mountain starch. It is not only edible, but also used as a raw material for wine making. The young leaves of the fern have a special fragrance and delicious taste.

(3) Medicinal

For example: Haijinsha can treat urinary tract infections and urethral stones;

Selaginella can cure edema and hemorrhage.

PPT on the main groups of plants, part 3: Class summary

1. Bryophytes

1. Common bryophytes: Calabash moss, wall moss, liverwort

2. Main characteristics of bryophytes:

They generally have stems and leaves but no conductive tissue; water is indispensable for fertilization; they live in a damp environment.

3. The significance of bryophytes to nature

(1) Maintain water and soil

(2) Monitor air pollution

2. Ferns

1. Common ferns: Maidenhair fern, Selaginella cypress, Guanzhong, Kidney fern, Azolla

and Cynophylla et al.

2. Main characteristics of ferns:

(1) It has true roots, stems and leaves, conductive tissue and relatively developed mechanical tissue, and is taller.

(2) Fertilization is inseparable from water, and most of them are suitable for living in a damp environment.

3. Economic significance of ferns

Edible; medicinal; ornamental; green manure; feed; ancient ferns → coal.

PPT on the main groups of plants, part 4: training to meet standards

1. Among the following plants, the one with conductive tissue in the body is ( )

A． Spirogyra B. Chlamydomonas C. Wall moss D. Kidney fern

2. The main function of the rhizomes of Cucurbita moss is ( )

A． Fixed plant body B. perform photosynthesis

C． Absorb nutrients D. Transport water and nutrients

3． The main reason why maidenhair ferns are suitable for living in humid environments is ( )

A． Roots, stems and leaves have conductive tissue

B． Strong ability to absorb and transport water and inorganic salts

C． Plants are very short

D． Fertilization is inseparable from water

Keywords: Free download of Biology PPT courseware for the second volume of the eighth grade edition of Beijing Normal University, PPT download of the main groups of plants, .PPT format;

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Update Time: 2024-07-30

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