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

Description

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

learning target:

What conditions are needed for green plants to produce organic matter?

What are the main organic substances produced?

1. Experiment

Purpose requirements

Test whether the organic matter produced by green leaves under light is starch

Explore whether light is an indispensable condition for green plants to produce organic matter

Materials and tools:

Potted geranium, black paper, transparent tape, alcohol, iodine solution, large beaker, small beaker, petri dish, tripod, asbestos mesh, tweezers, dropper, matches, clean water

Discussion and Thoughts:

1. Based on the phenomena observed in the experiment, what is the experimental conclusion you draw?

1) The photosynthesis of green plants mainly produces starch

2) Light is an indispensable condition for photosynthesis

2. Flowers and plants grown at home will die if left in a dark place for a long time. Can you tell me why?

Answer: Because light is the condition for green plants to produce organic matter. If the plant does not receive light for a long time, it will not be able to synthesize the organic matter necessary for its own life activities. Therefore, domestic flowers and plants will die if they are placed in the dark for a long time.

2. Photosynthesis

Concept: Green plants use the energy provided by light to synthesize organic matter such as starch in the chloroplast, and convert the light energy into chemical energy and store it in the organic matter.

significance:

① The organic matter produced by photosynthesis meets the needs of its own growth, development, and reproduction.

② Provide the basic food source for other organisms in the biosphere.

Photosynthesis:

Photosynthesis refers to the process in which green plants use light energy through chloroplasts to convert carbon dioxide and water into organic matter that stores energy and release oxygen.

Class exercises:

1. In the experiment of "exploring the relationship between sunlight and organic matter" using vegetables, the correct order of experiments is ＿＿＿

(1) Add iodine solution dropwise to the leaves

(2) Shade part of the leaves

(3) Rinse with clean water

(4) Observe color reaction

(5) Decolorize with alcohol

(6) Dark treatment for one day and night

2. In the above experiment ( ).

A. There is no control experiment. B. The unshaded part of the leaves is a control experiment.

C. No control experiment is required. D. The light-blocking part of the leaves is a control experiment.

small test

1. Quick answer questions

1. The "natural factory" that produces organic matter in the biosphere is ( )

A. Algae B. Bryophytes C. Seed plants D. All green plants

2. After part of the geranium leaves were shaded and dyed with iodine solution, the unshielded parts turned blue, indicating that photosynthesis occurred ( )

A. Sugar B. Protein C. Starch D. Fat

3. Which statement about using alcohol to heat water is incorrect ( )

A. Let the chlorophyll dissolve into the alcohol for decolorization.

B. Kill the cells of the leaves to facilitate the entry of iodine into the cells.

C. Let the alcohol prompt the leaves to produce more precipitation, making the experimental phenomenon more obvious.

D. Prevent alcohol from burning due to heat and causing danger

4. From "Wolves eat sheep and sheep eat grass" we can see that the energy in the wolf's body ultimately comes from ( )

A. Wolf B. Sheep C. Grass D. Light energy

Reference answer

Why cover part of the leaves with black paper?

It was for a controlled experiment. See if both the parts exposed to light and the parts not exposed to light can produce starch.

Why soak leaves in alcohol instead of water? Why water-proof heating?

Answer: This step is to dissolve the chlorophyll in the leaves in alcohol to decolorize, making it easier to identify the color change of starch;

Because the alcohol evaporates too quickly, the temperature is too high, causing waste, and the effect of dissolving chlorophyll is not very good, it is especially dangerous to ignite the alcohol.

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Update Time: 2024-10-14

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

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