Tag: sense organs in animals

Etheophon is the most widely used growth regulator for the source of ethylene, Auxins used to promote shoot elongation and carbohydrates are produced in mature leaves and will get transported to other parts of the plants. but gibberellins won't promote the growth of plumule and radicle in seed germination.

Auxin induces shoot apical dominance. The axillary buds are inhibited by auxin, as a high concentration of auxin directly stimulates ethylene synthesis in lateral buds, causing inhibition of their growth and potentiation of apical dominance. When the apex of the plant is removed, the inhibitory effect is removed and the growth of lateral buds is enhanced. Auxin is sent to the part of the plant facing the light, and this promotes growth towards that direction. 

Gibberellins regulate the cell growth and influence various developmental processes, including stem elongation, germination, dormancy, flowering, sex expression, enzyme induction, and leaf and fruit senescence. Ethylene promotes ripening. Auxins are responsible for apical dominance. Abscisic acid regulates the rate of transpiration. 

Abscisic acid regulates leaf fall and dormancy.

• Plant hormones are also known as phytohormones, they are chemicals that regulate plant growth. 
• Plant hormones are signal molecules produced within the plant and occur in extremely low concentrations. 
• Hormones regulate cellular processes in targeted cells locally and, moved to other locations, in another functional part of the plant. 

• Gibberellins are phytohormones that initiate mobilization of storage materials in seeds during germination. 
• They also cause elongation of stems, stimulate bolting in biennials stimulate pollen tube growth. 
• Gibberellins include a large range of chemicals that are produced naturally within plants and by fungi. 
• Gibberellins are important in seed germination, affecting enzyme production that mobilizes food production used for the growth of new cells. 

• In animals, there are various glands that produce different hormones but such glands are absent in the plants. Instead, each cell is capable of producing hormones. 
• Plant hormones shape the plant, affecting seed growth, time of flowering, the sex of flowers, senescence of leaves, and fruits. 
• They affect which tissues grow upward and which grow downward, leaf formation and stem growth, fruit development and ripening, plant longevity and even plant death. 
• Hormones are vital to plant growth and lacking them, plants would be mostly a mass of undifferentiated cells. So, they are also known as growth factors or growth hormones.

• A class of plant hormones called auxins coordinates the root growth process.
•  Auxins play a key role in bending the plant roots towards the water because they cause one side of the root to grow faster than the other and thus the bending of the root. 

Cytokinin is a plant hormone which promotes cell division. Rest all are present in human body.

• Auxins- play a key role in tropism (controlling the direction of plant growth).