Describe the four main parts, or whorls, of a flower.
Short Answer
Expert verified
In general, a flower has four whorl components, namely the calyx, corolla, gynoecium and androecium.
Step by step solution
01
Introduction
Flower is the reproductive organ of an angiosperm. Angiosperms reproduce sexually with the help of flowers. Flowers also help in attracting pollinators for pollination by producing nectar as a reward for the pollinators. A flower in general has four whorl components: calyx, corolla, gynoecium and androecium.
02
Explanation
The calyx and corolla are the non-reproductive parts of the flower. They are called the accessory parts of the flower, that performs different functions.
The flower's outer whorl is called the calyx. It is made up of sepals, which are tiny leaves located at the base of flowers. Calyx provides protection to the flower while it is in bud stage and they perform photosynthesis as well.
The second whorl of the flower is called corolla, that is made up of petals. Petals are vividly coloured and scented to attract pollinators.
03
Explanation
The gynoecium(carpel) and androecium(stamen) are reproductive parts of the flowers that is involved in the reproduction process.
The carpel is the flower's fourth whorl, and it is found in the centre. The carpels house the pistil, the female reproductive component of the flower. It includes the ovary, style, and stigma. The egg, or ovule, is found in the ovary. After fertilisation the ovary becomes the fruit and the ovules become the seed, which are guarded and enclosed by the fruit. The stigma is supported at the tip of the ovary by a vertical structure called the style. Pollen that has been dispersed, sticks to the stigma and travels down the style to the ovary.
The male reproductive part of the flower is the stamen, and makes up the third whorl of the flower. It consists of an anther and a slender stalk supporting the anther, called filament. Pollen grains, which contain the male gametes are produced and stored in the anther.
Most researchers use random assignment, which is where subjects are put into groups using a random method. Flipping a coin to see if a subject will be in the control group or the treatment group is an example of a random assignment.
There have been many studies recently concerning coffee drinking and cholesterol level. While it is known that several coffee-bean components can elevate blood cholesterol level, it is thought that a new type of paper coffee filter may reduce the presence of some of these components.
The main idea is the central, or most important, idea in a paragraph or passage. It states the purpose and sets the direction of the paragraph or passage. The main idea may be stated or it may be implied.
In experimental research, random assignment is a way of placing participants from your sample into different groups using randomization. With this method, every member of the sample has a known or equal chance of being placed in a control group or an experimental group.
This means that each individual has an equal chance of being assigned to either group. Usually in studies that involve random assignment, participants will receive a new treatment or program, will receive nothing at all or will receive an existing treatment.
Random assignment is however a process of randomly assigning subjects to experimental or control groups. This is a standard practice in true experimental research to ensure that treatment groups are similar (equivalent) to each other and to the control group, prior to treatment administration.
Food is the most obvious cause of unhealthy cholesterol levels. Your liver makes most of your body's cholesterol. But much of the cholesterol that you do get from your diet comes from foods that are high in saturated fats, such as: Red meat.
Some people call HDL “good” cholesterol. This is because it helps remove cholesterol from the body. While coffee does not contain cholesterol, it can affect cholesterol levels. The diterpenes in coffee suppress the body's production of substances involved in cholesterol breakdown, causing cholesterol to increase.
For example, a 2005 study found that drinking one cup of coffee within an hour of a cholesterol test does not significantly impact the clinical test results. Specifically, black coffee did not significantly affect TC/HDL-C levels, and coffee with sugar and creamer did not significantly alter triglyceride levels.
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