Match the items in column I and column II and choose the correct option:

The correct match is:

A. UV – (iii) Snow blindness

Over exposure to UV rays causes Snow blindness (painful and temporary loss of vision)

B. Biological Organic Matter – (iv) BOD

When Biological organic matter such as dead plants, leaves and other biodegradable waste, is acted upon by microorganisms to decompose then these microorganisms consume oxygen to support the process of decomposition which leads to increased Biological Oxygen Demand (BOD).

C. DDT – (i) Biomagnification

The concentration of DDT increases at successive trophic levels because a toxin like DDT can’t be metabolised by the organisms. This process is called Biomagnification.

D. Phosphates – (ii) Eutrophication

Increased amount of phosphates in a water body increase its fertility which causes excessive growth of aquatic plants and algae in the water body. This process is called Eutrophication.