Chapter 8

Question 1

Photosynthesis from plants is the fundamental source of food and energy for all other complex life on Earth.

Answer 1

True

Question 2

The reaction for photosynthesis is as follows:

C6H12O6 + 6O2 -> 6CO2 + 6H20 + energy (ATP and heat)

Answer 2

False

Question 3

Many crop plants contain 80-95 percent water.

Answer 3

True

Question 4

Chlorophyll converts chemical energy into light energy.

Answer 4

False

Question 5

Carotenoids are one type of plant pigment.

Answer 5

True

Question 6

ATP and NADPH are produced in the carbon-fixation steps of photosynthesis.

Answer 6

False

Question 7

The light reactions are the only part of photosynthesis that require light.

Answer 7

True

Question 8

One of the functions of transpiration is uptake of mineral nutrients.

Answer 8

True

Question 9

The Krebs cycle is part of photosynthesis.

Answer 9

False

Question 10

Water is absorbed from the soil by root hairs.

Answer 10

True

Question 11

The rate of transpiration increases with higher temperatures.

Answer 11

True

Question 12

Leaf curling can be a sign of moisture stress.

Answer 12

True

Question 13

It is important to recognize crop development stages in order to apply sound management practices.

Answer 13

True

Question 14

The Growing Degree Day base temperature for soybeans is 32 degrees F.

Answer 14

False

Question 15

In which organelle does photosynthesis occur?

Answer 15

Chloroplast

Question 16

Plant pigments absorb visible light in this range:

Answer 16

400-700mm

Question 17

Plant pigments are least effective in absorbing which color of light?

Answer 17

Green

Question 18

The two energy compounds used in the carbon-fixation reactions are:

Answer 18

ATP and NADPH

Question 19

Which type of photosynthesis is inefficient above 25 degrees C?

Answer 19

C3

Question 20

What percentage of the world’s plants are C4?

Answer 20

10

Question 21

Which type of cell controls the opening and closing of stomata?

Answer 21

guard

Question 22

Rhizobia bacteria convert atmospheric nitrogen into:

Answer 22

NH3

Question 23

The plant response that is most important for triggering flowering in the spring is:

Answer 23

vernalization

Question 24

The process by which plants differentiate from seedling to vegetative to flowering would best be described as:

Answer 24

development

Question 25

The index of heat accumulation (or heat units over time) used to estimate how crop development will progress and when a crop is predicted to mature is:

Answer 25

Growing Degree Days