Questions

The error is in first part. ‘One of the’ should always be followed by a plural noun, expressing that the speaker chooses one from many. Hence ‘features of travel’ is the correct expression, indicating that there are many interesting features about Himachal Pradesh but the most interesting one among them is the provision of large number of travelers’ lodges.

A sanction is a punishment imposed on another nation, or on individual natives of another nation.

Economic sanctions are characterized as the withdrawal of standard exchange and money related relations for outside and security strategy purposes. They might be extensive, denying business movement as to a whole nation,...

In soil, organic matter consists of plant and animal material that is in the process of decomposing. When it has fully decomposed it is called humus. Soil organic matter serves as a reservoir of nutrients for crops, provides soil aggregation, increases nutrient exchange, retains moisture, reduces compaction,... 

This humus is important for soil structure because it holds individual mineral particles together in clusters.