"Germination of Seeds" Life of Angiosperms PPT Courseware 3

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"Germination of Seeds" Life of Angiosperms PPT Courseware 3

Review: The Structure of Seeds

1. Phaseolus vulgaris - dicotyledonous plant

Two cotyledons, no endosperm

2. Corn - monocotyledonous plant

A cotyledon with endosperm

1. After cutting the corn seeds open, adding iodine solution will make a certain part of the seeds turn blue. This is because the ( ) of the corn seeds

A. The embryo contains fat B. The cotyledons contain protein C. The endosperm contains starch D. The cotyledons contain starch

2. Which of the following statements about plants is incorrect ( )

A. Bryophytes have no roots, stems and leaves

B. Most algae are aquatic.

C. Coal is formed by ancient ferns

D. The vitality of seeds is generally stronger than that of spores

3. The following structures that are not embryonic are ( )

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

4. Angiosperms are more adapted to terrestrial life than gymnosperms, are more widely distributed, and have more types. The reasons do not include: ( )

A. Fruits can protect seeds.

B. Some fruits have wings or hairs on their surface, which are suitable for spreading by wind.

C. The seeds are larger.

D. Some fruits can induce animals to eat, which is convenient for sowing.

teaching objectives:

1. Through group cooperative exploration, clarify the environmental conditions and own conditions for seed germination.

2. Try to describe the general process of seed germination based on life experience and experimental observations.

3. Use the controlled experiment method to design and complete the research on "environmental conditions for seed germination", learn to control the experimental conditions, test the impact of different environmental factors on seed germination, and conduct scientific method training.

main difficulty:

1. Set up controlled experiment training and analysis of experimental phenomena in the exploratory experiment of seed germination environmental conditions.

2. Correct sampling method during sampling inspection.

Teaching method: Experimental method

1. Environmental conditions for seed germination

1. General process of inquiry:

(1) Ask the question: Under what environmental conditions can seeds germinate?

(2) Make assumptions: assumptions must be well-founded

(3) Make a plan: write down the steps and methods of the experiment

(4) Implementation plan: observation record

(5) Draw conclusions:

(6) Expression and communication:

2. The conditions for seed germination

Read the penultimate paragraph of P92, what kind of seeds can germinate?

P95 Exercise 4: Four kinds of seeds cannot be chosen:

1. The seeds are shriveled 2. The embryo is destroyed

3. The embryo is dead 4. It is dormant

7. A plump seed cannot germinate when planted in loose soil. The possible reasons are ( )

① Not enough moisture ② The seeds are dead ③ Not enough air ④ The temperature is too low ⑤ The seeds are dormant ⑥ No sunlight ⑦ Not enough nutrition

A. ①③④

B、③⑤⑥⑦

C. ①②③④⑤⑥⑦

D. ①②④⑤

3. Research activities to measure seed germination rate

During sampling testing, the influence of subjective factors should be avoided as much as possible.P93

1. Reasons for measuring germination rate

2. Measurement method—sampling test

3. Measurement steps

4. Measurement results:

number of germinated seeds

Seed germination rate = —————×100%

Number of seeds for testing

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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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