adaptation of organisms to light
Post on 19-Jan-2017
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Adaptation of organisms to
light
LightIn physics, Electromagnetic radiation that is visible, perceivable by the normal human eye as colors between red and violet.
The sensation of perceiving light; brightness.
What is Light adaptation?
In ocular physiology, adaptation is the ability of the eye to adjust to various levels of darkness and light.
Light in Human
Sunlight tans skin, stimulates the formation of vitamin D and sets biological rhythms. Light is also used in the treatment of disease.
…but excessive heat from the sun can burn our skin.
Our skin gets red and become painful, this condition is called sunburn. Continuous overexposure to sunlight may even lead to skin cancer.
Light in Aquatic organismsFish just like humans need a period of light and darkness. Fish have circadian rhythms like us that help them regulate body functions and metabolism.They definitely need a few hours of light per day.
Light helps the fish move freely in water.
but some fish produce their own lights, they’re called Bioluminescence
Light in PlantsAll plants use sunlight to make food (sugars) in a process called photosynthesis. They store the food in their leaves and the energy flows to other animals that eat the leaves. When leaves fall, decomposers in the soil, work on it, with the help of moisture and heat from the sun.
Without light, a plant would not be able to produce the energy it needs to grow.
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