A. stamen B. pistil C. sepal D. ovary 相关知识点: 试题来源: 解析 A。解析:本题考查花朵结构。雄蕊(stamen)是花朵中承载花粉的部分。雌蕊(pistil)是接受花粉的部分,萼片(sepal)主要起保护作用,子房(ovary)是雌蕊的一部分,主要与结果相关,所以B、C、D错误。反馈...
domatium- a part of a plant (e.g., a leaf) that has been modified to provide protection for insects or mites or fungi pycnidium- flask-shaped asexual structure containing conidia stipule- a small leafy outgrowth at the base of a leaf or its stalk; usually occurring in pairs and soon ...
The expression pattern of GRAM domain-containing pro- teins under various experimental settings, in particular those related to ABA, suggests that they may play func- tions in the perception of environmental signals and hormone signaling23. However, the potential relevance, if any, of GEM in ABA...
Pectin methyl esterases have no effect on the overall chain length, but they alter the solubility of the pectins and affect the rate at which they can be attacked by the chain-splitting pectinases. The latter cleave the pectic chain and release shorter chain portions containing one or a few...
Pollen Grain sperm are formed within this structure Angiosperms "vessel seeds"; seeds are held within the remains of the reproductive structure called the flower Fruit seed containing strcutre Two main classes of Angiosperms monocots and dicots Four main parts to the flower sepal, petal, stamen, ...
Fruit set is normally initiated by two fertilization events occurring in the ovules. Ovules are complex structures found in all seed bearing plants, comprising protective integuments that surround the megagametophyte leaving an opening referred to as the micropyle. When the pollen tube successfully ent...