"Seed Plants" What are the green plants in the biosphere PPT courseware 2

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"Seed Plants" What are the green plants in the biosphere PPT courseware 2

1. Structure of seeds

[Autonomous learning] (P79~81)

Point out the names of each part and their respective functions

Compare the similarities and differences between bean seeds and corn seeds

Question: What are the parts of a seed?

[Think about it, discuss it]

At the beginning of the 20th century, ancient lotus seeds were discovered in the eastern suburbs of Dalian Pulandian, Liaodong Peninsula, with a lifespan of more than a thousand years. Because the outer skin of lotus seeds is composed of hard fence-like cells, and the cell walls are composed of cellulose, it can prevent the internal infiltration and leakage of water and air; in addition, they are buried in peat soil with low temperature, low humidity, and little microbial interference. It can still germinate, take root, and bloom later.

Experiment: Observe the structure of seeds

discuss:

1. What is the function of seed coat? What is the function of the cotyledons of leguminous plants?

2. Which part of the seed can develop into a plant in the future?

3. Turning blue when exposed to iodine is a characteristic of starch. What does it mean that corn endosperm turns blue when exposed to iodine?

4. List and compare the similarities and differences between bean seeds and corn seeds.

The structure of corn seeds:

Corn seeds have two skins. The outer layer is the peel and the inner layer is the seed coat. After the corn seeds mature, the pericarp and seed coat are close together and difficult to separate. Therefore, corn kernels are actually fruits, but they are just conventionally called seeds.

Endosperm: stores nutrients

Cotyledon: a single leaf that stores and transports nutrients

Germ: The part containing young leaves that develop into stems and leaves.

Hypocotyl: The part that connects the germ and radicle.

Radicle: the end opposite the germ that develops into the root

group discussion:

1. Which one has more vitality, spores or seeds? Why?

Seeds have greater vitality.

Because a spore is just a cell, it can only germinate in a warm and humid environment, otherwise it will lose its vitality quickly. Seeds are different and can also germinate in relatively dry places; if they encounter an environment that is too dry or cold, they can stay until the climate Germinate again when appropriate.

2. Seed plants are more adapted to the terrestrial environment and have become the dominant group of terrestrial plants. What is one of the important reasons?

capable of producing seeds

[Autonomous learning] (P82~86)

1. Algae, mosses, and ferns mainly reproduce by producing _____, while most grains, fruits, and vegetable plants can produce _____ for reproduction and are _____ plants.

2. The seeds of some seed plants are _____, and there is no _____ outside to protect them. These plants are called gymnosperms, such as _____. The seeds of some seed plants are _____, and these plants are called angiosperms, such as _____.

3. The reason why seed plants are widely distributed is that they have well-developed ______ drainage tissue and the ability to ______, and the fruits they bear can protect the ______ inside, and many fruits can also help spread _______.

question:

Which common plants are angiosperms? What are gymnosperms? How to distinguish them?

Gymnosperms: The seeds are exposed and there is no pericarp covering the seeds.

The pine seeds are exposed and have no outer skin to protect them. The pine cones you see are not fruits. The wooden structures are scales. There are gaps between the scales, and the base of the scales are exposed seeds.

[Standard inspection]

1. Compare pine trees and peach trees. The main difference between them is ( ).

A. The seeds of pine trees are covered with pericarp.

B. Pine trees have no fruits and their seeds are exposed

C. The pine cones of the pine tree are covered with peel

D. The pine cones of pine trees have scales

2. Which of the following statements about the common characteristics of apples and pine trees is incorrect ( )

A. All can produce seeds B. Roots, stems, and leaves are all well developed

C. The fertilization process is out of water. D. The seeds are covered with pericarp.

3. Which of the following characteristics of fruits has nothing to do with seed dispersal ( )

A. The outer peel of walnuts is fleshy, but the inner peel is very hard and requires a hammer to break it open.

B. Maples, poplars, willows and other fruits have wings or hairs on their surfaces, which can float in the wind.

C. There are bristles or mucus on the surface of fruits such as Xanthium sibiricum and Pleurotus lucidum, which can adhere to the surface of animals.

D. The fruits of tomatoes, watermelons, etc. are brightly colored and have sweet slurry or pulp. Animals like to feed on them.

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

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Update Time: 2024-11-22

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

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