The Phosphorus Cycle

Question 1

is an essential nutrient for living processes; it is a major component of nucleic acid and phospholipids, and, as calcium phosphate, makes up the supportive components of our bones.

Answer 1

Phosphorus

Question 2

is often the limiting nutrient (necessary for growth) in aquatic ecosystems

Answer 2

Phosphorus

Question 3

Phosphorus occurs in nature as the

Answer 3

phosphate ion (PO43−). exponent ung 3- sa taas

Question 4

The movement of phosphate from the ocean to the land and through the soil is extremely slow, with the average phosphate ion having an oceanic residence time between ________ and _______

Answer 4

20,000 and 100,000 years.

Question 5

True or False: Weathering of rocks and volcanic activity releases phosphate into the soil, water, and air, where it becomes available to terrestrial food webs.

Answer 5

True

Question 6

Phosphate enters the oceans via 3 ways.

Answer 6

surface runoff, groundwater flow, and river flow

Question 7

True or False: Phosphate dissolved in ocean water cycles into marine food webs. Some phosphate from the marine food webs falls to the ocean floor, where it forms sediment.

Answer 7

True

Question 8

Excess ____ and _____ that enters these ecosystems from fertilizer runoff and from
sewage causes excessive growth of microorganisms and depletes the dissolved oxygen, which leads to the death of many ecosystem fauna, such as shellfish and finfish.

Answer 8

Phosphorus and Nitrogen (sana binasa mo tanong khit mahaba)

Question 9

an area within a freshwater or marine ecosystem where large areas are depleted of their normal flora and fauna; these zones can be caused by eutrophication, oil spills, dumping of toxic chemicals, and other human activities.

Answer 9

Dead zone

Question 10

Number of dead zones as of 2008

Answer 10

400

Question 11

One of the worst dead zones is off the coast of the United States in the Gulf of Mexico, where fertilizer runoff from the Mississippi River basin has created a dead zone of over 8463 square miles.

Answer 11

wala tandaan mo lang to by heart and soul amen

Question 12

The __________ ___ has long been valued as one of the most scenic areas on Earth; it is now in distress and is recognized as a declining ecosystem.

Answer 12

Chesapeake bay

Question 13

200,000 acres of oyster reefs existed in the bay in the 1700s, but that number has now declined to only 36,000 acres. Oyster harvesting was once a major industry for Chesapeake Bay, but it declined 88 percent between 1982 and 2007.

Answer 13

tandaan mo pero feel ko wala basta basahin mo ung chesapeake mamaya andon tas hmp

Question 14

Many disease-resistant varieties
(developed at the ____________) are
now available and have been used in the construction of experimental oyster reefs.

Answer 14

Virginia Institute of Marine Science for the College of William and Mary