"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 4

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"Algae, Moss and Ferns" What are the green plants in the biosphere PPT courseware 4

Seed plants: Among green plants, plants that can bloom and produce seeds are called seed plants.

There are more than 500,000 known species of green plants in the biosphere. They have different shapes and different living environments, and can be divided into four major groups: algae, mosses, ferns and seed plants.

1. Algae plants

Why does this water appear green?

Because there are a lot of algae growing in the lake, these small green creatures float freely in the water, making the spring water ripple with green waves.

1. Are algae unicellular or multicellular?

Algae are either single-celled or multi-celled, with relatively simple structures.

2. What environment do these algae plants live in?

Most live in water, and a few live in moist places on land.

3. Do algae plants have specialized roots, stems, leaves and other organs?

No differentiation of organs such as roots, stems, leaves, etc.

algae

Algae plants are diverse. There are single-celled ones and multi-cellular ones; some live in fresh water and some live in seawater. They have no differentiation of roots, stems and leaves.

For unicellular algae, one cell can complete all life activities. Multicellular algae can absorb water and inorganic salts from the environment almost all over the body, and can also perform photosynthesis, but they have no organs specifically designed to absorb and transport nutrients.

What role do algae plants play in the biosphere? What does it have to do with human life?

think about it

1. If the water in a fish tank is not changed for a long time, a green film will grow on the inner wall of the tank and the water will turn green. What is the reason?

If the water in the fish tank is not changed for a long time, the excrement and feces of the fish will increase the nutrients in the fish tank, and the algae will reproduce in large quantities, so the water in the fish tank will gradually turn green.

2. Bryophytes

Living in a dark and humid terrestrial environment, the plants are short and generally have stems and leaves. However, there are no vessels in the stem and the roots are very simple, called rhizoids. It can be used as an indicator plant to monitor the level of air pollution.

discuss:

1. What are the differences in the living environment between bryophytes and algae?

Algae plants mostly grow in water, while bryophytes live in dark, moist terrestrial environments.

2. From a morphological point of view, what are the main differences between bryophytes and algae? Does this have anything to do with their lives?

Algae plants do not have rhizome and leaf differentiation, while bryophytes have stem and leaf differentiation and rhizoids. This shows that bryophytes are more adapted to life on land than algae.

3. Ferns

living environment

dank environment

Morphology

There are roots, stems, leaves, and specialized conductive tissues.

So how does it reproduce?

practise

1. Among the following algae plants, which one is single-celled ( )

A Seaweed B Kelp C Spirogyra D Chlamydomonas

2. Which of the following is not the main characteristic of bryophytes ( )

A uses spores to reproduce

B generally has stems and leaves, but no conductive tissue

C has the differentiation of roots, leaves, and stems, and there are conductive tissues inside.

D. Fertilization is inseparable from water and is suitable for living in humid places.

3. The differentiated organs of bryophytes are ( )

A roots, stems, leaves B fruits, seeds

C stems, leaves D flowers, seeds

4. Compared with bryophytes, the reason why ferns are more suitable for living on land is ( )

AThe fertilization process does not require water

B There are xylem and mechanical tissues in roots, leaves and stems

C. There are conductive tissues in roots, leaves and stems

D spores reproduce

5. Which of the following plants has roots, stems, and leaves? ( )

A Kelp B Calabash moss C Spirogyra D Adiantum fern

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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: 2024-11-14

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

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