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

Description

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

Think about it: What structure do kelp and seaweed eat?

think:

1. What environment do these algae plants live in?

Most algae plants live in water, and a few species live on moist surfaces.

2. How are the shapes of algae plants different from the common terrestrial plants you usually see? Do they have specialized roots, stems, leaves and other organs?

The structure of algae plants is relatively simple, without differentiation of roots, stems, leaves and other organs. Some species are single-celled organisms

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

Most algae plants live in water, while mosses mostly live in dark and humid terrestrial environments.

2. What are the differences in morphological structure between bryophytes and algae?

(Hint: Does moss have roots, stems, and leaves? Are there tendons on the stems—conducting tissues? What is the thickness and size of the leaves, and are there veins?)

The role of bryophytes

1. Indicator plants for detecting air pollution levels. Since 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 ventral sides, threatening the survival of bryophytes. Therefore, it is difficult to see mosses in places with serious pollution.

2. Maintain soil and water. Because most bryophytes grow in clusters, there are many gaps between plants, which can accumulate water and maintain soil and water.

Ferns have roots, stems, leaves, and conductive tissue. But the rhizomes are mostly hidden underground, and the above-ground parts are leaves and petioles.

spores

A spore is a reproductive cell. Mature spores are emitted from the leaf surface, fall into a warm and moist place, and germinate into a new plant.

P82 Exercise 2

If the water in the 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. Why is this?

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.

P82 Exercise 3

A coal-fired thermal power plant was built somewhere. After a few years, many of the green and fluffy bryophytes here disappeared. why is that?

Coal combustion will produce a large amount of harmful gases, such as sulfur dioxide, etc. Since 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 ventral sides, threatening the survival of bryophytes. Therefore, it is difficult to see moss around bituminous coal-fired power stations.

P82 Exercise 4

Some moss often grows on the shady side of the trunks of some trees, but not on the sunny side. why is that?

Bryophytes are adapted to live in dark, moist environments.

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

AThe fertilization process does not require water

B has rhizoids and real stems and leaves

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

D reproduces by spores

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

A kelp B calabash moss C liverwort D selaginella

Keywords: What are the green plants in the biosphere teaching courseware, algae mosses and ferns teaching courseware, People's Education Edition seventh grade biology PPT courseware download, seventh grade biology slide courseware download, what are the green plants in the biosphere PPT courseware download, Algae, mosses and ferns PPT courseware download, .PPT format;

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 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,..

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

"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 life...

File Info

Update Time: 2024-10-22

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

Preview