Deck 5: Photosynthesis

Question 1

Of the following organisms,which one does not use photosynthesis to convert CO₂ and water into glucose?

A) algae
B) oak trees
C) humans
D) some bacteria
E) a flowering plant

Answer 1

C
Explanation:

Question 2

What is released at each step of an electron transport chain?

A) ultraviolet wavelengths
B) electrons
C) photons
D) energy
E) All answers are correct.

Answer 2

D
Explanation: The electron transport chain extracts energy in a stepwise fashion.

Question 3

The main product of photosynthesis used by plants for food is

A) glucose.
B) oxygen.
C) carbon dioxide.
D) chlorophyll.
E) sunlight.

Answer 3

A

Question 4

The primary pigment molecule needed for photosynthesis is

A) sunlight.
B) oxygen.
C) carbon dioxide.
D) glucose.
E) chlorophyll a.

Question 5

What is the gelatinous matrix inside chloroplasts that contains ribosomes,DNA,and enzymes?

A) granum
B) chlorophyll
C) thylakoid
D) stroma
E) mitochondria

Question 6

Reactants in a chemical reaction are the molecules that are assembled together or broken down to form products.The reactants in photosynthesis are 

A) oxygen and glucose.
B) water and carbon dioxide.
C) chlorophyll and oxygen.
D) glucose and water.
E) glucose and oxygen.

Question 7

The energy source for photosynthesis is

A) oxygen.
B) sunlight.
C) carbon dioxide.
D) chlorophyll.
E) glucose.

Question 8

Electrons excited in photosystem II help the chloroplast produce

A) water.
B) NADPH.
C) glucose.
D) NADH.
E) ATP.

Question 9

In algae and plants,photosynthesis takes place in the

A) chloroplast.
B) mitochondrion.
C) ribosome.
D) nucleus.
E) lysosome.

Question 10

Organisms that gain energy by consuming preexisting organic molecules are called

A) heterotrophs.
B) autotrophs.
C) animorphs.
D) plants.
E) None of the answer choices are correct.

Question 11

Sunlight is the energy source for the light reactions.The energy sources for the carbon reactions are

A) ATP and carbon dioxide.
B) NADPH and carbon dioxide.
C) NADPH and ATP.
D) ATP and oxygen.
E) NADPH and oxygen.

Question 12

Which does not usually increase in overall abundance as a result of photosynthesis?

A) nitrogen
B) glucose
C) sunlight
D) ATP
E) oxygen

Question 13

Photosynthesis

A) is not dependent on chlorophyll.
B) does not involve oxidation-reduction reactions.
C) produces water and carbon dioxide.
D) produces glucose and oxygen.
E) No answer is correct.

Question 14

Leaves of many plants change colors in the fall because

A) the cooler weather causes plants to produce more of the photosynthetic accessory pigments.
B) chlorophyll in the leaves degrades with shorter days and cooler temperatures.
C) the decrease in daylight hours causes the plant to produce more of the photosynthetic accessory pigments.
D) the plants produce more chlorophyll.
E) All of the answer choices are correct.

Question 15

The ________,in the chloroplast,contains photosynthetic pigments in its membrane.

A) granum
B) mesophyll
C) chlorophyll
D) thylakoid
E) stroma

Question 16

The reactions of photosynthesis are summarized as

A) 6CO₂ + 6H₂O C₆H₁₂O₆ + 6O₂.
B) 6CO + 6H₂O C₆H₁₂O₆ + 6H₂O. 
C) 12CO₂ + 6H₂O C₁₂H₁₂O₆ + 6H₂O. 
D) 6CO + 6H₂O C₆H₁₂O₆ + 6O₂. 
E) No answer is correct.

Question 17

Examples of photosynthetic accessory pigments are

A) chlorophyll b and carotenoids.
B) chlorophyll a and carotenoids.
C) chlorophyll a and chlorophyll b.
D) carotenoids and DNA.
E) chlorophyll b and DNA.

Question 18

If you were asked to sort cards into drawers,a drawer marked "Packets of Light" would receive cards referring to 

A) photons.
B) protons.
C) electrons.
D) lasers.
E) grana.

Question 19

Organisms that make their own organic compounds from inorganic substances are called

A) animals.
B) animorphs.
C) heterotrophs.
D) autotrophs.
E) None of the answer choices are correct.

Question 20

Photosynthesis provides ________ in the atmosphere that support(s)much of the life on earth.

A) organic compounds
B) carbon dioxide
C) chlorophyll
D) oxygen
E) sunlight

Question 21

The carbon reactions produce NADPH,while the light reactions consume it.

Question 22

If you were placing orders for experiments with rubisco,you would need ribulose bisphosphate and what other molecule to conduct the experiments?

A) glucose
B) ATP
C) carbon monoxide
D) organic compounds
E) carbon dioxide

Question 23

Which of the following occurs as a result of splitting a water molecule in photosystem II?

A) O₂ is produced that can be released by the cell.
B) O₂ is produced that can be used by the plant in respiration.
C) Protons are released to assist in the electron transport chain.
D) Electrons are released to assist in the electron transport chain.
E) All answer choices are correct.

Question 24

Herbicides may kill plants by

A) blocking carotenoid synthesis.
B) blocking electron flow in photosystem II.
C) diverting electrons away from photosystem I.
D) interfering with amino acid synthesis.
E) All of the answer choices are correct.

Question 25

The light reactions produce ATP,while the carbon reactions consume it.

Question 26

The Calvin cycle is a 

A) cyclic pathway that produces three-carbon carbohydrates from CO₂.
B) linear pathway that produces three-carbon carbohydrates from CO₂.
C) cyclic pathway that produces ATP and NADPH.
D) linear pathway that produces ATP and NADPH.
E) cyclic pathway that produces ATP and three-carbon carbohydrates from CO₂.

