现有甲、乙两种长势良好、状态相似的草本植物,已知甲是 C_4植物,不知乙光合作用固定 CO_2的类型。请设计实验鉴别植物乙是 C_3植物还是 C_4植物。现有如下几种方法。1 从植物形态结构方面鉴别(1)假设及分析:如果乙是 C_4植物,用显微镜观察该种植物叶片的横切面,则发现围绕着维管束的是呈“花环型”的两圈细胞,维管束鞘细胞中含有叶绿体。如果乙是 Existing A and B herbaceous plants with good growth and similar status are known to be C_4 plants. We do not know the type of fixed CO_2 in B photosynthesis. Please design the experiment to identify whether plant B is a C_3 plant or a C_4 plant. The following methods are available. 1 Identification from plant morphological structure (1) Hypothesis and analysis: If B is a C_4 plant, observe the cross-section of the leaf of the plant with a microscope, and find that the circumscribed bundle is a two-turn cell with a “garland type”. The bundle sheath cells contain chloroplasts. If B is