8th Science CBA 3 Review

Buffelgrass is an invasive species of grass from Africa that outcompetes native Texas grasses for space and water. Which long-term change to a Texas grassland would most likely occur due to the introduction of buffelgrass?

• The population of native grasses will increase.

• The population of native grasses will decrease.

• Buffelgrass offspring will develop traits like those of native grasses.

• Buffelgrass offspring will develop traits like those of other invasive species.

Tags

TEK 8.11 A

Below is a Texas Gulf Coast Food web. CIRCLE the TWO populations that the bobcat and diamondback rattlesnake will compete for IF the mouse and swamp rabbit populations decreased.

Tags

TEK 8.11 B

A student is building a model of a solar eclipse. Solar eclipses occur only during a new moon phase.

Which motion best demonstrates a solar eclipse?

• The moon moves between the sun and Earth, casting a shadow of the moon on Earth.

• The sun moves between the moon and Earth, casting a shadow of the sun on Earth.

• Earth moves between the sun and the moon, casting a shadow of Earth on the moon.

• Earth moves between the sun and the moon, casting a shadow of the moon on the sun.

Tags

TEK 8.7 B

Humans depend upon food that comes from the ocean.

Some human activities negatively impact these food supplies.

Which statement provides the best evidence that human activities contribute to this impact?

• Human visitors to coral reef systems break corals growing on rocks.

• Humans catch marine fish at a faster rate than the fish are able to reproduce.

• Humans raise fish in a hatchery for commercial sale.

• Humans construct artificial reefs to attract tourists.

Tags

TEK 8.11 C

The model shows Earth in four different positions in its orbit around the sun.

1. Which numbered position of Earth represents summer in the United States?

2. Why does the United States experience summer when the earth is in this position?

Tags

TEK 8.7 A

Two plant species that grow in the same area are shown. Which statement best explains a difference between Plant 1 and Plant 2?

• Plant 1 obtains more water from the soil because of its root surface area and root

  depth.

• Plant 1 obtains more sunlight because of its root surface area and root depth.

• Plant 2 obtains more water from the soil because of its root surface area and root

  depth.

• Plant 2 obtains more sunlight because of its root surface area and root depth.

Tags

TEK 8.11 A

Trees lose water through transpiration, when water evaporates from leaves.

The list describes types of tree leaves that help reduce the amount of transpiration.

Which of these are likely to be observed in an area experiencing a long-term drought?

Select TWO answer choices.

• Trees with broad leaves will be more healthy than trees with needlelike leaves.

• Trees with leaves that have waxy coverings will be more healthy than trees without waxcovered

  leaves.

• Trees with broad leaves will be more healthy than trees with small, flat leaves.

• Trees with leaves covered by hairlike structures will be more healthy than trees with

  leaves without any hairlike structures.

Tags

TEK 8.11 B

Hikers look at a topographic map of an area named Green Peak. The Green Peak area is made

up of only limestone rock. The map is shown.

Which location around Green Peak is likely to experience the most erosion over time?

• Location W, because location W has the gentlest slope

• Location X, because location X is near the bottom of a slope

• Location Y, because location Y has the steepest slope

• Location Z, because location Z is the flattest slope

Tags

NGSS.MS-ESS2-2

Farmers can best reduce negative effects on the water quality of nearby streams and lakes by planting crops that —

• produce less oxygen

• produce less carbon dioxide

• need less fertilizer

• need less solar energy

Tags

TEK 7.8 C

Two oceanic plates are shown in the image.

Their movement results in spreading from the oceanic ridge.

The type of boundary where two plates are moving away from each other is a ________ boundary

• Convergent

• Divergent

• Transform

• Subduction

Tags

TEK 8.9 B