Oxygen has not always been present on earth. The earth itself is estimated to be around 4.6 billion years old, but believe that oxygen first appeared about 2.7 billion years ago, when microscopic cyanobacteria, otherwise known as blue-green algae, developed the ability to photosynthesize sunlight into sugars and oxygen. It took roughly a billion more years for enough oxygen to collect in the atmosphere to support early forms of terrestrial life.
Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch and stored. Oxygen is produced as a by-product.
This process is called photosynthesis. Temperature, carbon dioxide concentration and light intensity are factors that can limit the rate of photosynthesis.
Effect of different colors of light on the rate of photosynthesisThe effect of different lights on plant growth: incandescent light, fluorescent light, sunlight and black light.
I will measure the rate of photosynthesis by counting the number of bubbles that are released by the stem of the pond-weed when the lamp is shone on it from different distances.
Background information: Photosynthesis Photosynthesis is the process of autotrophs turning carbon dioxide and water into carbohydrates and oxygen, using light energy from sunlight.
Roughly 80 percent of the earth's total photosynthesis is produced in the ocean. It's estimated that 50 to 80 percent of the world's oxygen is generated by ocean plant-life, but the critical remaining portion is generated by terrestrial plant life, particular the earth's forests So the pressure is constantly on the terrestrial plant world to keep up the pace. The loss of the world's forests has far-reaching consequences in terms of the compromising the percentage of oxygen in the earth's atmosphere. And because the process of photosynthesis consumes carbon dioxide, trees and other plant life, are a means by which the earth "scrubs" out carbon dioxide and replaces it with pure oxygen.
Plants absorb water through their roots, and carbon dioxide through their leaves. Some glucose is used for respiration, while some is converted into insoluble for storage. The stored starch can later be turned back into glucose and used in respiration. Oxygen is released as a by-product of photosynthesis.
For photosynthesis to occur, plants need: · Light energy from the sun · Chlorophyll to absorb light energy · Carbon dioxide from the atmosphere and from respiration in plant cells · Water which is absorbed by the roots and transported to the leaves by the xylem tubes....
Many processes occur in a tree leaf, but none more important than photosynthesis and the resulting food it manufactures and the oxygen it produces as a byproduct. Through the magic of green plants, the radiant energy of the sun is captured in a leaf's structure and made available to all living things. Except for a few kinds of bacteria, photosynthesis is the only process on earth by which organic compounds are constructed from inorganic substances, resulting in stored energy.
The Effect of the Type of Soil on the Amount of Chlorophyll in Bean PlantsThe Effects of Wavelengths of Light on Plant Food ProductionEffect of different colors of light on the growth of plants Do plants need sunlight to be green?
The effects of various pH levels on the photosynthesis process of the aquatic plant elodeaThe effects of phosphorous on the photosynthesis of aquatic plantsDoes light affect stem growth?
Follow in the steps of van Helmont, John Woodward, Joseph Priestley and Jan Ingenhousz and discover photosynthesisIs plant growth affected by exposure to ultraviolet light?