"Germination of Seeds" Life of Angiosperms PPT Courseware 2

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"Germination of Seeds" Life of Angiosperms PPT Courseware 2

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1. What are the control group and the experimental group?

Provide all the conditions in the hypothesis, called the control group.

If one of the conditions in the hypothesis is missing and the remaining conditions are met, it is called the experimental group.

2. What are the environmental conditions for seed germination?

Suitable temperature, certain moisture and sufficient air, etc.

Thinking: Will seeds germinate as long as they have appropriate environmental conditions?

An old king with no successors, in order to select the most honest young people in the country to inherit the throne, he distributed fried seeds to young people across the country, and ordered that whoever planted the most beautiful flowers would have the right to inherit the throne. Many teenagers cheated and exchanged seeds and planted beautiful flowers. Only one child kept his integrity and took good care of the seed that could not germinate. In the end, it did not germinate, let alone beautiful flowers. The king announced the screening results, and the honest child won respect and the throne...

2. The conditions for seed germination

1. The embryo has vitality

2. The seed is complete (embryo)

3. Not in dormant period

3. The process of 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?

How to measure the germination rate of seeds

1. Sampling testing - a small number of individuals are selected from the population as samples, and the results of the sample testing can reflect the overall situation.

——An appropriate number of samples can reduce the error, but too few will lead to too much chance factors.

——Try to avoid the influence of subjective factors and ensure that the sampling results are close to the overall true situation. Randomly selected

2. Environmental conditions - suitable temperature, certain moisture, and sufficient air

3. Seed germination rate = number of germinated seeds/number of seeds for testing × 100%

Practice questions

1. Peanut seeds can grow seedlings when planted in the ground because there are ( )

A. Adequate moisture B. Adequate air

C. Suitable temperature D. All three of the above

2. The reason why covering the ground with plastic film after sowing in early spring can promote early emergence is ( )

A. Increase humidity B. Increase temperature

C. Increase air D. Increase germination rate

3. Answer the questions based on the picture on the right:

(1) If this device is placed in a warm place, the seeds that can germinate are _________. The reason is that seed germination requires ____________, _____________, and __________.

(2) If the device is placed in the refrigerator, the thing that cannot germinate is _______________________________________________

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For more information about the PPT courseware "The Germination of Seeds and the Life of Angiosperms", please click the "Germination of Seeds ppt and the Life of Angiosperms" ppt tag.

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Update Time: 2024-07-02

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

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