Human Hormones

    The pituitary gland is an endocrine [ductless] gland. The hormones of the pituitary gland stimulate testes and ovaries to produce their hormones. It also stimulates the thyroid and adrenals to secrete their hormones. The pituitary gland produces the growth hormone necessary for the normal growth of a person.

Other endocrine glands are the thyroid [secretes thyroxin controls metabolism of carbohydrates, proteins, and fats lack of which causes goiter]; pancreas [produce insulin lack of which causes diabetes] and adrenals [produce adrenalin which helps adjust to stress].

Plant Hormones

Auxins: These are indole compounds. Helps the cells grow longer, rooting stems, promotes flowering, prevents early dropping of fruits and leaves, and enhances the dropping of old leaves. It is also used as a weed killer of dicots.

Gibberellins: help in the growth of stems, and elongation of fruits. All are acidic.

Cytokinins: Promote cell division.

Ethylene: Hasten’s ripening of fruits by increasing their respiration rate.

Abscisic acid: inhibits growth, and leads to wilting of leaves.

Miscellaneous

Thyroxin causes the morphosis of tadpoles into frogs. Thyroxin needs iodine, so if the water in which tadpoles swims don’t have iodine. The tadpoles can’t become frogs.

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