Bio 2052- Chapter 8

Why do most plant leaves appear green?

Chlorophyll pigments in plant cells reflect green wavelengths of light.

Consider what happens to energy in photosynthesis. How does this differ from what happens to energy in cellular respiration?

In photosynthesis, energy is captured from light, whereas in cellular respiration energy is transferred from storage molecules to ATP.

Choose all the events that occur during the light-dependent reactions of photosynthesis.

Light energy is used to excite electrons on specific chlorophyll molecules. H ions are used to help produce the energy carriers, ATP and NADPH. A concentration gradient forms as excited electrons help move H ions.

Which of the following scenarios is a direct effect of the absence of carbon dioxide during photosynthesis?

The carbon fixation stage of the Calvin cycle would be unable to synthesize the sugar 3-PGA.

Which statement describes the function of photosynthetic pigments in leaves?

They capture light energy and remove electrons from a donor.

Heterotrophs

consumers unable to produce organic compounds from inorganic materials cannot make their own food depends on other organisms for energy

Plants synthesize their own food in the form of sugars during the process of photosynthesis. Which of the following statements describe photosynthesis?

is a cellular process that occurs in the chloroplasts of plant cells converts carbon dioxide to sugars, releasing oxygen produces sugars for the plant using the energy from sunlight

Which statements describe characteristics of stomata in plants?

permit carbon dioxide to enter and oxygen to escape from a plant are pores enclosed by guard cells that are located on plant surfaces

Autotrophs

producers many use photosynthesis to produce organic compounds use inorganic materials to produce energy make their own food