Chapter 8 Flashcards
Photosynthesis from plants is the fundamental source of food and energy for all other complex life on Earth.
True
The reaction for photosynthesis is as follows:
C6H12O6 + 6O2 -> 6CO2 + 6H20 + energy (ATP and heat)
False
Many crop plants contain 80-95 percent water.
True
Chlorophyll converts chemical energy into light energy.
False
Carotenoids are one type of plant pigment.
True
ATP and NADPH are produced in the carbon-fixation steps of photosynthesis.
False
The light reactions are the only part of photosynthesis that require light.
True
One of the functions of transpiration is uptake of mineral nutrients.
True
The Krebs cycle is part of photosynthesis.
False
Water is absorbed from the soil by root hairs.
True
The rate of transpiration increases with higher temperatures.
True
Leaf curling can be a sign of moisture stress.
True
It is important to recognize crop development stages in order to apply sound management practices.
True
The Growing Degree Day base temperature for soybeans is 32 degrees F.
False
In which organelle does photosynthesis occur?
Chloroplast
Plant pigments absorb visible light in this range:
400-700mm
Plant pigments are least effective in absorbing which color of light?
Green
The two energy compounds used in the carbon-fixation reactions are:
ATP and NADPH
Which type of photosynthesis is inefficient above 25 degrees C?
C3
What percentage of the world’s plants are C4?
10
Which type of cell controls the opening and closing of stomata?
guard
Rhizobia bacteria convert atmospheric nitrogen into:
NH3
The plant response that is most important for triggering flowering in the spring is:
vernalization
The process by which plants differentiate from seedling to vegetative to flowering would best be described as:
development
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:
Growing Degree Days
