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用熟透了的红色或黄色番茄,向果基部用刀稍切开一小口,以双手向左右撕成两半。在中轴的果肉上可以看到许多细沙状小突起,这些就是大的果肉细胞。用针尖或镊子轻轻的取下一小块果肉,放到扩大镜下观察,便可以看到一堆鸭蛋状透亮的细胞。倘使放在显微镜下观察,可以见到细胞内部的构造。细胞壁透明无色,里面充满了透亮无色的液体,这就是原生质,中间有一个球状的细胞核,还有10—20颗红色或黄色的质体,这就是使番茄变红或黄色的原因。再用小刀取一点果室里的果汁来观察,有许多被破坏的细胞和游离的细胞,其中含有许多贮藏的淀粉粒。怎样证明它是淀粉粒呢?用碘化钾1.5克与碘0.3克溶于100cc.的水中所配成的碘液来试验,它就变成蓝色。西瓜瓤的分离细胞亦可用同样方法观察。
Using a ripe red or yellow tomato, cut a small cut into the base of the fruit base and torn it in half with both hands. In the shaft of the pulp can see many fine sand-like protrusions, these are large pulp cells. With a tip or tweezers gently remove a small piece of fruit, put into the magnifying glass to observe, you can see a pile of duck-shaped translucent cells. If you look under the microscope, you can see the internal structure of the cell. The cell wall is transparent and colorless, filled with a translucent, colorless liquid. This is the protoplasm, with a globular nucleus in the middle and 10-20 red or yellow plastids, which is why the tomato turns red or yellow. Then use a knife to take a look at the fruit juice in the fruit chamber to observe, there are many damaged cells and free cells, which contains many stored starch grains. How to prove that it is starch granules? With 1.5 g of potassium iodide and 0.3 g of iodine dissolved in 100 cc of water dubbed iodine to test, it becomes blue. Watermelon Semen cells can also be observed using the same method.