Question 4
Open drain system is a breeding place for which of the following? (a) Flies (b) Mosquitoes (c) Organisms which cause diseases (d) All of these
An open drain system is not a breeding place for which of the following?
Fill in the blanks:
(a) Cleaning of water is a process of removing _______.
(b) Wastewater released by houses is called ________.
(c) Dried _______ is used as manure.
(d) Drains get blocked by ________ and ________.