4.3 The Chloroplast

Identify the principal role of cellular respiration.

• To convert solar energy into the chemical energy of sugars

• To convert kinetic energy into the chemical energy of sugars

• To convert the chemical energy of sugars into the chemical energy that fuels life's processes

• To convert the chemical energy of sugars into heat to maintain an elevated body temperature

Identify the principal role of photosynthesis.

• To convert solar energy into the chemical energy of sugars

• To convert kinetic energy into the chemical energy of sugars

• To convert the chemical energy of sugars into the chemical energy that fuels life's processes

• To convert the chemical energy of sugars into heat to maintain an elevated body temperature

The chemical reactions of photosynthesis occur in which cellular organelle?

• Chloroplasts

• Nucleus

• Mitochondria

• Ribosomes

How does water enter a plant?

• Through the roots

• Through the stomata

• Through the leaf

• Through the grana

Which of the following best describes the chemical equation for photosynthesis?

• Carbon dioxide + Sugar + Energy = Oxygen + Water

  
  

• Oxygen + Water + Carbon dioxide = Sugar + Energy

  
  

• Water + Carbon dioxide + Energy = Sugar + Oxygen

  
  

• Oxygen + Sugar = Water + Carbon dioxide + Energy

  
  

How do we know green light is not absorbed by chlorophyll?

• Green light is the wavelength of light that is reflected instead of absorbed by the chloroplasts

• Not enough of the green light penetrates the ozone layer and makes it to the plant.

  
  

• Green light has such a small wavelength that most of it goes straight through the leaves without interacting with the chlorophyll.

  
  

• Green light does not have enough energy to excite an electron in the photosystem

Name the fluid-filled interior of the chloroplast.

• Thylakoids

• Stroma

• Grana

• Stomata

Why do some leaves change color (red, yellow, orange, etc.) in the fall?

• The chlorophyll molecule is modified to absorb different wavelengths of light.

• The chlorophyll molecule breaks down and other pigments now become visible.

• When leaves die, the chlorophyll molecules are no longer visible.

• Cold weather denatures the chlorophyll molecule, and it begins to reflect different colors.

Which of the following organism is not a consumer?

• A lion

• A human

• A mushroom

• A oak tree

What is the role of chloroplasts in animals?

• To produce ATP

• To carry out photosynthesis

• To produce sugars

• There is no role, as animals do not have chloroplasts