Other cells make vinegar or lactic acid when they ferment sugar. In a different way, the fermentation process can continue and turn the alcohol into vinegar i.e. acetic acid.
When yeast ferments, it breaks down the glucose (CHO) into ethanol (CHCHOH) and carbon dioxide (CO).
Flower
A flower is the reproductive part of flowering plants. A flower is a special part of the plant. Flowers are also called the bloom or blossom of a plant. Flowers have petals. Inside the part of the flower that has petals are the parts which produce pollen and seeds.
In all plants, a flower is usually its most colourful part. We say the plant 'flowers', 'is flowering' or 'is in flower' when this colourful part begins to grow bigger and open out. There are many different kinds of flowers in different areas in the world. Even in the coldest places, for example the Arctic, flowers can grow during a few months.
Flowers may grow separately on the plant, or they may grow together in an inflorescence.
To investigate the structure of a flower, it must be dissected, and its structure summarised by a floral diagram or a floral formula. Then its family can be identified with the aid of a flora, which is a book designed to help you identify plants.
Flowers have four basic parts, from the outside in they are:
Although this arrangement is typical, plant species show a wide variation in floral structure. The modifications produced in the evolution of flowering plants are used by botanists to find relationships among plant species.
Flowers are an important evolutionary advance made by flowering plants. Some flowers are dependent upon the wind to move pollen between flowers of the same species. Their pollen grains are light-weight. Many others rely on insects or birds to move pollen. Theirs are heavier. The role of flowers is to produce seeds, which are contained in fruit. Fruits and seeds are a means of dispersal. Plants do not move, but wind, animals and birds spread the plants across the landscape.
Since the ovules are protected by carpels, it takes something special for fertilisation to happen. Angiosperms have pollen grains comprising just three cells. One cell is responsible for drilling down through the integuments, and creating a passage for the two sperm cells to flow down. The megagametophyte is a tiny haploid female plant which includes the egg. It has just seven cells. Of these, one is the egg cell; it fuses with a sperm cell, forming the zygote. Another cell joins with the other sperm, and dedicates itself to forming a nutrient-rich endosperm. The other cells take auxiliary roles. This process of "double fertilisation" is unique and common to all angiosperms.
Flowers are modified leaves possessed only by the flowering plants (angiosperms), which are relatively late to appear in the fossil record.
The earliest known fossils of flowers and flowering plants are from 130 million years ago, in the Lower Cretaceous.
The flowering plants have long been assumed to have evolved from within the gymnosperms; but the known gymnosperms form a clade which is distinct from the angiosperms. It has been concluded that the two clades diverged (split) some 300 million years ago.
Flowers have long been admired and used by humans. Most people think that flowers are beautiful. Many people also love flowers for their fragrances (scents). People enjoy seeing flowers growing in gardens. People also enjoy growing flowers in their backyards, outside their homes. People often wear flowers on their clothes or give flowers as a gift during special occasions, holidays, or rituals, such as the birth of a new baby (or a Christening), at weddings (marriages), at funerals (when a person dies). People often buy flowers from businesses called florists.
Some parents name their girl children after a flower. Some common flower names are: Rose, Lily, Daisy, Holly, Hyacinth, Jasmine, Blossom.
. The most expensive spice, saffron, comes from the crocus flower. Other flower spices are cloves and capers. Hops flowers are used to flavor beer. Dandelion can be made into wine.
Honey is flower nectar that has been collected and processed by bees. Honey is often named for the type of flower that the bees are using (for example, clover honey). Some people put flowers from nasturtiums, chrysanthemums, or carnations in their food. Flowers can also be made into tea. Dried flowers such as chrysanthemum, rose, and jasmine are used to make tea.
Flowers were used to signal meanings in the time when social meetings between men and women was difficult. Lilies made people think of life. Red roses made people think of love, beauty, and passion. In Britain, Australia and Canada, poppies are worn on special holidays as a mark of respect for those who served and died in wars. Daisies made people think of children and innocence.
1939
Square kilometre
A square kilometer (sometimes written "km²") is based on the SI unit of measurement of area, the "square meter". It is the area inside a square that has each side equal to 1 kilometer (1000 meters). This way of talking about area is often used to say how much land there is, on a farm or in a city, for example.
One square kilometer is just less than 0.39 square miles.
Judge
A judge is a person who is in control of a court of law.
The way to become a judge depends on each country. In some countries, judges must work with the law (often as a lawyer) for a number of years before they can "sit as a judge" in a courthouse. Judges are supposed to conduct the trial in an open courtroom and impartially.
Juries are used in many English speaking countries, but not for all cases. The modern jury trial first developed in mid-12th century England during the reign of Henry II. Today, the details differ between one country and another.
If there is a jury, the judge has the job of making sure the person taken to court is treated in a fair way. Some courts will have more than one judge. For important decisions about the laws of a country, countries may have a "supreme court" or "high court" with many (nine or more) judges in it. In the United States, judges on a supreme court are called "justices" and are led by a "Chief Justice".
In many countries, judges wear special clothes while being in court. Often this is a black robe or cloak. Supreme or High Court judges often wear a red cloak. Judges in some countries also wear a special long wig. They also used to put a piece of black material on their head when they sentenced a person to die.
Guilt (law)
In criminal law, a person is guilty if a court has decided they have done something illegal. If a person has broken a law by stealing, for example, they are guilty of a crime.
A person is guilty if a court says they are. The court has blamed them for doing something wrong. A guilty person is punished. The punishment is called the sentence.
Length
Length is a measurement. A ruler can measure length. The length of something is the distance between two ends of the thing. Short means a small length. Long means much length. Short and long are opposites. For two dimensional things, length is usually the longer side.
Length also describes time.
John sits down at one o'clock, or 1h. John waits until three o'clock, or 3h. John stands up at three o'clock, or 3h. John was sitting for 2 hours. The length of time John was sitting was two hours.
Weight
The weight of an object (or the weight of an amount of matter) is the measure of the intensity of the force imposed on this object by the local gravitational field. Weight should not be confused with the related but quite different concept of mass. For small objects on Earth, the weight force is directed towards the center of the planet. For larger objects, such as the Moon orbiting around the Earth, the force is directed towards the center of mass of the combined system.