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Internal Factor - Factors Controlling Metamorphosis in Insects
Likewise to the amphibian metamorphosis, moulting and metamorphosis in insects has been found to be initiated internally via hormones. Hormonal control involves at least three organs of endocrine secretions. They are
(1) Prothoracic gland
(2) Corpora allata
(3) Brain (protocerebrum)
Figure depicts the endocrine glands associated with the brain in moths that is protocerebrum and corpora allata.
Figure: The endocrine glands associated with the brain in meal moths. a) Dorsal view of the brain in a meals moth pupa, b) Transverse section of the protocerebrum in a caterpillar of the meal moth
Ribosomes - It is also known as Protein factory, Engine of the cell. Ribosomes are smallest cell organelles (150 x 250 Å). Unit membrane less cell organelle. Ribo
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What is a burette and how is it used? A burette is a uniform-bore glass tube with fine gradations and a stopcock at the bottom, used particularly in laboratory procedures for a
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Define Amino Acids in the Building Blocks of Proteins? Amino acids, as you have already illustrated, have a carboxyl group and an amino group bonded to a common carbon atom and
In the previous section we discussed the concept of species in detail and concluded that the concept of biological species and Mayr's definition of species have a wide acceptance a
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