PLEASE HELP!!! 1. Does the concentration of gibberellic acid have any effect on

Question

PLEASE HELP!!!

1. Does the concentration of gibberellic acid have any effect on retarding or stimulating germination? If so which concentration? 0 mg/l? 0.001 mg/l? 0.01 mg/l? 0.1 mg/l? 1.0 mg/l? or 10 mg/l? Why is this concentration the best and why won' t the other concentrations be as effective?

2. Does the concentration of kinetin have any effect on retarding or stimulating senescence? If so whcih concentration? 0 mg/l? 0.001 mg/l? 0.01 mg/l? 0.1 mg/l? 1.0 mg/l? or 10 mg/l? Why is this concentration the best and why won' t the other concentrations work?

3. What is a possible mechanism to explain the action of kinetin on senescence?

Explanation / Answer

1. Gibberellin is most effective in promoting germination at concentration of 0.01 and 10 mg/L. High concentration reverses the effect.

2. Cytokinin delays senescence or ageing in plants. Low concentrations are effective. High concentration reverses the effect.

Mechanism of action of kinetin on senescence:

Kinetin delays senescence in leaves by maintaining protein synthesis in leaves and inhibiting protein degradation.

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