Helo explain plant harmones
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.
Definition - What does Plant Hormone mean?
Plant hormones are chemicals in plants that regulate cellular processes. They are usually found in small amounts throughout the plant. These hormones are very important as they determine many different attributes of a plant. Plant hormones can be natural or synthetic.
Plant hormones are also known as phytohormones.
Plant Hormone
Plant hormones play a crucial role in plant biology as they determine a wide variety of a plant's characteristics. These characteristics include physical appearance such as the formation of leaves, flowers, and stems, development of fruit, and lifespan. Plant hormones are not only found in higher plants, but are found in simple forms of plant life such as algae.
The five major plant hormones are auxins, gibberellins, cytokinins, abscisic acid, and ethylene. These hormones will work independently or together to influence plant growth and health. Auxins and gibberellins help promote plant growth, particularly in stem elongation. Cytokinins promote cell division and are produced in growing areas of plants. Abscisic acid plays a role in cell dormancy and is involved in the opening and closing of the stomata on leaves. Finally, ethylene is a gas that is produced by ripening fruits.
Ethylene is one particular hormone that is often synthetically produced so gardeners can purposefully ripen fruits of many plants at the same time.