"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware

Description

"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware

learning target

1. Identify common algae and bryophytes

2. Outline the main characteristics of algae and bryophytes and their relationship with humans

algae plant

Single-cell freshwater algae: such as Chlamydomonas

water cotton

Why does Spirogyra float on the water when there is enough sunlight?

1. What color is kelp?

brown.

2. What parts can kelp be divided into?

There are three parts: frond, stalk, and fixator.

3. Does kelp have real roots, stems and leaves?

No differentiation of roots, stems and leaves.

Main characteristics of algae plants

1. Living environment: Most live in water.

2. Morphological structure: Simple structure, no differentiation of roots, stems and leaves.

3. Reproduction method: Reproduction with spores.

The relationship between algae and humans

It provides food and oxygen to fish and is an important source of oxygen in the atmosphere (accounting for 95%). Some are available for human consumption and medicinal purposes.

The leaves of bryophytes have only one layer of cells, and toxic gases can invade dorsally and ventrally. Therefore, it can be used as an indicator plant to monitor the level of air pollution.

Other uses of bryophytes

1. Accelerate rock weathering, promote soil formation, and be a pioneer of nature;

2. Promote the terrestrialization of swamps;

3. Maintain water and soil and prevent soil erosion.

Bryophyte characteristics

1. The structure is simple and the plants are short.

2. Most of them live in dark and humid terrestrial environments, such as wall moss and gourd moss.

3. There are differentiation of stems and leaves, but no conductive tissue. There are rhizomes, which rely on leaves to absorb water and inorganic salts.

fern

How do ferns reproduce without flowers or seeds?

Fern characteristics

1. Live in dark and humid environment, such as kidney fern, fern, selaginella, maidenhair fern, azolla, spinulosa, guanzhong, etc.

2. The plant body is divided into roots, stems, and leaves, and has conductive tissue; but the stems are mostly hidden underground, and the above-ground parts are leaves and petioles.

3. Can produce spores to reproduce offspring.

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For more information about the PPT courseware "What are the green plants, algae, mosses and ferns in the biosphere", please click the What are the green plants in the biosphere ppt, algae, mosses and ferns ppt tag.

"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 7:

"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 7 Preview Outline 1. How many green plants are there in the biosphere and how many species are there? What types of groups can it be divided into? 2. What kind of environment do algae, moss and ferns live in?

"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 6:

"Algae, Moss and Ferns" What green plants are there in the biosphere PPT courseware 6 Think about it: What structures do kelp and seaweed eat? Thinking: 1. What environment do these algae plants live in? Most algae plants live in water, and a few species live in...

"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 5:

"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 5 1. Algae The spring beauty of the West Lake has returned, and the spring water is green. When the sun rises, the flowers in the river are as red as fire, and when spring comes, the water in the river is as green as blue. Observation and thinking 1. What environment do these algae plants live in? 2,..

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Update Time: 2024-06-28

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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