WHAT is the scientific name of vitamin ??

 Scientific Name of vitamin 

Vitamin A                (Fat-soluble)	Retinol
Vitamin B1      (Water-soluble)	Thiamine
Vitamin B2               (Water-soluble)	Riboflavin
Vitamin B3             (Water-soluble)	Niacin
Vitamin B5            (Water-soluble)	Pantothenic Acid
Vitamin B6          (Water-soluble)	Pyridoxine
Vitamin B7           (Water-soluble)	Biotin
Vitamin B9 (Water-soluble)	Folic Acid
Vitamin B12         (Water-soluble)	Cobalamin
Vitamin C (Water-soluble)	Ascorbic acid
Vitamin D (Fat-soluble)	Calciferol
Vitamin E (Fat-soluble)	Tocopherol
Vitamin K (Fat-soluble)	Phytonadione

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Do the avian species have sizable penis ?

 

   Do the avian species have sizable penis ?

Out of avian species only duck and ostries have the sizable penis of their male . male bird of other poultry species do not have sizable penis however they have copulatory orgag which is called papillae .

                               pic:  male oestries genitle part

Most male birds, including chicken and quail, have no penises, but ducks and geese have coiled penises that can measure up to 9 inches in length. These retract when not in use.

                               pic:male genitale part of duck

How excretion occur in shelled eggs?

 

 How excretion occur in shelled eggs?

Excretory products are stored within the shell in special packings.e.gBirds ( egg laying) excrete their nitrogenous wastes as uric acid in the form of a paste.This process is metabolically more expensive but it allows more efficient water retention, therefore embryos store uric acid more easily in the egg.

The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extra-embryonic tissues).

This sac-like structure is primarily involved in nutrition and excretion, and is webbed with blood vessels for gaseous exchange.

 

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