Keystone Review

Four students classified the main energy conversions that occur during photosynthesis and cellular respiration. Which student best classified the energy conversions that occur in the two processes.

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-7

The graph shows how the activity of an enzyme changes at different temperatures.

Which statement best describes what happens to the enzyme when the temperature of the reaction increases to 63°C?

• The enzyme is used up and the reaction stops

• The enzyme begins to decrease the rate of the reaction

• The enzyme continues to increase the rate of the reaction

• The enzyme changes shape and can no longer speed up the reaction

Water molecules have positive and negative charges which gives it unique properties. What icharacteristic is shown in the image?

• Polarity

• Hydrogen Bonds

• Cohesion

• Adhesion

Tags

NGSS.MS-PS1-1

Which statement best explains why these cells have structural differences?

• The cells have different functions.

• The cells evolved in different organisms.

• One of the cells develops into the other type of cell.

• One of the cells is more primitive than the other cell.

Tags

NGSS.HS-LS1-2

NGSS.HS-LS1-4

Bacteria are single-celled microorganisms. The cell walls of these microorganisms serve as barriers to chemicals that might affect the processes that occur within a bacterial cell. Antibiotics are a type of substance used to stop bacterial growth. Some antibiotics cause the bacterial cell wall to rupture. The function of which human organ is most like the cell walls of bacteria? 

• heart

• liver

• pancreas

• skin

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Which student accurately describes the products of mitosis?

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.HS-LS1-4

What is the role of a keystone species in an ecosystem?

• They are the most abundant species in the ecosystem.

• They have a disproportionately large impact on their environment relative to their abundance.

• They are the largest predators in the ecosystem.

• They are the primary producers in the ecosystem.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which of the following is an example of a keystone species?

• Elephant in the African savanna

• Kangaroo in the Australian outback

• Sea otter in the kelp forest

• Panda in the bamboo forest

Tags

NGSS.HS-LS2-6

NGSS.HS-LS4-5

How does the removal of a keystone species affect an ecosystem?

• It leads to increased biodiversity.

• It causes a trophic cascade that can alter the ecosystem structure.

• It has no significant impact on the ecosystem.

• It results in the immediate extinction of all species in the ecosystem.

Tags

NGSS.HS-LS2-6

NGSS.HS-LS4-5

In a food web, what is the primary function of a keystone species?

• To provide energy to primary consumers

• To regulate the population of other species

• To decompose organic matter

• To produce oxygen through photosynthesis

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

NGSS.MS-LS2-5