"The Discovery of Plant Photosynthesis" PPT courseware

Description

"The Discovery of Plant Photosynthesis" PPT courseware

Part One: Class Preview

Read the first paragraph on page P78 of the textbook. answer:

The concept of photosynthesis:

The process in which green plants use light energy through chloroplasts to convert carbon dioxide and water into organic matter that stores energy and releases oxygen is called photosynthesis.

The discovery of photosynthesis in green plants

Activity 1: Van Helmont’s experiments in the 17th century

1. Can you describe the process of this experiment?

2. Calculate: What is the increased mass of the willow tree? How much mass of soil is reduced?

3. What is the reason why willow trees gain weight?

4. What is the conclusion of this experiment?

Activity 2: Priestley’s experiments in the 18th century

Knowledge preparation: Candles need oxygen to burn and produce carbon dioxide; rats need oxygen to breathe and produce carbon dioxide.

Experiment 1 Plants produce oxygen and absorb carbon dioxide through photosynthesis.

Experiment 2 Under light, plants cannot survive without a burning candle in a sealed bell jar. Plants need carbon dioxide to make oxygen.

Experiment 3: Combustion and respiration use up oxygen and release carbon dioxide.

PPT on the discovery of plant photosynthesis, part 2: Think about it

If you were Priestley, what conclusion would you have reached at that time?

Priestley's conclusion:

Plants can "purify" the air that has become polluted by burning or animal breathing, making the air better.

Plants absorb carbon dioxide and produce oxygen;

Plants use carbon dioxide to make oxygen;

Plant photosynthesis absorbs carbon dioxide and produces oxygen;

Carbon dioxide and sunlight are factors that affect plant growth.

Discovery of Plant Photosynthesis PPT, Part 3: Photosynthesis

Subject: green plants

Location: chloroplast

Energy: light energy

Raw materials: carbon dioxide, water

Products: organic matter (energy stored), oxygen

The significance of the discovery of photosynthesis:

Promote changes in agricultural production methods

Promote the progress of human society

PPT on the discovery of plant photosynthesis, part 4: test you

1. Helmont was inspired by willow cultivation experiments. The main substances needed for the growth of green plants are: ( )

A.Carbon dioxide B.Water C.Inorganic salts D.Oxygen

2. Priestley’s experiment tells us that green plants need to absorb ( ) and release ( ) at the same time to grow.

A.Carbon dioxide B.Water C.Inorganic salts D.Oxygen

3. Which of the following factors is not necessary for plant growth: ( )

A.Carbon dioxide B.Water C.Soil D.Sunlight

Homework

1. Complete [Thinking and Practice] on P41~42 of the exercise book.

2. Select [Expand and Improve] on P41~42 of the exercise book.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, discovery of plant photosynthesis PPT download, .PPT format;

For more information about the PPT courseware "Photosynthesis and Respiration of Green Plants and the Discovery of Plant Photosynthesis", please click the "Photosynthesis and Respiration of Green Plants ppt Discovery of Plant Photosynthesis" ppt tag.

"The Discovery of Plant Photosynthesis" PPT:

"The Discovery of Plant Photosynthesis" PPT Part One: Photosynthesis The process in which green plants use light energy to convert carbon dioxide and water into organic matter that stores energy and releases oxygen through chloroplasts is called photosynthesis. Raw materials: carbon dioxide (C..

File Info

Update Time: 2024-09-06

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 1 industry PPT template

Preview