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The explanation of the answer is as follows:
Option 1 states that the leader of an elephant group is a female and the maximum gestation period of an elephant can be 22 months. Both of which are true. Elephant herds are usually led by the oldest female, known as the matriarch, and have the longest gestation period of all mammals - 18 to 22 months.
Option 2 is incorrect as it states the highest elephant population is in Kerala, but the highest elephant population in India is in Karnataka, not Kerala.
Option 3 is incorrect as it states an elephant can normally go on calving till the age of 40 years only, this is not true as elephants can conceive and give birth until they are around 50 years old.
Option 4 is incorrect as it includes the false statements from options 2 and 3 along with the true statement from option 1.
Therefore, the correct answer is option 1 (1 and 2 only).