The main purpose of crop rotation is $\to check the loss of top soil$

$$\frac{3}{4}$$

.

1.বাংলাদেশে সর্বপ্রথম ইকো পার্ক হচ্ছে–

2.সাভারের পূর্ব নাম কী ছিল?

3.গাড়ি চলে না, চরে না, চলে না রে” গানের গীতিকার কে?

4.Rabindranath Tagore relinquished '$Knighthood^{\prime} as a measure of protest against$

5.Which one is not an international forum?

6.The Supreme Court of Bangladesh consists of —

7.The first High Court established in the Indian Sub-Continent was —

8.Which one is not a crime?

9.The present day calendar is based on ____

10.A needle sinks in water whereas a ship made of iron floats on it because____

11.Green Index has been developed by —

12.'Tin Konna^{\prime} is painted by ____