Environmental science chapter 23 test

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What can loss of diversity effect? (3 things)

balance of an ecosystem, health, stability

More than __% of the species that have lived on Earth are extinct today

99

What is a trophic level?

feeding level

Periods of mass extinction are followed by...

periods of rapid evolution

HIPPO stands for...

Habitat distruction, Introduction of species, Population growth, Pollution, Over consumption

Overgrazing is when herbavores...

eat to many plants

As human population increases, ________ decreases

biodiversity

If the rain forest got destoyed, ___% of terrestrial biodiversity will be lost.

70

__% of deciduous forests have been destroyed in the United states

50

In the United States, __ hectares are being destroyed each year.

175,000

The Aral Sea used to be the __th largest lake in the world

4

In 1960, the Aral Sea's surface area was ____ sq km

68,000

What two rivers caused the shrinkage of water in the Aral sea

Syr Dayra and Amu Dayra

What does carcinogen mean?

cancer-causing

What is the name of the bachteria that causes Typhoid?

Salmonella typhi

What are the symtoms of Typhoid?

high fever, weakness, loss of appetite, and sometimes a rash.

What is usually inflamed when you get Hepatitis?

Liver

What is the abreviation for Tuberculosis?

TB

What is the name of the bachteria that causes Tuberculosis?

Mycobachterium

What are the symtoms of Tuberculosis

tiredness or weakness, weight loss, fever, night sweats.

What is the "acronym" I use to remember the top ten biggest lakes from biggest to smallest and what are they?

Could super victoria hand my toys back because malory said? Caspian, superior, victoria, heron, michigan, tanganyika, baikal, great bear lake, malawi, great slave lake

There are currently _____ varieties of domestic and wild wheat avalable.

22,000

Why is there such little genetic diversity amoung crop species?

Farmers grow huge amounts of only a few species.

Why does low genetic diversity put a crop at risk from diseases?

More likely to be attacked by pests

About __% of all medicines used in the US come from plants

40

GE stands for

Genetically engineered

Digitalis is used for the treatment of...

heart disease

Wilderness is...

an area where the ecosystem is relatively undisturbed by the activities of humans

A gene bank is a secure place where....

seeds, plants, and genetic material are stored.

The endangered species act was passed by US congress in the year

1973

What does the Endangered species act do?

requires all government to make a list of all species that are in danger of extinction

Clear cutting is....

cutting down a whole ecosystem

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