The first year of biology is a small production, how to do it, the first year of biology

The simplest: transpiration of plants.

Put a plastic bag around the base of a plant's stem (note that it must be the base of the stem), place it in the dark, and just wait. After a while, you will notice that there are small water droplets in the plastic bag. These are the water droplets formed by the water vapor emitted by the transpiration of the plant.

Make a model of the lung.

What tracheobronchi.

Balloons for the lungs. There is also the diaphragm

I did this and won the first prize in Dongcheng

Pressed specimens:

1. It is best to have complete plant organs: rhizomes, leaves, flowers and fruits.

2. Clamp with 6 to 8 layers of newspaper and press with a heavy object.

3. You can also use an electric iron, and the plants should be covered with a layer of cloth.

4. After pressing, put it into an artistic pattern.

5. Go to the photo studio to overmold.

2. Leaf vein specimens.

1. It is best to use large, soft leaves, such as white orchids.

2. Boil with laundry detergent water for 30 60 minutes (20 30 pieces) 3. Or put it in water and cook it in a pressure cooker.

4. After processing, wash off the mesophyll with water (assisted by toothbrush).

5. Dry, flatten, set up into a pattern, and the photo studio is plasticized.

3. Eggshell model.

1. Make a small hole with a needle at the top of the egg, suck out the contents with a syringe, and dry it 2. You can also open a hole, blow it out with a straw, and let it dry.

Fourth, the waste three-dimensional model.

Use a variety of items and tools to create biological models, such as cells, bacteriophages, lung respiration, muscles and joints, etc.

5. Plasticine model.

1. Use plasticine to make models of human systems, such as digestive system, respiratory system, urinary system, nervous system, etc.

2. Use different colors of plasticine to make different organs and pipes 3. Fix them in a cardboard box and cover them with transparent plastic film on top.

6. Insect specimens.

1. Fix it on the foam board with a pin, surround it with cardboard, and paste transparent plastic paper on the top 2. There should be many species of insects and the specimen should be complete.

It can be regarded as a small biological production, but the technology level is a little lower.

Biotechnology small production, the simplest is the "specimen", method: catch a butterfly or other insects, sandwich it in a thick book, flatten, remember to take it out and dry it during the day, and after drying, you can frame it, just like **.

And "Simple Biosphere".

Find a glass bottle, put a little sand in it, put a root of aquatic weed, and put a small fish on it, it's OK, it's easy.

Here's one you can check out.

(1) The action of the step makes the original starch in the leaf transport away and depleted

2) The action of alcohol in step dissolves the chlorophyll in the leaves

3) The purpose of shading treatment is to be a control

4) The unshaded part of the leaf turns blue because the green leaf photosynthesis produces starch, and the starch turns blue when exposed to iodine

5) The shading part of the leaf is yellowish-white, because of the lack of light, can not carry out photosynthesis, and does not produce starch.

6) The silver edge of the geranium leaves does not turn blue, indicating that the silver part does not contain chloroplasts. Chloroplasts are necessary for photosynthesis.

7) Cut the leaves into thin slices and put them under a microscope to see that the scattered blue structures in the cells are.

Chloroplast (8) This experiment proves that the product of photosynthesis is starch, and the conditions are light and chloroplasts

2] (1) Stomata (2) Carbon dioxide B (3) Oxygen chloroplast 7

Light energy, carbon dioxide + water——— organic matter (stored energy) + oxygen chloroplasts.

(1) Step You didn't shoot it, it should be left in the dark for a day and night, the purpose is to deplete the organic matter.

2) Dissolve the pigment.

3) Make it impossible for the occluded part to photosynthesize.

4) Blue undergoes photosynthesis to produce starch.

5) Brownish yellow (i.e., the color of iodine solution) No photosynthesis is undertaken, and (6) There are no chloroplasts here.

7) Fence organization.

8) Starch light chloroplasts.

6. RBC: red blood cell WBC: white blood cell HB:

Hemoglobin PLT: platelets.

11. High (blood pressure).

12. Capillary red blood cells.