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初中植物学第三章第三节讲到外界条件对根吸收水分的影响,除与土壤溶液的浓度大小有关外,还与土壤的温度有关。在低温下,根毛细胞的细胞质粘性增加,水分不易通过细胞质而达到液泡,这样就会使吸收的水分量大大减少。因此,在炎热的夏天,不宜在中午用井水浇花。在低温下细胞质的粘性增加是个看不见、摸不着的抽象概念,怎么让
The third chapter of the third chapter of junior high school botany talks about the influence of external conditions on the water absorption of roots. It is related to the temperature of the soil in addition to the concentration of the soil solution. At low temperatures, the cytoplasmic viscosity of the root hair cells increases, and water does not easily reach the vacuole through the cytoplasm, which will greatly reduce the amount of water absorbed. Therefore, in the hot summer, watering with well water should not be used at noon. The increased viscosity of cytoplasm at low temperature is an invisible, intangible abstract concept.