Chapter 12 - Soils and Agriculture

Native people in which region of the world first domesticated corn approximately 9000 years ago?

• West Africa

• Mexico

• India

• Spain

The wild ancestor to corn is called:

• Amaranth

• Millet

• Sorghum

• Teosinte

Tags

NGSS.MS-LS4-2

To genetically engineer crops, scientists extract genes from the DNA of one organism and transfer them into the DNA of another. We call the genetically modified plant:

• hybrid

• transgenic

• clone

• chimera

Tags

NGSS.MS-LS4-5

What concerns some scientists about crops that have been genetically engineered?

• They might reduce photosynthesis in native plants

• They might crossbreed with native crops and contaminate their genetic makeup

• They might spread new diseases to wild plants causing species extinction

• They might cause all native crops to stop reproducing

Tags

NGSS.MS-LS2-5

NGSS.MS-LS2-4

NGSS.MS-LS4-4

In which biome would chemical weathering occur the fastest:

• tropical rainforests

• arctic tundra

• grasslands

• tropical dry forest

When rivers carry away eroded soil and drop it off at their mouths, what landform is usually created by this deposition?

• Island

• Delta

• Peninsula

• Valley

Tags

NGSS.MS-ESS2-2

Identify the different layers of soil in the diagram.

a

b

c

d

e

Subsoil

Parent Material

Bedrock

Organic Layer

Topsoil

Match the following soil textures:

• Silt

• particles 0.002-0.05 mm

  (small)

• Loam

• an even mixture of all 3 particle sizes

• Sand

• particles < 0.002 mm

  (very small)

• Clay

• particles 0.05-2 mm (large)

Match the following characteristics of world soils:

• Tropical soils

• Dark, fertile soil full of organic matter and nutrients.

• Temperate grassland soils

• Highly weathered and low in nutrients

• Arctic soils

• Contains a frozen layer called permafrost most of the year

Where did the Dust Bowl occur?

Tags

NGSS.MS-ESS3-4

NGSS.MS-ESS2-2