List the names of chemicals whose biomagnification result in following diseases in humans.
(a) Minamata disease
(b) Itai-itai disease
(ii) Name the fertilisers .whose excessive presence in waterbodies result in algal bloom. What is the consequence of eutrophication?
(i) (a) Mercury (b) Cadmium
(ii) Nitrates and phosphate fertilisers. As a result of eutrophication, algal bloom occurs. When these algae die, aerobic decomposers become active and consume dissolved oxygen of water to decompose these dead algae. In the absence of dissolved oxygen, all aquatic life (including fishes) dies in the waterbody.