Question

QUESTION 1

1. Which of the followings about the Hypoxia in Gulf of Mexico is not true?

   		Hypoxia refers to increased level of dissolved oxygen in water that is detrimental to aerobic organisms.
   		Hypoxia in Gulf of Mexico is caused by dumping of nutrients from the Mississippi River basin.
   		Ohio River basin contributed to the Hypoxia in the Gulf of Mexico.
   		Level of nutrients in Mississippi River can be reduced in wetlands.

2. When surface water is injected into an aquifer for artificial replenishment of the aquifer, sediments and any pollutants in the surface water must be removed prior to injection to prevent contamination of groundwater.

   True

   False

3. Introduction of large volume of untreated sewer can increase biological oxygen demand (BOD) of a stream.

   True

   False

Answer 1

Hypoxia refers to increased level of dissolved oxygen in water that is detrimental to aerobic organisms is the correct option.

​​Hypoxia refers to a oxygen depletion, which is an environmental phenomenon where the concentration of dissolved oxygen in the water column decreases to a level that can no longer support living aquatic organisms.