bio生物教學影片

Reproduction in Plants

Reproduction in Plants Plants are amazing organisms that reproduce in fascinating ways. Reproduction in plants can be classified as sexual or asexual, depending on whether or not it involves the fusion of gametes. Let’s take a closer look. Sexual Reproduction Sexual reproduction in plants involves the fusion of gametes from two different individuals. This can occur within the same plant or between different plants. Pollination The first step in sexual reproduction in plants is pollination. Pollination is the process by which pollen is transferred from the anther of a flower to the stigma of another flower or a receptive part of the same flower. This can occur through self-pollination, when the pollen is transferred to the same flower, or through cross-pollination, when the pollen is transferred to a different flower on a different plant. Fertilization Once pollination occurs, the pollen grain germinates and produces a long tube called the pollen tube, which grows down through the style towards the ovary. The nucleus of the male gamete then travels down the pollen tube and fuses with the female gamete in the ovule, resulting in fertilization. Asexual Reproduction Asexual reproduction in plants does not involve the fusion of gametes. Instead, a new plant is produced from vegetative structures such as leaves, stems, or roots. Runners One common form of asexual reproduction in plants is through runners. Runners are modified stems that grow horizontally along the ground and produce new plantlets at nodes along their length. Rhizomes Another form of asexual reproduction is through rhizomes. Rhizomes are specialized stems that grow underground and produce new shoots and roots at intervals along their length. Bulbs Bulbs are another form of asexual reproduction in which a new plant grows from an underground bud that develops at the base of the parent plant. In conclusion, plants have a variety of ways to reproduce, from the fascinating process of sexual reproduction involving pollination and fertilization, to the numerous forms of asexual reproduction

 

植物繁殖 植物是神奇的生物,它们以迷人的方式繁殖。植物的繁殖可分为有性繁殖或无性繁殖,这取决于它是否涉及配子融合。让我们仔细看看。

 

有性生殖 植物的有性繁殖涉及来自两个不同个体的配子的融合。这可能发生在同一工厂内或不同工厂之间。 授粉 植物有性繁殖的第一步是授粉。授粉是花粉从一朵花的花药转移到另一朵花的柱头或同一朵花的接受部分的过程。这可以通过自花授粉发生,当花粉转移到同一朵花上时,或者通过异花授粉发生,当花粉转移到不同植物上的不同花上时。 施肥 一旦授粉发生,花粉粒就会发芽并产生一个称为花粉管的长管,它通过花柱向下生长到子房。雄配子的核然后沿着花粉管向下移动并与胚珠中的雌配子融合,导致受精。 无性繁殖 植物的无性繁殖不涉及配子的融合。取而代之的是,一种新植物是由叶、茎或根等营养结构产生的。 跑步者 植物无性繁殖的一种常见形式是通过跑步者。跑步者是沿地面水平生长的改良茎,并在沿其长度的节点处产生新的小植株。 根状茎 另一种无性繁殖形式是通过根茎。根茎是特殊的茎,生长在地下并沿其长度间隔地产生新的枝条和根。 灯泡 球茎是另一种形式的无性繁殖,其中新植物从在亲本植物基部发育的地下芽中生长出来。 总之,植物有多种繁殖方式,从涉及授粉和受精的有性繁殖的迷人过程,到无性繁殖的多种形式 植物繁殖 植物是神奇的生物,它們以迷人的方式繁殖。植物的繁殖可分為有性繁殖或無性繁殖,這取決於它是否涉及配子融合。讓我們仔細看看。 有性生殖 植物的有性繁殖涉及來自兩個不同個體的配子的融合。這可能發生在同一工廠內或不同工廠之間。 授粉 植物有性繁殖的第一步是授粉。授粉是花粉從一朵花的花藥轉移到另一朵花的柱頭或同一朵花的接受部分的過程。這可以通過自花授粉發生,當花粉轉移到同一朵花上時,或者通過異花授粉發生,當花粉轉移到不同植物上的不同花上時。 施肥 一旦授粉發生,花粉粒就會發芽並產生一個稱為花粉管的長管,它通過花柱向下生長到子房。雄配子的核然後沿著花粉管向下移動並與胚珠中的雌配子融合,導致受精。 無性繁殖 植物的無性繁殖不涉及配子的融合。取而代之的是,一種新植物是由葉、莖或根等營養結構產生的。 跑步者 植物無性繁殖的一種常見形式是通過跑步者。跑步者是沿地面水平生長的改良莖,並在沿其長度的節點處產生新的小植株。 根狀莖 另一種無性繁殖形式是通過根莖。根莖是特殊的莖,生長在地下並沿其長度間隔地產生新的枝條和根。 燈泡 球莖是另一種形式的無性繁殖,其中新植物從在親本植物基部發育的地下芽中生長出來。 總之,植物有多種繁殖方式,從涉及授粉和受精的有性繁殖的迷人過程,到無性繁殖的多種形式