"Seed Germination" PPT Courseware 3

Description

"Seed Germination" PPT Courseware 3

practice

1. In order to get seedlings of a certain plant as quickly as possible, ( ) is generally chosen when selecting seeds.

A. Young seeds that have just been picked B. Seeds that have passed the dormant period

C. Freshly harvested seeds that are about to mature. D. Seeds that have been stored for more than 3 years.

2. The reason why rice and watercress cannot grow seedlings in fertile soil is ( )

A. No seed coat B. Insufficient soil fertilizer

C. No radicle D. No complete embryo

Knowledge preparation:

1. General steps of inquiry

Ask questions, make hypotheses, formulate plans, implement plans, draw conclusions, express and communicate

2. What is a controlled experiment?

Ensure that the conditions being studied are different and other conditions are the same.

3. What is the key to the inquiry experiment?

Set up a controlled experiment and control the variables to ensure that except for the only variable, other conditions are the same and appropriate.

Group work requirements

Members of the group first ask each other about what they do not understand in the experiment.

Each member communicates his or her own experimental process, and the team leader is responsible for summarizing the experimental results and drawing the experimental conclusion of the group.

Problems that cannot be solved by this group can be raised during class communication.

Each group should select a representative to communicate within the class.

Use your brain and think about it

Ask the question: What are the environmental conditions for seed germination?

Make a hypothesis: Seed germination requires the right amount of water, the right temperature, and plenty of air.

making plans:

1. Prepare three complete and plump soybean seeds, a beaker filled with water and a wire with a hook.

2. Place three soybean seeds in a beaker as shown in the figure, so that the upper one is completely exposed to the air, the middle one is half soaked in water and half exposed to the air, and the lower one is completely soaked in water.

3. Place the beaker at a suitable temperature. Observe again after a few days to see which seed germinates first.

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Update Time: 2024-09-08

This template belongs to science courseware Fourth-grade science volume 2 of the E-education edition industry PPT template

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