"What Affects Plant Growth" Plant Growth PPT Courseware 2

Description

"What Affects Plant Growth" Plant Growth PPT Courseware 2

Observation method: From the outside to the inside, first observe the external form, and then observe the internal structure.

Observation steps:

1. Observe the appearance of the seed - the hilum on the seed coat (the trace left on the seed coat after the seed matures and separates from the seed stalk. It is the channel through which the seed obtains nutrients from the mother.)

2. Test the toughness of the seed coat and think about the role of the seed coat.

3. Dissect the broad bean seeds, peel off the seed coat, and gently separate the two bean petals from the side opposite to the hilum.

4. When observing, first distinguish the embryo and the radicle. The connected part in the middle is the hypocotyl.

5. Two watercress are two cotyledons, think about its function.

1. The shape and structure of broad bean seeds

Embryo: The whole body composed of embryo, hypocotyl, radicle and cotyledons in broad bean seeds is called embryo. The embryo is the larvae of a new plant. It can be seen that the embryo is the main part of the seed.

2. The shape and structure of corn seeds

The whole body composed of embryo, hypocotyl, radicle and cotyledons in corn seeds is also called embryo. Its embryo is also the larvae of a new plant and is also the main part of the seed.

Exploration experiment

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 the right 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.

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?

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"What Affects Plant Growth" Plant Growth PPT Courseware:

"What Affects Plant Growth" Plant Growth PPT Courseware Experiment 1: Conclusion: Water affects the growth of plants! Experiment 2: Conclusion: Temperature affects the growth of plants! (1) Discussion: What do you think affects it? Water, temperature, sunlight, soil,...

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Update Time: 2024-11-22

This template belongs to science courseware People's Education Press third grade science volume 2 industry PPT template

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