题目Your friend is allergic to pollen. What should you remind him? A. Play in the flower garden every day B. Wear a mask when going out C. Smell the flowers closely D. Touch the flowers often 相关知识点: 试题来源: 解析 B。解析:对花粉过敏出去的时候应该戴口罩,A选项每天在花园里玩、C...
The male gonad or the testis has a unique structure. This gonad has three main layers, namely: Tunica vaginalis. (outermost). Tunica albuginea (middle). Tunica vasculosa (innermost).Answer and Explanation: The gonads are parts of the reproductive system with the functions of secretions the ...
You need to have an awareness of the kind of trees you live near or the trees you plant that produces small-sized pollen. Certain trees can become a major allergy problem. It is your understanding of this, in combination with a knowledge of allergy-producing trees, that can help make the...
In botany, a fruit is the seed-bearing structure in flowering plants that is formed from the ovary after flowering. Fruits are the means by which flowering plants (also known as angiosperms) disseminate their seeds. Flower The reproductive structure of angiosperms, characteristically having either sp...
Which group produces pollen? A. ferns B. flowering plants C. mosses D. fungi Are Coniferophyta, Ginkgophyta, and Cycadophyta all gymnosperms? Which group of seedless plants has branching vascular tissue? What are some plants in a coniferous forest?
根据第二段和第三段Their study found that air pollution can influence(影响) pollinators(传花粉者) - insects like bees and butterflies.Pollinators are important.They spread pollen(花粉) among plants with flowers.This helps the flower produce(产出)seed and fruit.Without pollinator...
A stamen is part of the reproductive system of a flower. Stamens are usually referred to as the male parts of the flower, because they generate pollen which is used to fertilize the pistils, commonly known as the female parts, of other flowers. Once fertilized, thepistilwill develop a ...
Macairea radula (Melastomataceae) has two stamen sets, poricidal anthers, pollen as the main floral resource and flowers visited by vibrating bees, a set of traits related to heteranthery. However, tristyly, which also predicts stamens differences within the same flower, has been proposed as...
For example, one theory is that dinosaurs were allergic to flower pollen — flowering plants and bees evolved together during the late Cretaceous period. However, flowering plants existed for millions of years before the dinosaurs died out. Another theory is that mammals, which began to proliferate...
What is called the transfer of pollen grains from anther to the stigma in plants? Regarding flower anatomy, which is the correct statement from the following: 1. The ovary becomes the fruit. 2. The stigma becomes the seed. 3. The ovule produces the petals. 4. The carpel produces ...