"The Essence of Plant Photosynthesis" PPT

Description

"The Essence of Plant Photosynthesis" PPT

Part One: Situation Import

Green plants are giant natural "factories" that produce organic matter. They can use carbon dioxide and water as raw materials under light conditions to produce huge amounts of organic matter and feed almost all living things on the earth. So, what are the main products of photosynthesis of green plants?

learning target

1. Explain that green plant cells can produce starch and release oxygen at the same time under light

2. Clarify that photosynthesis of green plants requires carbon dioxide and water

3. List the formulas for the basic process of photosynthesis in green plants

The essence of plant photosynthesis PPT, part 2: theme exploration

Explore theme one

Green leaves produce starch when exposed to light

Photosynthesis produces starch

Step 1: Place a pot of vigorously growing geraniums in a dark place for a day and night.

Purpose: to consume its own organic matter (such as starch).

Step 2: Cover part of the dark-treated geranium leaves from the upper and lower sides with pieces of black paper smaller than the leaves.

Step three: Place the geranium treated in step two under the sun for a period of time.

Tip: The parts not covered with black paper can photosynthesize in the light.

Step 4: Pick off the covered leaves, remove the black paper, and observe the color change of the leaves.

Explore theme two

photosynthesis produces oxygen

Purpose:

Explain that green leaves can produce oxygen when exposed to light.

equipment:

Glass funnel beaker (larger diameter than funnel)

test tube matches

Clear water hornwort (or black algae)

Methods and steps:

1. Put an appropriate amount of hornwort in a beaker filled with tap water, use a short-necked funnel to catch the hornwort in the water, and then buckle a test tube filled with clean water on the neck of the funnel.

2. Place the device under sunlight and observe the phenomenon after a period of time.

3. When the water in the test tube drops to lower than the liquid level in the beaker, remove and invert the test tube so that the mouth of the test tube faces upward.

4. Use a thin wooden strip with sparks to quickly insert into the test tube and observe what happens.

Explore theme three

Photosynthesis requires carbon dioxide

Purpose:

Give an example of how green leaves absorb carbon dioxide under light and use it to produce starch

equipment:

test tube glass funnel

Large beaker sodium bicarbonate solution

Tap water hornwort (or black algae)

Experimental guidance

1. Use recommended equipment to form two sets of experimental devices

2. Add sodium bicarbonate solution to beaker a

Add an equal amount of tap water to beaker B

3. Put the two sets of devices under the light

4. Observe the changes that occur in the funnel and test tube

The essence of plant photosynthesis PPT, the third part: training to meet standards

1. The organic matter produced by green leaves under light is ( )

A. Starch B. Protein C. Fat D. Inorganic salt

2. The indispensable condition for green plants to produce organic matter is ( )

A.Moisture B.Air C.Light D.Temperature

3. The place where photosynthesis takes place is ( )

A. Mitochondria B. Chloroplast C. Vacuole D. Cell wall

4. In the experiment "green leaves produce starch under light", the potted geranium was placed in a dark place for a day and night. The purpose was ( )

A. Convenient to check the amount of starch

B. Helps remove chlorophyll

C. Let the original starch in the leaves be exhausted

D. Convenient for testing with iodine solution

5. Use black paper to cover part of the leaf from the upper and lower sides, and then move it to the sun. The purpose of this experiment is ( )

A. Prevent gas exchange in the covered part

B. Covering can reduce transpiration

C. Compare the covered and uncovered parts

D. Control the release of oxygen from the covered part

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

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

"The Essence of Plant Photosynthesis" PPT courseware:

"The Essence of Plant Photosynthesis" PPT Courseware Part One: New Lesson Introduction As the saying goes: People are iron and rice is steel. If you don't eat one meal, you will be hungry. Green plants need certain nutrients every day. They can not only supply themselves with food, but also provide other living things on the earth.

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Update Time: 2024-11-17

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

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