1. Indore city of Madhya Pradesh has secured first place in the country in terms of cleanliness.

2. This clean air survey has been done in cities with a population of 10 lakhs.

3. Indore was declared the country's number-one clean city for the first time in 2017.

1. Humus is found in the topmost layer of soil (A-horizon).

2. Humus is a black or brown colored substance which makes the soil fertile.

3. It is an important source of nutrients for plants, and it helps the soil absorb water and air.

4. There are many ways to promote humus, including-

- Leaving crop residues in the field

- Using livestock manure

- making compost

1. Chokhamela was a saint in Maharashtra, India in the 14th century.

2. He was born in Mehna Raja, a village in Deulgaon Raja taluka of Buldhana district.

3. He belonged to the Mahar caste, one of the untouchable castes in India.