"Seed Plants" What are the green plants in the biosphere PPT courseware 4

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"Seed Plants" What are the green plants in the biosphere PPT courseware 4

Observe the structure of seeds

Purpose requirements: 1. Understand the structure of seeds.

2. Learn how to observe the structure of seeds.

Materials and tools: Soaked beans and corn seeds, razor blade, magnifying glass, dropper, iodine solution.

1. Observe the structure of kidney bean seeds

(1) Take a bean seed and observe its appearance.

(2) Peel off the outermost thin layer of the seed, the seed coat, and separate and close the two cotyledons.

(3) Use a magnifying glass to carefully observe the cotyledons, radicles, embryos, and hypocotyls to see what their characteristics are.

2. Observe the structure of corn seeds.

(1) Take a corn seed and observe its appearance. Use a razor blade to split the corn seeds lengthwise down the center.

(2) Observe the structure of corn seeds, distinguish the locations of the embryo and endosperm, and try to distinguish the radicle, hypocotyl, germ and cotyledons.

(3) Put a drop of iodine solution on the cross section and see where the discoloration occurs. Where is the discoloration? What color did it become?

The structure of corn seeds:

Corn seeds also have a thick outer skin. But this layer is actually composed of two layers, the outer layer is the peel and the inner layer is the seed coat. Because after the corn seeds mature, the pericarp and seed coat are close together and difficult to separate, so they look like only one layer. Therefore, corn kernels are actually fruits, but they are just conventionally called seeds.

Challenge you, me, him

1. What is the function of seed coat?

It has the function of protecting the internal structure of seeds.

2. What is the function of the cotyledons of legumes?

Stores nutrients and is the source of nutrients for the embryo to develop into seedlings.

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

Corn endosperm contains starch

4. Which one has stronger vitality, seeds or spores?

Seeds have strong vitality. Because the spore is just a cell, it can only germinate if it falls into a warm and humid environment, otherwise it will quickly lose its vitality. Seeds are different. They can germinate in relatively dry places. If they encounter an environment that is too dry or cold, they can wait until the climate is suitable to germinate.

Why are angiosperms more suitable for terrestrial life than gymnosperms?

1. Fruits can protect seeds from insect bites

2. Fruits often have characteristics suitable for spreading.

Class exercises:

1. Multiple choice questions:

1. The following are all monocotyledonous plants: ( )

A. Sorghum, soybeans, peanuts B. Rice, wheat, soybeans

C.Rice, wheat, corn D.Wheat, broad beans, sorghum

2. Which of the seeds can develop into new plant larvae: ( )

A.embryo B.germ C.cotyledon D.radicle

3. In the structure of soybean seeds, the structure connecting the radicle and embryo is: ( )

A.Radule B. Hypocotyl C.Endosperm D.Cotyledons

4. Wheat seed nutrients are stored in: ( )

A. Cotyledons B. Endosperm C. Germ D. Radicle

2. Fill in the blanks:

5. According to the number of cotyledons in the seeds, green flowering plants can be divided into two categories: plants whose seed embryos have ________ are called dicotyledons; plants whose seed embryos have __________ are called monocots .

6. The nutrition of the rice we eat mainly comes from the _______ in the rice seeds.

The pictures above are schematic structural diagrams of corn seeds and bean seeds respectively:

In the picture above, 1 is _____ (corn also includes ____); 2 is ____; 3 is ____; 4 is ____; 5 is ____; 6 is ____; 7 is ____.

test you

1. There is a riddle describing peanut fruit: "A hemp house, a red tent, and a fat white man lives inside." The hemp house refers to the ______ of peanuts, the red tent refers to ______, and the white fat man refers to ______.

2. The common structure of seeds is ( )

A. Seed coat, embryo and cotyledons

B. Seed coat, endosperm and cotyledons

C. Seed coat, embryo

D. Seed coat, germ, embryo

3. The seed embryo of the following plants has two cotyledons ( )

A. Corn

B. Rice

C. Wheat

D. Peanuts

4. In the seed structure ( ) is a new plant body; rice is a rice seed ( )

A. embryo

B. Seed coat

C. Endosperm

D. Cotyledons

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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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