Chapter 6

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

Photosynthetic autotrophs use _____ from the air as a carbon source and _____ as their energy source.

Chlorophyll \(a\) appears green because it absorbs mainly ______ light. a. violet and red b. green c. yellow d. blue

Light-dependent reactions in plants proceed in the ______. a. thylakoid membrane b. plasma membrane c. stroma d. cytoplasm

When a photosystem absorbs light ______. a. sugar phosphates are produced b.electrons are transferred to ATP c. RuBP accepts electrons d.electrons are ejected from its special pair

In the light-dependent reactions, ______. a. carbon dioxide is fixed b. ATP forms c. sugars form d. \(\mathrm{CO}_{2}\) accepts electrons e. b and c f. a and c

What accumulates inside the thylakoid compartment during the light-dependent reactions? a. glucose b. hydrogen ions c. \(\mathrm{O}_{2}\) d. \(\mathrm{CO}_{2}\)

Light-independent reactions in plants proceed in the _____. a. thylakoid membrane b. plasma membrane c. stroma d. cytoplasm

The Calvin-Benson cycle starts when ______. a. light is available b.carbon dioxide is attached to RuBP c. electrons leave a photosystem II

Which of the following substances does not participate in the Calvin-Benson cycle? a. ATP b. NADPH c. RuBP d. PGAL e. \(\mathrm{O}_{2}\) f. \(\mathrm{CO}_{2}\)

In the light-independent reactions, ______. a. carbon dioxide is fixed b. ATP forms c. sugars form d. \(\mathrm{CO}_{2}\) accepts electrons e. b and c f. a and c

Match each with its most suitable description. ______PGAL formation ______\(\mathrm{CO}_{2}\) fixation ______photolysis ______ATP forms; NADPH does not ______photorespiration ______photosynthesis ______pigment ______autotroph a. absorbs light b. converts light to chemical energy c. self-feeder d. electrons cycle back to photosystem I e. problem in \(\mathrm{C} 3\) plants f. ATP, NADPH required g. water molecules split h. rubisco function