Question 1

The electrons lost from the reaction center of photosystem II are replaced by electrons from

Accepted Answer

A) photosystem I. 
B) CO2. 
C) H2O. 
D) ATP.

Question 2

In photophosphorylation,energy from electron flow is used to transport from the to the thylakoid compartment,generating a concentration gradient of .

Accepted Answer

A) electrons ...grana ...H+ 
B) H+ ...stroma ...ATP 
C) H+ ...grana ...electrons 
D) H+ ...stroma ...H+

Question 3

Which of the following colors contributes the least energy to photosynthesis?

Accepted Answer

A) green 
B) red 
C) blue 
D) orange

Question 4

According to this figure,how do H+ ions make their way from the stroma to the thylakoid interior?

Accepted Answer

A) through the ATP synthase 
B) through photosystem I 
C) through an electron transport chain molecule 
D) directly through the phospholipids of the thylakoid membrane

Question 5

Which of the following statements about the greenhouse effect is true?

Accepted Answer

A) The greenhouse effect is exacerbated by the use of fossil fuels. 
B) The greenhouse effect will decrease the average temperature of the planet. 
C) The greenhouse effect has no direct relationship with the Industrial Revolution of the 1800s. 
D) The greenhouse effect is reduced by deforestation.

Question 6

Clusters of light- gathering pigments in a photosystem

Accepted Answer

A) absorb electrons. 
B) break down H2O. 
C) pass energy to the reaction center. 
D) are found in the roots of plants.

Question 7

cells in leaves are specialized for photosynthesis.

Accepted Answer

A) Tracheid 
B) Mesophyll 
C) Sclerenchyma 
D) Companion

Question 8

Ozone consists of _ _ oxygen atom(s).

Accepted Answer

A) two 
B) one 
C) three 
D) four

Question 9

Which of the following is an example of a photoautotroph?

Accepted Answer

A) grizzly bears in Alaska 
B) bacteria in our mouth 
C) cyanobacteria in freshwater and marine ecosystems 
D) mushrooms growing on the side of a dead tree

Question 10

Which of the following molecules is both a reactant and a product of photosynthesis?

Accepted Answer

A) glucose 
B) O2 
C) chlorophyll 
D) H2O

Question 11

CO2 enters and O2 escapes from a leaf via

Accepted Answer

A) stroma. 
B) grana. 
C) stomata. 
D) thylakoids.

Question 12

It has been argued that cutting old- growth forests and replacing them with plantations of young trees would help to alleviate the threat of global greenhouse warming.What important fact does this argument ignore?

Accepted Answer

A) Most of the young trees would die within a few years. 
B) Forests play too minor a role in global CO2 dynamics,which are affected far more by marine algae. 
C) Most of the biomass of the cut trees would be added to the atmosphere as CO2 within a few years. 
D) Young trees fix carbon at a lower rate per unit mass than old trees.

Question 13

In the chloroplast,sugars are made in a compartment that is filled with a thick fluid called the

Accepted Answer

A) matrix. 
B) stroma. 
C) stomata. 
D) thylakoid.

Question 14

Plants use sugars as

Accepted Answer

A) a source of electrons for chemiosmosis. 
B) a fuel for cellular respiration and a starting material for making other organic molecules. 
C) a fuel for photosynthesis. 
D) a starting material for the Calvin cycle.

Question 15

What is the name given to organisms that can make their own food and thus sustain themselves without consuming organic molecules derived from other organisms?

Accepted Answer

A) chemotrophs 
B) synthesizers 
C) heterotrophs 
D) autotrophs

Question 16

In photosynthesis,the chemiosmotic production of ATP

Accepted Answer

A) is done by the Calvin cycle. 
B) is analogous to the production of ATP in mitochondria. 
C) is a result of the oxidation of glucose. 
D) requires oxygen.

Question 17

Autotrophs that utilize light as their energy source are

Accepted Answer

A) photoautotrophs. 
B) fungi. 
C) heterotrophs. 
D) chemosynthetic autotrophs.

Question 18

Which of the following photosynthetic pigments can be found at the photosystem reaction center?

Accepted Answer

A) chlorophyll b 
B) chlorophyll a 
C) phycocyanin 
D) a carotenoid

Question 19

What is the likely origin of chloroplasts?

Accepted Answer

A) photosynthetic prokaryotes that lived inside eukaryotic cells 
B) eukaryotes that engulfed photosynthetic fungi 
C) prokaryotes with photosynthetic mitochondria 
D) mitochondria that had a mutation for photosynthesis

Question 20

To produce one glucose,the Calvin cycle needs to be run through time(s).

Accepted Answer

A) eight 
B) six 
C) four 
D) two

Exam 7: Photosynthesis: Using Light to Make Food