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Plant and Animal Hormones | Science - Points to Remember | 10th Science : Chapter 16 : Plant and Animal Hormones

Chapter: 10th Science : Chapter 16 : Plant and Animal Hormones

Points to Remember

Auxins are produced at the tip of stems and roots from where they migrate to the zone of elongation.

Plant and Animal Hormones (Science)

Points to Remember

·                 Auxins are produced at the tip of stems and roots from where they migrate to the zone of elongation.

·                 Cytokinins are the plant hormones that promote cell division or cytokinesis in plant cells.

·                 Gibberellins induce the formation of seedless fruit and parthenocarpic fruits.

·                 Abscisic acid is a growth inhibitor which regulates abscission and dormancy. It increases tolerance of plants to various kinds of stress.

·                 Ethylene is a gaseous plant hormone mainly concerned with maturation and ripening of fruits.

·                 The pituitary gland regulates and controls other endocrine glands and so is called as the “Master gland”.

·                 The hormones secreted by the thyroid gland are triiodothyronine (T3), and tetraiodothyronine or thyroxine (T4)

·                 The parathormone act on bone, kidney and intestine to maintain blood calcium levels.

·                 Pancreas secretes insulin and glucagon.

·                 They maintain blood glucose level.

·                 Adrenal cortex secrete coritsol and aldosterone and adrenal medulla secretes epinephrine and norepinephrine.

·                 The sex glands are of two types the testes and the ovaries which secrete testosterone and estrogens respectively.





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