Question

Function of the following harmone 1.auxins 2. cytokinins 3, gibberellins, 4. ethylene, 5. abscisic acid.

Answer 1

Explanation:

There are five major plant hormones which are Auxin, Cytokinin, Gibberellin, Ethylene and Abscisic acid. Functions of these hormones are as follows:

1. Auxin

Auxin induces cell elongation, maintains apical dominance, initiates root formation, prevent abscission, induces parthenocarpy and is used as herbicide also in synthetic forms.

2. Cytokinin

Cytokinin promotes cell division and organ formation, delays senescence, promotes lateral bud development, enhances cell expansion in cotyledons leaves, promotes Chloroplast development and Chlorophyll synthesis.

3. Gibberellin

Gibberellin promotes stem elongation, seed germination, breaks dormancy, causes elongation of internodes and induces parthenocarpy.

4. Ethylene

Ethylene promotes fruit ripening.

5. Abscisic acid (ABA)

ABA induces stomatal closure, provides stress against salt stress, induces dormancy, causes abscission.

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Answer 2

Answer:

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Explanation:

1)Auxins are a powerful growth hormone produced naturally by plants. They are found in shoot and root tips and promote cell division, stem and root growth. They can also drastically affect plant orientation by promoting cell division to one side of the plant in response to sunlight and gravity.

2)Cytokinins (CK) are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth, and leaf senescence.

3)Gibberellins (GAs) are plant hormones that regulate various developmental processes, including stem elongation, germination, dormancy, flowering, flower development, and leaf and fruit senescence. GAs are one of the longest-known classes of plant hormone.

4)Ethylene (IUPAC name: ethene) is a hydrocarbon which has the formula C. 2H. 4. or H2C=CH2. It is a colorless flammable gas with a faint "sweet and musky" odour when pure.

5)Abscisic acid (ABA) is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.

Abbreviations: ABA

Chemical formula: C15H20O4

Melting point: 163 °C (325 °F; 436 K)