Unit 8

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

• lower BOD

• algal blooms

• oxygenation

• increased DO

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-5

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-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

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

• nitrates

• phosphates

• carbon dioxide

• dissolved oxygen

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

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-ESS3-3

NGSS.MS-LS2-3

NGSS.MS-LS2-4

The higher the temperature, the more dissolved oxygen in water.

• True

• False

How do bacteria affect Dissolved Oxygen (DO) in water bodies?

• increase DO through decomposition

• decrease DO through decomposition

• DO stays the same

• bacteria multiply DO by 8

Tags

NGSS.MS-LS2-4

which organisms are most affected by bioaccumuation?

• Top predators

• Producers

• Primary Consumers

• Herbivores

Two examples of chemicals which bioaccumulate are:

• oxygen and carbon dioxide

• glucose and carbon dioxide

• haemoglobin and nitrogen

• DDT and mercury

What is the lethal dose of the following substance?

• 1000 nM

• 2000 NM

• 5000 nM

• 10,000 nM

What organisms end up with the highest levels of mercury?

• 
• 
• 
• 

Tags

NGSS.HS-ESS3-1