"Green plants are the producers of organic matter in the biosphere" PPT courseware 4

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"Green plants are the producers of organic matter in the biosphere" PPT courseware 4

From the previous study, we know that biology and the environment are a unified whole, and this unified whole is the ecosystem. Plants, animals, fungi and many microorganisms each perform different tasks in the ecosystem.

And what role do green plants play in the ecosystem? What are the components of the ecosystem?

Learning objectives of this class:

1. Explain that green plants produce organic matter through photosynthesis

2. Use experimental methods to test how green leaves produce starch under light

Key points to learn in this class:

1. Experimental design of green leaves producing organic matter under light

2. Understand the idea of ​​experimental design, that is, the understanding of a single variable-controlled experiment

Difficulties in learning this class: Design of controlled experiments

First, let’s introduce some knowledge (experimental principles)

1. Among the organic matter that makes up living things, there are mainly four types of organic matter:

Sugars, proteins, nucleic acids, lipids, and sugars in plants are mainly starch.

Each organic substance has its own unique identification method, for example: biuret reagent is used for proteins, Sudan dye is used for fats, etc. We can use these reagents to detect their existence.

2. Iodine solution is commonly used for identification of starch.

The iodine solution itself is light yellow. Once the starch meets the iodine solution, it will turn blue, so iodine solution is often used to test the presence of starch.

Let us take the purpose of the experiment and a few small questions into consideration while watching the video about this experiment.

first question:

1. What are the organic compounds produced by green plants?

It can be seen from the experiment that the exposed parts of the leaves turn blue when exposed to iodine solution. Who turns blue when exposed to iodine solution? ? ?

It shows that the exposed part of the leaves produces organic matter-starch

Does photosynthesis of plants only produce starch, an organic substance?

No, it is mainly sugars such as starch. Some sugars are also converted into proteins, lipids and other organic matter in plants.

Question 2:

Why use black paper to cover part of the leaves? ?

The reason for covering part of the leaves is to set the control:

See if light is a necessary condition for green plants to produce organic matter.

Control group: In the illuminated part, starch is produced

Experimental group: part not illuminated, no starch produced

What is photosynthesis?

1. The essence of photosynthesis is

Convert light energy into chemical energy and store it in organic matter.

3. The meaning of photosynthesis:

The organic matter produced by green plants through photosynthesis not only meets their own needs for growth, development, and reproduction, but also provides basic _______ for other organisms in the biosphere.

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"Green plants are the producers of organic matter in the biosphere" PPT courseware 7:

"Green plants are the producers of organic matter in the biosphere" PPT courseware 7 Learning objectives: What conditions are needed for green plants to produce organic matter? What are the main organic substances produced? 1. The purpose of the experiment is to test whether the organic matter produced by green leaves under light is starch.

"Green plants are the producers of organic matter in the biosphere" PPT courseware 6:

"Green plants are the producers of organic matter in the biosphere" PPT courseware 6 Review the past and learn the new 1. Comparing plant cells with animal cells, the structures that plant cells have but animal cells do not are: _________, _________, _________, among which _________ is photosynthesis. ..

"Green plants are the producers of organic matter in the biosphere" PPT courseware 5:

"Green plants are the producers of organic matter in the biosphere" PPT courseware 5 Think about it and discuss it. Besides providing a hidden habitat for frogs, what other important role do green plants play in the life of frogs? Indirectly provide a food source. (Because most frogs eat insects...

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Update Time: 2024-11-16

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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