Question

answer the 16, 17 a, b,18 fast​

Answer 1

16)Common food chain of a pond ecosystem.

Phytoplanktons —» Zooplanktons —»small fishes —» large fishes —» birds.

17) Oxidation reaction

Ans:

A chemical reaction which involves addition of oxygen or removal of hydrogen or loss of electron(s)is called oxidation.

i ) C is oxidised to CO.

ii) ZnO is reduced to Zn.

18). Reaction between plaster of Paris and water.

CaSO4.1/2H2O + 3/2H2O → CaSO4.2H2O.