(2) Plant tissues mainly include meristem, protective tissue, vegetative tissue and conducting tissue. They are distributed in different parts, and each part has certain characteristics and functions. The epidermis of tomato has protective function, and this epidermis belongs to protective tissue.
(3) The order of making temporary slices of tomato pulp cells and onion epidermis cells should be consistent.
The experimental steps of making temporary slices of onion epidermal cells are summarized as follows: rubbing, dripping, tearing, spreading, covering, dyeing and sucking.
: "Wipe", wipe the glass slide and cover the glass with clean gauze;
"Drop": put the slide on the experimental platform and drop a drop of water in the center of the slide with a dropper;
Tearing: breaking the onion scales outward, and tearing a film from the inner surface of the onion scales with tweezers;
"Spreading": put the torn film into the water drop in the center of the slide, and gently spread the film in the water drop with a dissecting needle;
"Cover glass: use tweezers to pick up the cover glass, so that one end of the cover glass first contacts the liquid drops on the glass slide, and then slowly lays it flat to prevent bubbles;
To dye, drop iodine solution on one side of the cover glass.
Suction, the other side with absorbent paper, repeated 2 ~ 3 times, so that the dye solution soaked the whole specimen.
(4) The shutter and reflector can adjust the light intensity, and it is found that the external light is weak. At this time, if you want to see a bright field of vision, you should use a concave mirror with a large aperture and a reflector. Because the object seen from the eyepiece is an inverted image, the moving direction of the object image is opposite to that of the specimen. If you move the slide to the right, the object image will move to the left. Therefore, if you want to move the object image to the center of the field of vision, you must move the specimen to the place where the object image deviates. In this way, the object image can be moved to the center of the field of view. For example, if the object image is located at the lower left of the field of view, in order to move the object image to the middle of the field of view, the slide should be moved to the lower left, so that the object image will be moved to the upper right to move to the center of the field of view.
So the answer is: (1) seeds; Reproduction;
(2) protection;
(3) Qing; Cover glass; Bubble;
(4) concave; Lower left; fall down