Question

◆ What will happen if a plant is given excess of a particular ?hormone ?

◆ Do plants have receptors ?

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Answer 1

Answer1--

Plant hormones are chemicals or molecules present in plants that cause certain changes in them and helps in adapting to the environment. 

The major plant Harmons are --

#Gibberellins
#Auxin
#Cytokinins
#Abscisic acid

So if any of these Harmon will be given in access to plant then they will affect plant in following manner--

If there would be access of Auxin then--
=>Auxin stimulates the production of ethylene. Excessethylene (also native plant hormone)can inhibit elongation growth, cause leaves to fall (abscission), and even kill the plant.

If there would be access of Gibberellins then--
=>Since Gibberellins regulates growth, applications of very low concentrations can have a profound effect while too much will have the opposite effect.

If there would be access of Cytokinins then --
=>Cytokinins and auxins often would not work together, and the ratios of these two groups of plant hormones affect most major growth periods during a plant's lifetime.

If there would be access of Abscisic acid then--
=>Inhibits shoot growth but will not have as much affect on roots or may even promote growth of roots.

Answer2--

Yes, Plants also have receptors
In plants receptors are those receptors located on the sense organs of living organisms which on receiving an environmental stimulus send an informative impulse to brain through neurons. These are the specialised tips of some nerve cells.