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"The Germination of Seeds" New Life PPT Courseware 3
1. Do you know what to pay attention to when sowing seeds in spring?
2. In the north, the ground is covered with plastic film after sowing in spring. Why is this done?
3. Why do seeds placed in warehouses generally not germinate?
4. What environmental conditions are needed for seed germination?
Think about it:
1. Which part of the seed structure develops first?
2. Which part of the new plant does the radicle, hypocotyl, and embryo develop into?
3. What changes happened to the cotyledons?
The structure of soybean seeds
There is a dark scar on the seed coat on the sunken side of the seed, which is the hilum, which is the trace of the seed being implanted in the pod. There is a small hole near the hilum, which is the seed hole.
When we pinch the seeds hard, water will flow out of the seed hole, indicating that the seed hole is the door for water to enter the seed.
The seed coat is very tough and protects the internal structure of the seed.
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.
1. Germ - develops into stems and leaves
2. Hypocotyl – connects stem and root
3. Radicle - develops into root
4. Cotyledon (only one).
1. Structure of seeds
1. Soybean - dicotyledonous plant
Two cotyledons, no endosperm
2. Corn - monocotyledonous plant
A cotyledon with endosperm
External conditions required for seed germination
Ask the question: What are the external conditions that affect seed germination?
Make a hypothesis: Seed germination requires water, air, and suitable temperature.
Recommended equipment: petri dishes, absorbent paper, labels, water, wheat seeds.
Design experiment: Each group selects one or more conditions for experimental design and designs a control experiment.
Happy practice:
1. Seed germination requires __________ and _____ and __________. (Pay attention to seed germination and _____)
2. The structure of soybean seeds is divided into __________, _____ and other parts (book P33). The seed coat serves to protect the seed. The embryo develops and grows and becomes the _____ of the plant; the radicle develops and grows and becomes the root of the plant; the cotyledons provide the nutrients needed for germination.
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