Question 27

The main product of the carbon reactions is

A) oxygen.
B) NADPH.
C) carbon dioxide.
D) a carbohydrate.
E) ATP.

Question 28

The carbon reactions can run on their own without the products of the light reactions.

Question 29

The light reactions provide energy to fuel the carbon reactions to produce carbohydrates. 

Question 30

Tiny openings in the epidermis of the leaf that allow plants to exchange gases with the atmosphere are called

A) thylakoids.
B) pigments.
C) stomata (singular: stoma).
D) grana (singular: granum).
E) thylakoid spaces.

Question 31

How do CAM plants minimize photorespiration?

A) The light reactions and the carbon reactions occur in different cells, so carbon dioxide does not come into contact with rubisco.
B) The light reactions and the carbon reactions occur in different cells, so oxygen does not come into contact with rubisco.
C) Stomata are open only at night and oxygen is stored in a four-carbon compound. During the day the carbon dioxide is released for photosynthesis.
D) Stomata are open only at night and carbon dioxide is stored in a four-carbon compound. During the day the carbon dioxide is released for photosynthesis.
E) None of the answer choices are correct.

Question 32

Photosystem I and photosystem II are part of

A) the light reactions and the carbon reactions.
B) the light reactions only.
C) the light reactions and respiration.
D) the carbon reactions only.
E) respiration.

Question 33

How do C₄ plants minimize photorespiration?

A) Stomata are open only at night and oxygen is stored in a four-carbon compound.
B) The light reactions and the carbon reactions occur in different cells, so CO₂ does not come into contact with rubisco.
C) Stomata are open only at night and CO₂ is stored in a four-carbon compound.
D) The light reactions and the carbon reactions occur in different cells, so that high levels of CO₂ are always around rubisco.
E) None of the answer choices are correct.

Question 34

In photosynthesis,the oxygen atoms in H₂O are

A) energized.
B) reduced.
C) reformed into other elements.
D) oxidized.
E) broken down.

Question 35

Which plants are best suited to cool,wet conditions?

A) C₄
B) C₃
C) CAM
D) All types are equally suited.

Question 36

If you were conducting research on the functioning of a stoma (plural: stomata)to suit your awake-at-night personality,with which plants would you choose to work?

A) CAM
B) C?
C) C?
D) CAM or C?
E) C? or C?

Question 37

In photosynthesis,the carbon in CO₂ is ________ to form glucose.

A) respired
B) oxidized
C) reduced
D) energized
E) broken down

Question 38

The carbon atoms in the cellulose of a wood log originally came from ________ absorbed by the plant.

A) glucose
B) carbon dioxide
C) nutrients in the soil
D) water
E) oxygen

Question 39

The product of photosystem I is

A) NADPH.
B) ATP.
C) glucose.
D) water.
E) NADH.

Question 40

Burning wood is a reverse reaction of photosynthesis.Knowing this,what products would be formed?

A) carbon dioxide and water
B) glucose and oxygen
C) oxygen and carbon dioxide
D) oxygen and water
E) carbon dioxide and glucose

Question 41

For many plants to grow well in hot,dry weather,they must be watered so their stomata will remain open for longer periods of time to let in oxygen.

Question 42

Rubisco catalyzes the fixation of CO₂ with ribulose bisphosphate in the first step of the Calvin cycle.

Question 43

The light reactions harvest _____,while the carbon reactions produce ________.

A) energy; carbohydrates
B) energy; phosphate
C) phosphate; carbohydrates
D) energy; nucleic acids
E) lipids; nucleic acids

Question 44

Plants need water to fill their cells and to perform the light reactions.

Question 45

Without photosynthesis,autotrophs would be more abundant.

Question 46

Most biologists agree that the light reactions are less important than the carbon reactions.

Question 47

What is produced in the light reactions that is used in the carbon reactions of photosynthesis?

A) ATP and NADPH
B) ADP and NADP⁺
C) carbon dioxide and oxygen
D) water and glucose
E) oxygen and glucose

Question 48

Place the steps of the light reactions in the order in which they occur.
________ Excited electrons are passed through electron transport chain,producing NADPH.
________ Photosystem II captures a photon of light.
________ A pair of electrons is excited in the reaction center of photosystem II.
________ Energy is passed to the reaction center of photosystem II.
________ Excited electrons are passed through electron transport chain,producing ATP.

Question 49

If oxygen could be traced,the oxygen in the water in a leaf would end up in carbohydrates after photosynthesis.

Question 50

Biologists consider photosynthesis to be the most important metabolic process because without it,there would be no CO₂ in the atmosphere.

Question 51

If you were planning to extract chlorophyll from an oak tree,what would be the best starting material?

A) leaves
B) bark
C) roots
D) stems
E) None of the answer choices are correct.

Question 52

How would Earth be different without photosynthesis?

A) The amount of oxygen in the atmosphere would be lower.
B) Heterotrophs would have fewer food sources.
C) There would be destruction to the food web.
D) More sunlight would be absorbed and converted to environmental heat.
E) All answers are correct.

Question 53

Water interacts with the machinery in photosystem II during the photosynthesis.

Question 54

Electrons from water are used to replenish those removed from chlorophyll during the light reactions.

Question 55

Why are accessory pigments necessary in photosystems?

A) They capture a wider spectrum of wavelengths of light.
B) They donate electrons to the reaction center.
C) They split water into hydrogen ions and oxygen.
D) They conduct the carbon reactions of photosynthesis.
E) All of the answer choices are correct.

Question 56

The carbon reactions produce ATP and NADPH.

Question 57

Green and yellow wavelengths of light are used to power photosynthesis.