Plant Hormones
Auxins: These are indole compounds. Helps the cells grow longer, rooting of stems, promote flowering, prevent early dropping of fruits and leaves but enhance dropping of old leaves. It is also used as weed killer of dicots.
Gibberellins: helps in the growth of stems, elongation of fruits. All are acidic.
Cytokinins: Promote cell division.
Ethylene: Hastens ripening of fruits by increasing their respiration rate.
Abscisic acid: inhibits growth, leads to wilting of leaves.
Miscellenous
Thyroxin causes 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 fr