What is Gypsum powder made of?
Which Type Of Farming Is Appropriate In Hilly Areas?
What are the three stages of conventional sewage treatment?
- biodegradable waste
- non-biodegradable waste
- glass waste
Which process removes the solids like faeces and other substances from the wastewater?
(A) Ploughing along contour lines
(B) Strip cropping
(D) Mixed farming
- A and B
- A and C
- B and D
- B and C
- It is a plastic dustbin outside house.
- Dumpings are covered with a thick layer of mud.
- The whole set up is layered with plastic.
- It produces compost.
Septic tanks, chemical toilets, composting pits are the examples of low cost __________ systems.
- Acidobacillus ferroxidens
- Alcanovorax borkumensis