What are the data? How is it arranged? What do you expect? What are important differences you expect? Enumerate and plot your data. A test recommendation requires much more information.

You need to provide more information of your data. So that we can help you. 

What are the non-statistical questions, or did you gather the data with the sole purpose of learning new statistical methodologies?

Please do not use acronyms unless you define them. The acronyms may be standard in your field, but there are few acronyms that are standard across all of biology.

This should not be a difficult problem, at least based on what you have told us. So what have you tried, and why was the result deemed inappropriate?

If you are new to statistical methods, then the simplest approach would be to find a statistician at your university and collaborate. However, we understand that this is not always possible and we will help the best we can.

In your answer to our responses, please make sure to let us know the sample size.

Thanks all,

this is my results ...kindly let me know the suitable statistical test 

No statistical test is necessary. Plot your data. There is no difference. A regression line through A and B will be essentially the same.

You need to repeat the experiment to see if it is reproducible.

No statistical test is appropriate, nor (as Joseph pointed out) necessary. You really need some additional concentrations. I would add 0%, and 95%. If 75% is the maximum, then 0% and either 33% or 66%. I would run replicates. I might go with only 5 to 10 per treatment. You might need more, but this would be a good start. I suspect that variance will change with dose, and it is not clear if your existing data are typical or atypical.