Photosynthesis Test (Ch.3)

Question 1

The one thing that all photosynthetic organisms have in common is chlorophyll.

Answer 1

True

Question 2

Light is a form of energy that travels in wave packets called protons.

Answer 2

False

Question 3

During photosynthesis, light energy is transferred to ADP and NADP+, forming ATP and NADPH.

Answer 3

True

Question 4

The reactions of carbon fixation depend on the light reactions to supply ATP and NADPH.

Answer 4

True

Question 5

Most plants are green because that is the color of light they need for photosynthesis.

Answer 5

False

Question 6

The light-saturation point is the light intensity at which the carbon fixation reactions reach a maximum overall rate.

Answer 6

True

Question 7

In comparing respiration and photosynthesis, respiration releases energy while photosynthesis stores energy.

Answer 7

True

Question 8

Land plants get the CO2 they need for photosynthesis mostly from…

Answer 8

the atmosphere

Question 9

Which of the following is not a characteristic of the light reactions?

Answer 9

carbon fixation happens

Question 10

Which of the following statements concerning the Calvin Cycle is true?
I. ATP molecules are needed to keep the reactions going.
II. The process makes NADPH + H+
III. reduction occurs
IV. oxygen is a product
V. photophosphorylation occurs
VI. carbon fixation occurs
VII. takes place in the thylakoids of chloroplasts

Answer 10

I, III, and VI

ATP molecules are needed to keep the reactions going, reduction occurs and carbon fixation occurs

Question 11

Ultimately, the light reactions

Answer 11

form ATP and NADPH + H+

Question 12

When photosynthesis occurs, the oxygen that is released comes from…

Answer 12

water

Question 13

In photosynthesis, the function of water is to

Answer 13

supply free electrons

Question 14

a) The table below summarizes data obtained in an experiment on oxygen released by different plant species grown under different lighting conditions. Assume that the plants are of comparable size.

Plant Type of light V of O2 T Time (days)
Corn Incandescent 200 20 5
Corn Fluorescent 400 22 10
Barley Incandescent 200 22 5
Barley Fluorescent 150 22 5
A fair comparison can only be made on…

b) Which of the following is a reasonable interpretation?

Answer 14

a) barley leaves under both lighting conditions

b) oxygen production is more rapid in barley in incandescent light than fluorescent light.

Question 15

In green plants, respiration takes place

Answer 15

all of the time

Question 16

Photosynthesis takes place within ________ in three stages: a)_______ light energy, b) synthesizing_______ and _________ and c) the _____ cycle. Stages a) and b) comprise the _______ reactions, while carbon dioxide is fixed into carbohydrates in stage c), which can also be referred to as the ______ ________ reactions.

Answer 16

chloroplasts
absorbing 
NADPH and ATP
Calvin
Light
Light Independent

Question 17

Name of the principle light-absorbing pigment in plants.

Answer 17

chlorophyll

Question 18

Cells that regulate gas exchange in plants

Answer 18

guard cells

Question 19

The major cellular site of photosynthesis

Answer 19

chloroplasts

Question 20

Name of the opening that regulates gas exchange in plants

Answer 20

Stomata