Human Environmental Impacts

Eutrophication is caused by

• excess nutrients building up in the water.

• industrial point-source pollution.

• unlined landfills and septic tanks.

• wastewater from homes mixing with drinking water.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-3

NGSS.MS-ESS3-4

NGSS.MS-ESS3-3

As P and N build up, the probability of _______________ increases.

• lower BOD

• algal blooms

• oxygenation

• increased DO

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

NGSS.MS-LS2-3

How does eutrophication cause the death of aquatic organisms

• the build up of carbon dioxide in the water

• the lack of nitrogen in the water

• the lack of carbon dioxide in the water

• the lack of oxygen in the water

Tags

NGSS.MS-LS2-4

How can an algal bloom (eutrophication) lead to a decrease in dissolved oxygen? Select all that apply.

• Algae is a heterotroph and consumes more oxygen than it produces.

• Decreased light penetration limits photosynthesis below the surface.

• Bacteria consume oxygen as they decompose dead algae and other organisms.

• Decomposes that would have produced oxygen are outcompeted by algae.

Tags

NGSS.MS-LS2-4

The two critical nutrients in eutrophication are... (select two)

• nitrates

• phosphates

• carbon dioxide

• dissolved oxygen

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

In eutrophication, dissolved oxygen levels decrease because

• bacteria use it as they decompose organic material

• algae uses it during photosynthesis

• it reacts with hydrogen to form H2O (water)

• fish use it up as they consume algae

Tags

NGSS.MS-LS2-3

A new golf course is built next to a river. Over the past several months, the nitrate levels of the water in the river have been increasing. Which best explains the cause of the increasing nitrate levels?

• increased growth of algae

• decreased biodiversity

• runoff from fertilizer

• chemical reactions with pesticides and fertilizers

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Which process would most likely increase the dissolved oxygen level in a freshwater lake?

• algae bloom

• lake turnover

• photosynthesis

• respiration

Tags

NGSS.MS-LS1-6

How do excess nutrients typically enter a body of water?

• rain water washes lawn and agricultural fertilizers into the ecosystem

• Scientists are adding fertilizer to the ecosystem

• Nitrogen fixing bacteria are creating an excess of organic nitrogen compounds

• algae are causing denitrification in the water

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-3

NGSS.MS-ESS3-4

Why do nitrates and phosphates cause algal blooms?

• They are critical plant nutrients.

• They kill off competition.

• Because algae grow faster than decomposers.

• Nitrates and phosphates are density independent limiting factors.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1