Chapter 5

A cat eats a bird, which ate a caterpillar that chewed on a weed. Which organisms are autotrophs? Which are heterotrophs?

Plants use____ as an energy source to drive photosynthesis. a. sunlight b. sugars c. \(\mathrm{O}_{2}\) d. \(\mathrm{CO}_{2}\)

The carbon that land plants use for photosynthesis comes from _____. a. glucose b. the atmosphere c. water d. soil

In cyanobacteria and photosynthetic eukaryotes, the light-dependent reactions proceed in/at the _____ a. thylakoid membrane b. plasma membrane c. stroma d. cytoplasm

Closed stomata ____ . a. limit gas exchange b. permit water loss c. prevent photosynthesis d. minimize photorespiration

Using multiple pigments allows autotrophs to ___ a. be multicolored in fall b. live where there is no water c. fix carbon more efficiently d. use more wavelengths of light for photosynthesis

Which of the following statements is incorrect? a. Pigments absorb light of certain wavelengths only. b. Many accessory pigments are multipurpose molecules. c. Chlorophyll \(a\) is green because it absorbs green light.

In the light-dependent reactions, ____ a. carbon dioxide is fixed b. electrons flow through electron transfer chains c. \(\mathrm{CO}_{2}\) accepts electrons

When a photosystem absorbs light, _____ . a. water forms and exits the cell b. electrons are transferred to ATP c. its special pair releases electrons d. rubisco fixes carbon

The atoms in the oxygen molecules released during photosynthesis come from ___ . a. sugars b. \(\mathrm{CO}_{2}\) c. water \(\mathrm{d} . \mathrm{O}_{2}\)

In the light-independent reactions, ____ a. carbon is fixed b. electrons flow through electron transfer chains c. ATP forms

The Calvin-Benson cycle starts with ____ a. the absorption of light energy b. carbon fixation c. the release of electrons from photosystem II d. NADP \(^{+}\) formation

In many plants, photorespiration caused by ___ during the day can make sugar production a. photosynthesis running b. water availability c. stomata closing d. carbon fixation

Match the term with the best description. $$ \text {PGAL } \quad \quad \text {a. self-feeder} $$ $$ \text {autotroph} \quad \quad \text {b. site of photosystems} $$ $$ \text {heterotroph} \quad \quad \text {c. Calvin-Benson cycle product} $$ $$ \text {pigment} \quad \quad \text {d. consumer} $$ $$ \text {carbon dioxide} \quad \quad \text {e. carbon-fixing enzyme} $$ $$ \text {rubisco} \quad \quad \text {f. like an antenna} $$ $$ \text {thylakoid membrane } \quad \quad \text {g. big in the atmosphere} $$ $$ \text {wavelength} \quad \quad \text {h. part of a photosystem} $$ $$ \text {special pair } \quad \quad \text {i. related to energy} $$