Question

7. a) what are synthetic auxins ?
b) write the physiological effects of gibberellons?
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Answer 1

Answer:

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Explanation:

Physiological Effects of Gibberellins:

Elongation of intact stems: Many plants respond to application of GA by a marked increase in stem length; the effect is primarily one of internode elongation.

Dwarf shoots: ...

Bolting: ...

Dormancy: ...

Seed Germination: ...

Fruit Development: ...

Flowering: ...

Vernalization:

Answer 2

Answer:

Synthetic auxins :

Artificially synthesized auxins that have properties like auxins are called as synthetic auxins

example: 2, 4 D (Dichlorophenoxy acetic acid)

Physical effects of gibberellins

→ Application of gibberellins on plants stimulate extraordinary elongation of internode.

     example: Corn and Pea

→ Treatment of rosette plants with gibberellin induces sudden shoot elongation followed by flowering. This is called as Bolting

→ Gibberellins break dormancy of potato tubers

→ gibberellins promote the production of male flowers in monoecious plants(cucurbits)

→ Gibberellins are efficient that auxins in inducing the formation of seedless fruit - Parthenocarpic Fruits ( Parthenocarpic - development of fruits without fertilization)

example: Tomato