【题目】Paragraph 1: Pollen, a powdery substance,which is produce d by flowering plants an d con tains male reproductive cells, is usually carrie d from plant to plant by insects or birds, but some plants rely on the win d to carry their p ollen. Win d pollination is often seen as...
Most plants reproduce by making seeds, which sprout(发芽) and grow into new plants. To produce seeds, plants must be fertilised by pollen(花粉).usually from another plant of the same species. Many plants rely on insects, such as bees and butterflies, to spread pollen. Seeds are mostly ...
DIf both assertion and reason are false. Submit Flowers are the reproductive organs of plants. Pollination occurs when pollens are transferred within a flower or from one flower to another. Pollination is the transfer of pollens from View Solution ...
In what types of plants is pollen found? What were the first three genera of plants? What is the two major types of root system in plants? List the four major groups of plants that have evolved. What are the main forms of reproduction in plants?
Elevated CO2 levels, a hallmark of global climate change, have been shown to increase ragweed pollen production, but their effects on pollen allergenicity remain to be elucidated.Rauer, DeniseGilles, StefanieWimmer, MariaFrank, UlrikeMueller, ConstanzeMusiol, StephanieVafadari, BehnamAglas, Lorenz...
根据空前“Bees, flies, animals and wind spread pollen(花粉)from one plant to another. To ensure the seeds will grow into plants, give them space.(蜜蜂、苍蝇、动物和风将花粉从一种植物传播到另一种植物上。为了确保种子能长成植物,应该给它们一定的空间)”可知,空前提出了花园里异花授粉的方式,有蜜蜂...
Feminized seeds are designed to produce only female cannabis plants, which are the ones that generate the potent buds most growers want. These seeds are created by manipulating female plants to produce pollen, which then fertilizes other female plants to create seeds that carry only female genetics...
C. Plants in the tropics generally produce more pollen than those in temperate zones. D. The highest levels of pollen production are found in plants that depend on insects or birds to carry their pollen. 你的答案: 正确答案:A 题目解析: 登录 后才能查看题目解析,还没有账号? 马上注册 推荐文...
Which type of cell division takes place in the plants to produce pollen grains? Select the correct answer. Which of these is unique to flowering plants? A) double fertilization B) an embryo surrounded by nutritive tissue C) haploid gametophytes D) pollen production ...
aPollen,which is visible on the anthers of flowers,consists of tiny yellow grains of powder that make it impossible for the flowers to produce seeds. 花粉,是可看见的在花花药,包括使它不可能为了花能生产种子粉末的微小的黄色五谷。[translate]...