"Trees in the Forest" Walking into the Woods PPT Courseware 2

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"Trees in the Forest" Walking 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, the Belgian scientist Helmont planted a 2.5-kilogram willow sapling into a wooden barrel filled with soil that had been weighed in advance. After this, he only watered the saplings with pure rainwater. In order to prevent dust from falling in, he also specially made a lid for the bucket. Five years have passed, and the willow tree has gradually grown up. After weighing, he was surprised: the weight of the willow tree increased by more than 80 kilograms, while the soil only decreased by less than 100 grams.

think

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

The conclusion drawn from this experiment: Due to Halmon's strict control of the experimental conditions, it was finally proved that the 82 kilograms of material added by the small tree were not all obtained from the soil.

2. What inspiration did Helmont’s research process give you? What further speculations can you make based on the findings in the Helmont experiments?

Enlightenment: Further speculation: the nutrients needed for plant growth are obtained from rainwater.

Think about it, what conditions should be met for plants to grow?

Plant growth should have:

Suitable temperature, water, sunlight, soil,...

Do you know what photosynthesis is?

Photosynthesis is a process in which plants, algae and certain bacteria convert carbon dioxide and water into organic matter and release oxygen under the irradiation of light.

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"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:

"Tree in the Forest" Into the Woods PPT Courseware 1. Science Story Helmont Experiment: Plant 2.5 kilograms of small willow trees in 100 kilograms of dry soil. In the next 5 years, only rainwater will be poured into the soil without fertilizer. After 5 years, dig out the willow tree completely and put the contents in the bucket...

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Update Time: 2024-12-09

This template belongs to science courseware E-education edition fifth grade science volume 1 industry PPT template

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