(i)

I → (Raft of) eggs
II → Larva
III → Pupa
IV → (Adult) mosquito

(ii)

How the larva obtains oxygen

It takes oxygen from the atmosphere/surface of water through its breathing tubes.

(iii)

Methods of controlling pupa

1. Introducing predators such as fishes into stagnant water or pond water/use of biological methods of control
2. Pouring of oil/kerosene on surface of the water
3. Draining of stagnant water

Methods of controlling adult mosquito

1. Spray with/Use of insecticides to kill adult mosquito
2. Use of mosquito coil
3. Clearing of weeds/bushes around houses
4. Use of special electric bulbs
5. Use f special paints such as Inesfly
6. Use of treated mosquito net