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"Seed Germination" PPT courseware
structure of seeds
Seeds are composed of embryo and seed coat. Seed coat - the protective layer on the outside of the seed, which protects the seed from external damage and prevents the invasion of pests and diseases.
What is an embryo?
Embryo - the young plant body enclosed within the seed, including the embryo, hypocotyl, radicle and cotyledons. The upper end of the hypocotyl is connected to the embryo, and the lower end is connected to the radicle. The cotyledons are attached to the hypocotyl. The embryo will develop into the main stem and leaves above ground, and the radicle will develop into roots. The function of cotyledons is to store nutrients or absorb nutrients for the growth of seedlings.
After the seed germinates, the radicle and embryo form the roots, stems and leaves of the plant respectively, and nutrients (starch, fat and protein) are stored in the cotyledons.
The seed coat is the protective layer outside the seed.
Environmental conditions for seed germination
1. Ask questions
Under what environmental conditions can seeds germinate?
2. Make assumptions
Please make assumptions based on the text information:
Seed germination needs
Suitable temperature, certain moisture, and sufficient air.
The following are the results of the experiment exploring "Environmental Conditions for Seed Germination". Please answer the questions based on the table analysis.
(1) There are _____ groups of controls in the table, which are _______________.
(2) The function of bottle No. 2 is _______, and the reason is _______________.
(3) If there are only bottles No. 2 and No. 3, which variable is used to test the effect of seed germination?
(4) If it is known in advance that the conditions in bottle No. 2 are the most suitable for seed germination, is it still necessary to set bottle No. 2 in this experiment?
Is necessary. If bottle No. 2 is compared with bottle No. 1, bottle No. 3, and bottle No. 4, only one condition is different for each. Bottle No. 2 can be used as a control for bottle No. 1, bottle No. 3, and bottle No. 4 respectively to eliminate the influence of other conditions on the experimental results except the conditions under study.
Divide the seeds with complete and full particles into two groups, A and B, and sow them separately at about 25°C. Group A is planted in fertile and moist soil, and group B is planted in poor and moist soil. The germination status of these two groups of seeds is: ( )
A B sprouts first and B A sprouts first
C sprouted at the same time D did not sprout at all
There is a riddle describing the peanut fruit: "The hemp house, the red curtain, and the fat white man lives inside." The hemp house refers to the peanut fruit ( ), the red tent refers to ( ), and the white fat man refers to ( )
A. Peel B. Seed C. Seed coat
D.Embryo E.Endosperm F.Cotyledon
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