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"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 3
Classification of green plants
The first three types of plants do not produce seeds. When they grow to a certain stage, they produce reproductive cells called spores. Such plants are called sporophytes.
Spores are not seeds and will germinate into new plants when they fall in a warm and moist place.
1. Algae plants
Divided into two categories:
Freshwater algae - algae that live in rivers, lakes, and ponds.
Seaweed - algae that live in seawater.
marine algae
1. Living environment: Most of them live in water and reproduce by spores.
2. Morphological characteristics: Plants can be unicellular or multicellular, but there is no differentiation of roots, stems, leaves and other organs.
3. 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.
2. Bryophytes
Note the contrast with the algae!
1. Living environment: Live in a damp terrestrial environment and reproduce by spores.
2. Morphological characteristics: The plant is short and weak, generally with stems and leaves, but there are no vessels in the stems (that is, no conductive tissue), no veins in the leaves, and the roots are rhizoids.
1. Bryophytes can be used as indicator plants for air pollution levels.
2. It has the function of retaining water and soil.
3. The pioneering of nature.
4. Make the swamp terrestrial.
3. Ferns
1. Living environment: Most live in a damp environment.
2. Morphological characteristics: The plant has only roots, stems, leaves, and conductive tissue. It does not bloom, has no fruits and seeds, and relies on spores to reproduce its offspring.
The above-ground parts are actually its leaves, and its stems are located underground. Its leaves are large compound leaves. The structure on the ground that looks like a "stem" is its petiole, and the structure that looks like a "leaf" is the leaflet on the compound leaf.
Use and practice
1. Compared with bryophytes, ferns have a stronger ability to adapt to terrestrial life because ( )
A. The whole body can absorb water and inorganic salts. B. It has stems and leaves differentiated and can grow densely.
C. Roots, stems, and leaves have conductive tissues. D. A large number of spores can be produced under the leaves.
2. Seaweed is an algae plant containing iodine and its living environment is ( )
A. land B. forest C. river D. ocean
3. When a certain amount of sulfur dioxide is added to a dense environment where the following four plants are planted, which plant will die first ( )
A. Algae B. Bryophytes C. Ferns D. Seed plants
4. I lost my way in the woods and saw that one side of the tree trunk was covered with moss, but not the other side. Based on this, it can be determined that the side where moss grows is ( )
A. South B. North C. East D. West
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"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 7:
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