Vitamin D and sunrays
State the association between vitamin D and sunrays?
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Vitamin D, or calciferol, gets synthesized within the skin through the action of ultraviolet range of sunrays upon the precursor molecules. Later it gets transformed into its active form in liver and in kidneys.
What is meant by the phellogen? Explain its function?
Write the basic difference between cell wall and plasma membrane?
Define the term primary mediators in brief?
How are animals classified according to their kind of digestive process?
From which germ layer do blood cells initiate? What are other organs as well as tissues made from that germ layer?
What do you mean by gonads? Explain the male and the female gonads in humans?
Why organisms live in the certain places?
Write down the constitution of cartilaginous matrix?
Specify the physical elements which have contributed to the great amount of the available energy over the primitive earth during the time of origin of life?
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