ECOLOGY
CHEMICAL CYCLES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
By limiting the growth of plants
|
|
|
By destroying nitrogen-fixing bacteria in the soil
|
|
|
By decreasing the food supply of primary consumers
|
|
|
By entering aquatic (water) ecosystems through runoff and causing algal blooms
|
Detailed explanation-1: -Too much nitrogen and phosphorus in the water causes algae to grow faster than ecosystems can handle. Significant increases in algae harm water quality, food resources and habitats, and decrease the oxygen that fish and other aquatic life need to survive.
Detailed explanation-2: -Excess nitrogen can cause overstimulation of growth of aquatic plants and algae. Excessive growth of these organisms, in turn, can clog water intakes, use up dissolved oxygen as they decompose, and block light to deeper waters.
Detailed explanation-3: -Algal blooms can be dramatic and are a result of excess nutrients from fertilizer, wastewater and stormwater runoff, coinciding with lots of sunlight, warm temperatures and shallow, slow-flowing water.
Detailed explanation-4: -Too much fertilizer can actually kill the plant and excess fertilizer can runoff into streams and lakes causing toxic algal blooms that are harmful to aquatic life and even people and their pets. Excess fertilizer runoff from lawns and agricultural applications also contribute to aquatic “dead zones” in coastal areas.
Detailed explanation-5: -Recycling drainage water can reduce or even potentially eliminate nitrate loss by reducing the water that leaves the site. Drainage water recycling has broad potential, but the size of the water storage reservoir will be the limiting factor in most situations.