"Seed Plants" What are the green plants in the biosphere PPT courseware 6

Description

"Seed Plants" What are the green plants in the biosphere PPT courseware 6

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?

Special Note

Corn, wheat, rice and other plants

The peel and seed coat are closely together

A grain is a fruit, not a seed

Replenish:

Common dicotyledonous plants include cotton, soybeans, peanuts, sunflowers, sweet potatoes, potatoes, apples, tobacco, mint and various melons. Corn is a monocotyledonous plant.

discuss

1. What is the function of seed coat? What is the function of the cotyledons of legumes?

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

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

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

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?

The endosperm of corn contains starch

The meaning of producing seeds

(1) Which one has stronger vitality, spores or seeds? Why?

Seeds are more viable.

Because a spore is just a cell, the environment is not suitable for it to lose its vitality quickly. The seeds are rich in nutrients and protected by the seed coat.

(2) What is an important reason why seed plants have become the dominant group of terrestrial plants?

Can produce seeds

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

What does the fruit do? Is it related to the dispersal of seeds?

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 structure ( ) will develop into a new plant body in the future.

A. embryo

B. Seed coat

C. Endosperm

D. Cotyledons

4. The main difference between bean seeds and corn seeds is ( )

A. The position of the embryo is different

B. Different appearance

C. Different seed coats

D. The number of cotyledons contained in the embryo is different, and the locations for storing nutrients are different.

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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: 2024-11-20

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

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