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"Seed Plants" What are the green plants in the biosphere PPT courseware 5
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?
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?
(1) Some fruits have wings or hairs on their surface, which are suitable for _________
(2) Some fruits have ________ or mucus on the surface, which can adhere to the surface of animals _______
(3) Some fruits are _______ in color and have sweet slurry or pulp, which can induce animals to eat. Many seeds can be _______ along with the discharge of animal feces.
dispersal of seeds
1. There are wings or hairs on the surface, suitable for flying in the wind;
2. There are stinging hairs or mucus on the surface, which can adhere to the body surface of animals and spread;
3 Some fruits are brightly colored and have sweet pulp, which induces animals to eat them. After animals eat the fruits, the seeds are excreted in their feces and spread.
Summary
1. Seed plants: Among green plants, plants that can bloom and produce seeds are called seed plants.
2. Structure of seeds
seed coat
embryo
radicle
Hypocotyl
germ
Cotyledons
endosperm
3. Gymnosperms: The seeds are naked plants without pericarp covering.
Angiosperms: Plants whose seeds are covered by a pericarp are called angiosperms.
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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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