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> 如图所示对果树进行环割树皮的实验,请据图回答.(提示:果树的韧皮部位于树皮内)(1)在A、B处环割后,该枝条的蒸腾作用并没有受到影响,原因是:______.(2)该枝条环割后,果实甲-生物
如图所示对果树进行环割树皮的实验,请据图回答.(提示:果树的韧皮部位于树皮内)(1)在A、B处环割后,该枝条的蒸腾作用并没有受到影响,原因是:______.(2)该枝条环割后,果实甲-生物
题目简介
如图所示对果树进行环割树皮的实验,请据图回答.(提示:果树的韧皮部位于树皮内)(1)在A、B处环割后,该枝条的蒸腾作用并没有受到影响,原因是:______.(2)该枝条环割后,果实甲-生物
题目详情
如图所示对果树进行环割树皮的实验,请据图回答.(提示:果树的韧皮部位于树皮内)
(1)在A、B处环割后,该枝条的蒸腾作用并没有受到影响,原因是:______.
(2)该枝条环割后,果实甲和乙的生长情况有何不同:______.
(3)如果在果树主干C处进行环割(如圆图中所示),果树的生长状况是______,原因:______.
题型:解答题
难度:偏易
来源:不详
答案
导管是由一种死亡了的,只有细胞壁的细胞构成的,而且上下两个细胞是贯通的.它位于维管束的木质部内,它的功能是把从根部吸收的水和无机盐输送到全身各器官,运输方向自下而上.
筛管是植物韧皮部(树皮内侧)内输导有机养料的管道.由许多管状活细胞上下连接而成.相邻两细胞的横壁上有许多小孔,称为“筛孔”.两细胞的原生质体通过筛孔彼此相通.筛管没有细胞核,但筛管是活细胞.筛管的功能是把叶片进行光合作用制造的有机物通过筛管自上而下运输到其它器官如果实、根等.
(1)在A、B处环割后,割断的是筛管;环割树皮没有伤到木质部,水分是仍然能通过木质部(木质部中的导管)运输的.因此该枝条的蒸腾作用并没有受到影响.
(2)该枝条环割后,虽然有机物的运输通道筛管被割断,但是甲果实仍然能得到上面的叶制造的有机物,因此甲果实发育良好;而叶制造的有机物不能运输到乙果实,因此乙果实停止发育.
(3)如果在果树主干C处进行环割,有机物的运输通道筛管被完全割断,叶制造的有机物不能运输到根,根不能进行呼吸获得能量,时间长了就会死亡.根得不到有机物被饿死,最终导致树木死亡.
故答案为:
(1)环割树皮没有伤到木质部,水分是仍能通过木质部中的导管运输的;
(2)甲发育良好、乙停止发育;
(3)果树会慢慢死亡;根部得不到有机物,无法进行呼吸作用而死掉.
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题目简介
如图所示对果树进行环割树皮的实验,请据图回答.(提示:果树的韧皮部位于树皮内)(1)在A、B处环割后,该枝条的蒸腾作用并没有受到影响,原因是:______.(2)该枝条环割后,果实甲-生物
题目详情
(1)在A、B处环割后,该枝条的蒸腾作用并没有受到影响,原因是:______.
(2)该枝条环割后,果实甲和乙的生长情况有何不同:______.
(3)如果在果树主干C处进行环割(如圆图中所示),果树的生长状况是______,原因:______.
答案
筛管是植物韧皮部(树皮内侧)内输导有机养料的管道.由许多管状活细胞上下连接而成.相邻两细胞的横壁上有许多小孔,称为“筛孔”.两细胞的原生质体通过筛孔彼此相通.筛管没有细胞核,但筛管是活细胞.筛管的功能是把叶片进行光合作用制造的有机物通过筛管自上而下运输到其它器官如果实、根等.
(1)在A、B处环割后,割断的是筛管;环割树皮没有伤到木质部,水分是仍然能通过木质部(木质部中的导管)运输的.因此该枝条的蒸腾作用并没有受到影响.
(2)该枝条环割后,虽然有机物的运输通道筛管被割断,但是甲果实仍然能得到上面的叶制造的有机物,因此甲果实发育良好;而叶制造的有机物不能运输到乙果实,因此乙果实停止发育.
(3)如果在果树主干C处进行环割,有机物的运输通道筛管被完全割断,叶制造的有机物不能运输到根,根不能进行呼吸获得能量,时间长了就会死亡.根得不到有机物被饿死,最终导致树木死亡.
故答案为:
(1)环割树皮没有伤到木质部,水分是仍能通过木质部中的导管运输的;
(2)甲发育良好、乙停止发育;
(3)果树会慢慢死亡;根部得不到有机物,无法进行呼吸作用而死掉.