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What should I do for the biological experiment operation exam?

2026-09-27 14:47
2026-09-27 15:20

The biological experiment operation exam had a variety of contents. The following were some common experimental operations: 1. ** Cell related experiments ** - ** Prepare and observe the onion scales and leaf inner skin cells. - The preparation work included filling in the school, name, exam number, materials and equipment. The equipment used included a microscope, gauze, iodination solution, a drip bottle filled with clean water, a single-sided blade, blotting paper, onion scale leaves, cover glasses, slide glasses, tweezers, waste gas buckets, rags, and so on. - The preparation process was to wipe (wipe the glass slide and cover glass with clean gauze), drip (drip 1 - 2 drops of water in the center of the glass slide), take (use a blade to draw a small square on the inner surface of the onion scale leaf and then tear a small piece with tweezers), spread (soak the torn inner surface into the water drop and flatten it with tweezers), cover (use tweezers to clamp the cover glass while touching the water drop first and then slowly put it down), dye (drip the solution of iodination on one side of the cover glass, and use blotting paper to absorb the solution of iodination on the other side to soak the entire specimen). - When observing, you have to take the mirror and place it (Hold the mirror wall with one hand, hold the mirror stand with the other, place it about 7 cm away from the edge of the experiment table and install the eyepieces and objective lens), light (Raise the lens barrel, turn the shifter so that the low-power objective lens is aimed at the light hole, maintain a distance of about 2 cm, aim the large aperture at the light hole, and see a bright circular field of view by turning the mirror), observe (Place the specimen slide on the stage and press it with a pressing plate, facing the center of the light hole. Turn the coarse focus screw to lower the lens to the specimen slide. Look at the objective lens from the side. Then turn the coarse focus screw to raise the lens to look for the object and adjust it to the center of the field of view). Finally, arrange the equipment.(Take off the glass slide, rinse it, wipe it, and put it back in its original place. Turn the shifter to tilt the objective lens to the sides, lower the lens to the lowest point, turn the mirror to place it vertically, wipe the objective lens, reset the experimental equipment, dispose of the onion scales, leaves, blotting paper, and other wastes, and fill in the experimental report.) - ** Observation of permanent smear of human blood **: It mainly uses a microscope and a permanent smear of human blood for observation. - ** Observing the mitotic slices of plant cells **: Through microscopic observation of slices, one can understand the related structure of mitosis of plant cells. 2. ** Seed-related experiments ** - ** Observe the structure of the seed **: - For the soaked kidney bean (soybean, broad bean, etc.) seeds and corn seeds, equipment such as magnifying glasses, blades, dissecting needles, dropper, petri dishes, and diluted iodination solution would be used. - The experiment process included observing the external shape and identifying the structure, such as cutting the corn seed vertically from the center. - ** Investigate whether light is the external condition for seed sprouting **: You need to set different lighting conditions to explore the relationship between seed sprouting and light. 3. ** Other experiments ** - ** Observing the structure of the leaf's abyssal skin **: Use a microscope, glass slide, cover glass, gauze, tweezers, dropper, blotting paper, blade, and other equipment, as well as fresh spinach or broad bean leaves, and other materials. Use clear water to carry out the experimental operation to observe the structure of the leaf's abyssal skin. - ** Observe the permanent section of the leaf cross-section **: Observe the permanent section of the leaf cross-section with the help of a microscope. - [Confirm that food contains energy: Use the assembled iron frame and its auxiliary structures, test tubes, thermometer, dissecting needle, alcohol lamp, match, peanut seeds, water, and other materials to carry out the experiment.] Read more exciting novels for free

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