RNR230R - Exam 1 Questions With Complete Answers
Leaf and stem trichomes increase the depth of the boundary layer. How does this affect rates
of transpiration? - ANSWER It reduces the amount of air flow near the leaf and stems, making
it less likely that wet air will be displaced by dry air and lower the water potential of the air
near the leaf/stem. This reduces rates of transpiration.
Guard cells are responsible for controlling the intake of molecules of _____________ which are
required for the ______________ reactions of photosynthesis to occur. The activities of these cells
also affect evaporation of water from the plant through a process known as ____________ -
ANSWER 1. Carbon Dioxide (CO2)
2. carbon fixation
3. transpiration
CAM and C4 photosynthesis are thought to have evolved to allow plants to survive in
environments that are on average ________________ and _______________ than is typical for
environments where plants with ____________ photosynthesis are most common. - ANSWER 1.
hot
2. arid
3. C3
Explain the plant-growth compromise that is associated with drought deciduousness as a
strategy to achieve drought resistance - ANSWER plants with drought deciduousness undergo
a seasonal shedding of leaves during drought (dry) periods and then regrow these leaves
, during wet periods.
This regrowth/shedding cycle allows these plants to persist during times of drought, but also
uses a lot of energy and causes the plant's overall growth to be generally slow.
Additionally, unpredictable drought/precipitation periods can lead to missed opportunities of
photosynthesis (leaves) and reproduction (flowers)
divisions of the vascular cambium produce primarily two types of cells: __________ toward the
outside of the stem or root and ____________ toward the inside - ANSWER 1. secondary phloem
2. secondary xylem
The most obvious difference between plant and animal cells is that the former exhibits mostly
rigid structure, the __________ __________ that the latter do not. ___________ represents the
material from which this structure is built - ANSWER 1. cell walls
2. Cellulose
In what structure within plant cells do the chemical reactions of photosynthesis occur? -
ANSWER chloroplasts (thylakoid membranes, stroma)
what are the 3 basic inputs required by the chemical reactions for photosynthesis? - ANSWER
light energy, carbon dioxide, and water
what are the 2 ultimate products of the chemical reactions in photosynthesis? - ANSWER
glucose and oxygen
Leaf and stem trichomes increase the depth of the boundary layer. How does this affect rates
of transpiration? - ANSWER It reduces the amount of air flow near the leaf and stems, making
it less likely that wet air will be displaced by dry air and lower the water potential of the air
near the leaf/stem. This reduces rates of transpiration.
Guard cells are responsible for controlling the intake of molecules of _____________ which are
required for the ______________ reactions of photosynthesis to occur. The activities of these cells
also affect evaporation of water from the plant through a process known as ____________ -
ANSWER 1. Carbon Dioxide (CO2)
2. carbon fixation
3. transpiration
CAM and C4 photosynthesis are thought to have evolved to allow plants to survive in
environments that are on average ________________ and _______________ than is typical for
environments where plants with ____________ photosynthesis are most common. - ANSWER 1.
hot
2. arid
3. C3
Explain the plant-growth compromise that is associated with drought deciduousness as a
strategy to achieve drought resistance - ANSWER plants with drought deciduousness undergo
a seasonal shedding of leaves during drought (dry) periods and then regrow these leaves
, during wet periods.
This regrowth/shedding cycle allows these plants to persist during times of drought, but also
uses a lot of energy and causes the plant's overall growth to be generally slow.
Additionally, unpredictable drought/precipitation periods can lead to missed opportunities of
photosynthesis (leaves) and reproduction (flowers)
divisions of the vascular cambium produce primarily two types of cells: __________ toward the
outside of the stem or root and ____________ toward the inside - ANSWER 1. secondary phloem
2. secondary xylem
The most obvious difference between plant and animal cells is that the former exhibits mostly
rigid structure, the __________ __________ that the latter do not. ___________ represents the
material from which this structure is built - ANSWER 1. cell walls
2. Cellulose
In what structure within plant cells do the chemical reactions of photosynthesis occur? -
ANSWER chloroplasts (thylakoid membranes, stroma)
what are the 3 basic inputs required by the chemical reactions for photosynthesis? - ANSWER
light energy, carbon dioxide, and water
what are the 2 ultimate products of the chemical reactions in photosynthesis? - ANSWER
glucose and oxygen
