Deck 5: Photosynthesis

Question 1

The primary pigment molecule needed for photosynthesis is

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

Answer 1

E
Explanation: Chlorophyll a is a green pigment which colors leaves.Please see section 5.2 for more information.

Question 2

Electrons excited in photosystem II help the chloroplast produce

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

Answer 2

E
Explanation: The energy of light captured by Photosytem II is put into the chemical bond energy in ATP.Please see section 5.5 for more information.

Question 3

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

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

Answer 3

A
Explanation: Light arrives for photosynthesis in discrete packets called photons.Please see section 5.1 for more information.

Question 4

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 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

The main byproduct of photosynthesis that is essential to most life forms is

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

Question 7

The energy source for the light reactions is _____;the energy source for the carbon reactions is ______.

A)ATP,carbon dioxide
B)sunlight,carbon dioxide
C)sunlight,ATP
D)ATP,oxygen
E)Sunlight serves as the energy source for both sets of photosynthetic reactions.

Question 8

Which organism's life depends on photosynthesis?

A)corals
B)oak trees
C)humans
D)sea slug Elysia chlorotica
E)All answers are correct.

Question 9

The reactants of photosynthesis are

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

Question 10

The main product of photosynthesis used by plants is

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

Question 11

Organisms that gain energy by consuming preexisting organic molecules are called

A)heterotrophs.
B)autotrophs.
C)animorphs.
D)plants.
E)No answer is correct.

Question 12

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 13

What part of the chloroplast has photosynthetic pigments in its membrane?

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

Question 14

In what organelle does photosynthesis take place in algae and plants?

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

Question 15

The energy source for photosynthesis is

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

Question 16

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

A)carbon dioxide
B)glucose
C)sunlight
D)ATP
E)oxygen

Question 17

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.

Question 18

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

A)animals.
B)animorphs.
C)heterotrophs.
D)autotrophs.

Question 19

The reactions of photosynthesis are summarized as

A)6CO₂ + 6H₂O →C₆H₁₂O₆ + 6O_2.
B)6CO + 6H₂O →C₆H₁₂O₆ + 6H₂O.
C)12CO₂ + 6H₂O →C₁₂H₁₂O₆ + 6H₂O.
D)6CO + 6H₂O →C₆H₁₂O_?6 + 6O_2.
E)No answer is correct.

Question 20

Leaves of many plants change colors in the fall because

A)the cooler weather causes plants to produce more of the accessory photosynthetic 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 accessory photosynthetic pigments.
D)plants produce more chlorophyll.
E)All answers are correct.

Question 21

The sea slug Elysia chlorotica benefits from both light and carbon reactions because it contains

A)enzymes that produce green light.
B)heme.
C)algal chromosomes.
D)pigments that reflect red and blue light.
E)chlorophyll.

Question 22

The Calvin cycle

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

Question 23

Tiny openings in the epidermis of the leaf that allow air to enter into the leaf are called

A)thylakoids.
B)stroma.
C)stomata.
D)grana.
E)thylakoid spaces.

Question 24

Burning wood is a reverse reaction of photosynthesis,so 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 25

In photosynthesis,the oxygen atoms in H₂O are

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

Question 26

Which plants are best suited to cool,wet conditions?

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

Question 27

How do CAM plants minimize photorespiration?

A)The light reactions and carbon reactions occur in different cells,so carbon dioxide does not come into contact with rubisco.
B)The light reactions and 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.

Question 28

The main product of the carbon reactions is

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

Question 29

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 carbon reactions occur in different cells,so carbon dioxide does not come into contact with rubisco.
C)Stomata are open only at night and carbon dioxide is stored in a four-carbon compound.
D)The light reactions and carbon reactions occur in different cells,so oxygen does not come into contact with rubisco.

Question 30

If you were looking to change your work on stomata to suit your awake-at-night personality,with which plants would you choose to work?

A)CAM
B)C₃
C)C₄
D)CAM or C₃
E)C₃ or C₄

Question 31

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

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

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

Question 34

The light reactions provide energy to run the carbon reactions' production of carbohydrate.

Question 35

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

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

Question 36

If you were placing orders for experiments with rubsico,for the first part of your work you would need to get what besides ribulose bisphosphate?

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

Question 37

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 answers are correct.

Question 38

The sea slug Elysia chlorotica absorbs chloroplasts as it digests algae,allowing the sea slug to live on sunlight and carbon dioxide.This suggests that for both light and carbon reactions

A)photosynthesis can occur from proteins released from a digested chloroplast.
B)regions of a plant outside of the chloroplast are necessary for photosynthesis.
C)chloroplasts alone are sufficient for photosynthesis.
D)some of the algae are not digested and are living symbiotically inside of the sea slugs.
E)photosynthesis can occur outside of a chloroplast in algaE.

Question 39

The product of photosystem I is

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

Question 40

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 41

Match the steps of photosynthesis with the correct descriptions.

Question 42

The light reactions harvest _______,while the carbon reactions produce _______.

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

Question 43

The carbon reactions produce ATP and NADPH.

Question 44

Without photosynthesis,autotrophs would be more abundant.

Question 45

Match the reactants of photosynthesis with the correct sources.

Question 46

How would Earth be different without photosynthesis?

A)The amount of oxygen in the atmosphere would be lower.
B)Heterotrophs would have few food sources.
C)Autotrophs would reply on other chemical mechanisms to make carbohydrates.
D)More sunlight would be absorbed and converted to environmental heat.
E)All answers are correct.

Question 47

Without photosynthesis,iron objects would rust slowly or not at all.

Question 48

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

Question 49

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

Question 50

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.

Question 51

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

Question 52

What is a product of reactions that take place at photosystem II?

A)NADPH
B)water
C)oxygen
D)ADP
E)glucose

Question 53

C₄ plants and CAM plants fix carbon in a larger molecule twice during photosynthetic reactions.

Question 54

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

Question 55

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 56

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

A)leaves
B)bark
C)roots
D)stems
E)No answer is correct.

Question 57

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

Question 58

Water interacts with the machinery of photosynthesis at photosystem II.

Question 59

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 60

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

Question 61

Place the steps of the light reactions in the order in which they occur.