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"Tree in the Forest" Walking 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 organelles in plant cells that are surrounded by a double membrane and contain chlorophyll that can carry out photosynthesis.
Chloroplasts may have originated from ancient cyanobacteria. In a long-term symbiosis, ancient cyanobacteria formed the chlorophyll from which plants emerged.
Chloroplasts of higher plants exist in the cytoplasmic matrix. Chloroplasts are generally green, flat, fast-flowing ellipsoids or spheres, and their shape and distribution can be observed with a high-power optical microscope.
Conditions required for photosynthesis: light
Organs of photosynthesis: chloroplasts
Raw materials for plants to produce nutrients: water, carbon dioxide
Discussion: In addition to producing nutrients for themselves, the photosynthesis of green plants also provides what substances for the survival of animals and humans?
The meaning of photosynthesis:
1. Provide nutrients needed by plants themselves
2. Provide nutrients needed by animals and humans
3. Absorb carbon dioxide and release oxygen necessary for humans and animals.
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"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...
"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...