E-education edition fifth grade science volume 1

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"Trees in the Forest" Walking into the Woods PPT Courseware

1. Science stories

Helmont's experiment:

Plant 2.5 kg of small willow trees in 100 kg of dry soil.

In the next 5 years, only rainwater will be poured into the soil without fertilizer.

Five years later, the willow tree was dug out completely, the soil in the bucket was dried, and the willow tree and soil were weighed separately. It was found that the willow tree had increased in weight by 82 kilograms, and the soil had only lost 0.1 kilogram.

Let’s explore it together!

1. What did you discover from Helmont’s experiment?

The willow adds more weight than the soil takes away.

2. Where do the main nutrients required for plant growth come from?

air; rain...

2. Experiment

On a plant, select a leaf that grows well, cover the front and back of the leaf or part of the leaf tightly with black paper, and then place the plant in the sun.

After a while, uncover the black paper.

What happens to the leaves of the covered plants?

Why did this leaf change like this?

Is it related to the chlorophyll in the leaves?

3 Discussion

In addition to producing nutrients for themselves, the photosynthesis of green plants also provides what substances for the survival of animals and humans?

4. Summary and expansion

(1) What did you gain from this lesson?

(2) Collect information about tree growth outside class.

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For more information about the PPT courseware "Into the Woods, Trees in the Forest", please click the Into the Woods ppt, Trees in the Forest ppt tag.

"Tree in the Forest" Walking into the Woods PPT Courseware 3:

"Tree in the Forest" Into the Woods PPT Courseware 3 Helmont Experiment Thinking: The material in the soil has basically not decreased, so where does the increased weight of the willow tree come from? Chloroplasts are cells in plant cells that are surrounded by a double membrane and contain chlorophyll that can carry out photosynthesis...

"Tree in the Forest" Walking into the Woods PPT Courseware 2:

"Tree in the Forest" Into the Woods PPT Courseware 2 Helmont's Experiment More than 300 years ago, a scientist also thought about this problem. Let's take a look at what he thought and how he did it. In 1648, Belgian scientist Helmont planted a 2.5 kilogram...

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Update Time: 2024-12-04

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