Plants help us in a variety of ways. One of the most important ways is by producing oxygen. Some plants also serve as food for people and animals. There are many species of plants. Some are very large while others are quite small. Just because you can’t see a plant with your eye doesn’t mean it’s not there. Somehow even tiny plants can help us in big ways. Light is very important for warmth and oxygen. Colorimeters measure the amount of color in an object.
Plants can come in many different shapes and sizes. They grow all over the world. You can find a plant in almost any place at anytime. Plants that grow in just water are helpful too. Algae are a major group of water plants. Plants provide oxygen through a process called photosynthesis. Photosynthesis is when plants use chemicals to change chemical compounds into oxygen. Chlorophyll absorbs water and carbon dioxide. Sunlight provides energy for photosynthesis to be able to happen. In the process chemicals change carbon and water become carbohydrates. There is always twice as much hydrogen as there is oxygen. The amount of light needed in the process is called photoperiodism. Different amounts of light are needed when plants are producing oxygen. Plants can grow almost anywhere.
There are four main groups of algae. A major group is blue green algae. These algae have no nuclei and they have a gross taste and odor. Blue green algae are also a slimy growth in shallow areas. Brown algae can be large and small. One of the largest is
Over 200 feet while the smallest ones are microscopic. Brown algae live in salt water and are mainly considered seaweed. Another algae group is red algae. Red algae are smaller than brown algae. This species grow in the ocean. They are coral and coral reefs mostly.
The fourth group is green algae. Green algae are cells with definite nuclei. Chloroplasts are a part of the green algae species. They live in fresh water where it is cool, moist and light. A plant called spirogyra is a green algae species. Spirogyra is a spiraled chloroplast. Algae can be found almost anywhere.
Colorimeters are used to measure the light in an object. Absorption and emission happens when there are molecules that light has made. A Colorimeter measures the intensity of an object. Colorimeters measure how much color there is in an object.
Light is very important to everyone and everything everywhere. Without light there would be far less natural heat and there would be no difference in seasons. Light also helps green plants to make oxygen. Without light there would be no heat or air. Light bounces off an object into our eyes. Light is made up of atoms that absorb energy. They absorb energy from the sun. They can also absorb energy by bouncing off of other particles. When they absorb energy by colliding with other particles, they are called an excited atom. The stage when they are an excited atom is very brief. During this stage they do not emit, or give off light. Atoms can also be excited by heating them. Reflection occurs when light is reflected by a smooth surface. Light is very important to everyone.
Plants are important because they give off oxygen. There are many species of plants, one of which is algae. Colorimeters measure the amount of color in an object. Light is needed everywhere all the time.
Top of Page
C.J.H., "Photoperiodism," World Book Encyclopedia, 1947, p. 6308.
Fasset, Norman C, A Manual of Aquatic Plants, Madison 6, Wisconsin, McGraw-Hill, 1940
Fenton, Sharon, "Schools Online," http://www.shu.ac.uk/schools/sci/sol/cgi/answers/sf56.htm
G.I.BU., "Photosynthesis," World Book Encyclopedia, 1947, p. 6308
Lenny, "Hanna Instruments Ltd.," http://hannainst.co.uk/lenny.color.bg.html
L.H.T., "Algae" World Book Encyclopedia, 1947, p. 215.
Rhodes, Russell G., "Algae," World Book Encyclopedia, 1999, p. 349.
"Spirogyra," World Book Encyclopedia, 1947, p. 7654.
Walker,Jearl, "Light," World Book Encyclopedia, 1995, p. 282-292.
"Waterwatch Victoria-Manual," http://www.vic.waterwatch.org.au/manual/sect4d.htm
Whallon, Joanne, "Microbe Zoo," http://commtechlab.msu.edu/sites/dlc-me/zoo/