What is plant hormone??? Give 3 functions of all plant hormones!!! Guys please give an answer that can be written down for the class X CBSE board exam!!! I need it urgently!!!
Answers
The plants do not have a nervous system and sense organs like ear ,nose ,mouth,etc like the animals , but they can still sense things.
The plants coordinate their behavior against environmental changes by using hormones.
The functions of control and coordination in plants is performed by certain chemical substances.These chemical substances are called plant hormones or phytohormones.
There are four major types of plant hormones [phytohormones] . which are involved in the control and coordination in plants.These are :
1)Auxins
2)Gibberellins
3)Cutokinins
4)Abcisic acid
1)Auxins are the plant hormones which promote cell enlargement and cell differentiation. Auxins also promote fruit growth. Auxin hormone is responsible for phototropic and geotropic responses of plants.
2) Gibberellins are plant hormones which promote cell enlargement and cell differentiation in the presence of auxins. Gibberellins help in breaking the dormancy in seeds and buds. They also promote fruit growth. Gibberellins stimulates elongation of shoots of various plants
3) Cytokinins are plant hormones which promote cell division in plants.They also help in breaking the dormancy in seeds and buds. The delay the ageing of leaves.Cytokinins promote opening of stomata .
4)Abscisic acid (ABA) is a plant hormone which functions mainly as a growth inhibitor. Abscisic acid promotes the dormancy in seeds and buds [ this is the opposite of breaking the dormancy]. It also promotes closing of stomata. Abscisic acid promotes falling of leaves.
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Auxins:::-- 1⃣It promotes cell enlargement and cell differentiation.
2⃣ It promotes parthenocarpy.
It helps in the growth of plant hormones.
3⃣These also promote stem and fruit growth.
Gibbereline::::-- 1⃣It promotes Parthenocarpy
2⃣ They promotes cell enlargement and cell differentiation.
3⃣They promotes growth of stem and fruits.
Cytokinnins:::- 1⃣These promote cell division.
2⃣These help in Breaking the dormancy of seeds and buds.
3⃣This delay the ageing in leaves.
4⃣This promote the opening of stomata.
Abscisic acid:::- It promotes the dormancy in seeds and buds.
2⃣It also promotes the closing of stomata.
3⃣It also promotes the effects wilting of leaves.
Ethene(Ethylene):::- 1⃣It promotes growth and ripening of fruits.
2⃣It helps in Breaking dormancy of buds and seeds.
3⃣It promotes yellowing and senescence of leaves.