A : Are flowers useful to us in many ways?
B :Yes I think so.
A : Flowers also have different shapes, sizes , and colours. Each flower is attached to the stem by a flower stalk.
B : And in some plants, the flowers grow singly while in others the flowers many grow together in a bunch. Do you agree?
A : Yes, I do. Well, most flowers have four parts : petals, sepals, male parts and female parts.
B : Different plants have petals of different colours, you know. They attract insects and birds.
A : Well, below the petals, on the outside of the flower, are the sepals. They usually look like small leaves. And they protect the flower bud.
B : Flowers with both male and female parts are called bisexual flowers.
A:But some flowers have stamens only. These flowers are called male flowers. Some only have the pistil and so they are called the female flowers.
B:Well,I know that. The papaya,pumpkin,cucumber and watermelon are examples of plants where the male and female parts are on separate flowers.
A:Perfectly right.
A:花在许多方面对我们都很有用吗?
B:是的,我想是这样的。
A:花也有不同的形状、大小和颜色。每种花都是由花柄连接在茎上的。
B:还有,有些植物的花是单独长的,而有些则成束地生长在一起的,你同意这一点吗?
A:同意。大多数花都有4个部分:花瓣、萼片、雄蕊和雌蕊。
B:不同的植物的有不同颜色的花瓣。它们吸引昆虫和鸟类。
A:花瓣下边,在花的外部,长着萼片。萼片长得像小叶子,它们能起到保护花蕾的作用。
B:雄蕊和雌蕊在同一植株上的花叫做雌雄同株。
A:但是,有些花只有雄蕊。这些花叫做雄花。有些花仅有雌蕊,叫做雌花。
B:这个我是知道的。木瓜、南瓜、黄瓜和西瓜是雌雄异株植物。
A:很正确。