'Vegetation is the true index of climate'. This statement is associated with:

Who made the following statement – 'Vegetation is the true index of climate.'?

Which of the following statement is not true?

Which of the following season is associated with the concept of 'Retreating Monsoon' ?

In Koppen's Climatic classification of India the central Ganges valley is represented by :

Which one of the following statements is not correct?