Which of the following statements regarding clouds is/are correct?

1. Clouds are classified on the basis of altitude and their form.

2. According to altitude they are classified as High, Middle and Low clouds.

3. Stratus, Nimbostratus and Stratocumulus are high clouds.

Select the answer using the code given below:

Consider the following statements regarding 'fronts':

1. The movement of a front causes a slow change in weather in the area over which it moves.

2. Cold fronts are associated with thunderstorms.

3. Warm front is the boundary between an advancing mass of warm air where it is overriding and rising above a mass of colder air.

Which of the statements given above is/are correct?

Consider the following statements regarding soils :

1. Soils having a very high content of sodium and calcium and pH of more than 7.0 are alkaline soils.

2. Black cotton soil had developed on the Deccan basaltic lava under hot and humid conditions.

3. Laterite soils are characterised by a deep weathered layer from which silica has been leached.

Which of the statements given above is/are correct?

Consider the following characteristics of a grassland :

1. An extensive area of mid latitude grasslands are devoid of trees and shrubs.

2. The climate is characterised by hot summers, cold winters and relatively low rainfall occurring mainly in spring and summer.

3. In humid parts, grasses grow to a meter or more in height.

On the basis of the above characteristics, select the correct grassland from the options given below :