Earth 2: Sections 2.1 - 2.5

Which of the following statements are true (select all that apply)?

•  

  negative feedback destabilizes systems

•  

  negative feedback stabilizes systems

•  

  positive feedback stabilizes systems

•  

  positive feedback destabilizes systems

Oxygen is depleted in hypoxic waters by

• bacteria

•  

  Nitrogen and Phosphorous

• runoff

•  

  phytoplankton

The radioisotope uranium-235 (235^U) has a half-life of 0.7 billion years.  If I start with 1lb of 235^U, how much will be left after 1.4 billion years?

• none

• 1/4 lb

• 1/2 lb

• 1/8 lb

Compared to a solution with a pH of 1, a solution with a pH of 2

• has 10 times the concentration of H+ ions

• has 1/2 the concentration of

  H+ ions

• has twice the concentration of H+ ions

• has 1/10 the concentration of

  H+ ions

Which of the following is not a form of potential energy?

•  

  The energy stored in the bonds among atoms (chemical energy)

•  

  The energy stored in a compressed spring.

•  

  The energy that holds atomic nuclei together (nuclear energy)

•  

  The energy associated with the flow of water in a river.

The first law of thermodynamics states that energy is conserved, meaning

• it cannot be created or destroyed.

•  

  there is a limited amount of energy, and the universe partitions it accordingly.

• it tends to change from a less-ordered state to a more-ordered state.

• it cannot be converted from one form to another.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

The second law of thermodynamics states that systems tend to move toward disorder.  However, a living organism represents a localized increase in order.  This is made possible by

•  

  breaking the laws of physics.

•  

  the addition of mass as the organism grows.

• the input of energy, either from the sun or by eating other organisms

• the conversion of kinetic energy into chemical energy.

Tags

NGSS.HS-LS1-7

The net equation for cellular respiration (shown to the right) is the exact opposite of the net equation for

•  

  chemosynthesis

• photosynthesis

• heterotrophs

• thermodynamics

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-7

The energy produced by autotrophs that remains after cellular respiration and that is used to generate biomass is called

•  

  gross primary production

•  

  chemical production

•  

  secondary production

•  

  net primary production

Tags

NGSS.HS-LS2-4

Which of the following is not a hydrocarbon?

• 
• 
• 
•