Name: Chemical Coordination in Animals
Uploaded: 2019-07-19
Duration: 5 min 54 s
Description: There are different categories of hormones that regulate and stimulate different categories of functions in your body. Explore hormones and their types in yo...

Question

Plant physiologists have found that solutions of ABA with concentrations as low as 5.0

μ m o l

dm^-3 will cause stomata to close. How will you prepare a range of solutions of ABA from a stock solution of 1.0 mmol dm^-3 and use the solutions to find the lowest concentration that stimulates stomatal closure in leaves of Arabidopsis thaliana?

Accepted Answer

ABA is a plant growth inhibitor hormone releases due to stimulation by various stress signals in the environment. It acts as antagonist to Gibberellic acid.

Formula for calculation of dilution is as below:

C1V1=C2V2
C1= concentration of initial solution= 1mM
V1= volume of the initial solution=1mmol dm^-3

C2= concentration of the final solution=5 $μ m o l$ dm^-3
V2 = volume of the final solution= C1V1/C2=1 $χ$ 1/0.005 =200mmol dm^-3

Hence, 200mmol dm^-3of ABA solution is required with the lowest concentration of 5.0 $μ m o l$ dm^-3that stimulates stomatal closure in leaves of Arabidopsis thaliana.

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