Biology 1108- Exam 2- Susan Herrick Updated Exam 2026
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What are the 3 functions of a leaf? - ANSWERS-gas exchange
photosynthesis
transpiration
Why does CO2 uptake in leaves depend of the plants water supply? - ANSWERS-
gradients
What is the purpose of columnar arrangement near the upper surface of a leaf? -
ANSWERS-maximized light interception
What is the purpose of mesophyll cells? - ANSWERS-spread CO2 throughout the leaf
How do guard cells work? - ANSWERS-when water escapes the cells, they shrink,
causing the stomata to open. once the cell fills with water, it will swell, causing the
stomata too close.
Why would a leaf need to control the opening to the leaf tissue? - ANSWERS-minimize
water loss
What is CAM photosynthesis? - ANSWERS-Stomata open at night to collect CO2, it is
stored for photosynthesis usage during the day.
What plants use CAM photosynthesis? - ANSWERS-plants that are adapted to
humid/tropical environments (cacti, pineapple)
, Why do some plants use CAM photosynthesis? - ANSWERS-to minimize
photorespiration
Drawback of using CAM photosynthesis? - ANSWERS-more energy usage
Why is C4 PSN more efficient than C3 PSN? - ANSWERS-less photorespiration
What is the purpose of the xylem in a leaf? - ANSWERS-replaces water that evaporated
from the leaves with water pulled up from the soil
What major challenge for photosynthesis did land plants face during evolution? -
ANSWERS-How to get enough CO2 without drying out
What are the two branches of land plants? - ANSWERS-bryophytes
vascular plants
What are the 4 major groups of vascular plants? - ANSWERS-lycophytes
ferns & horsetails
gymnosperms
angiosperms
What are the two main structures on the surface of a leaf? - ANSWERS-cuticle
stomata
The cuticle and stomata help in regulating CO2 ______ and water ______. (gain or
loss) - ANSWERS-gain, loss
WITH Recent Newest Verified And Well Analyzed Exam
Questions (Actual Exam 2026-2027) Correct Detailed &
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Pass!!
What are the 3 functions of a leaf? - ANSWERS-gas exchange
photosynthesis
transpiration
Why does CO2 uptake in leaves depend of the plants water supply? - ANSWERS-
gradients
What is the purpose of columnar arrangement near the upper surface of a leaf? -
ANSWERS-maximized light interception
What is the purpose of mesophyll cells? - ANSWERS-spread CO2 throughout the leaf
How do guard cells work? - ANSWERS-when water escapes the cells, they shrink,
causing the stomata to open. once the cell fills with water, it will swell, causing the
stomata too close.
Why would a leaf need to control the opening to the leaf tissue? - ANSWERS-minimize
water loss
What is CAM photosynthesis? - ANSWERS-Stomata open at night to collect CO2, it is
stored for photosynthesis usage during the day.
What plants use CAM photosynthesis? - ANSWERS-plants that are adapted to
humid/tropical environments (cacti, pineapple)
, Why do some plants use CAM photosynthesis? - ANSWERS-to minimize
photorespiration
Drawback of using CAM photosynthesis? - ANSWERS-more energy usage
Why is C4 PSN more efficient than C3 PSN? - ANSWERS-less photorespiration
What is the purpose of the xylem in a leaf? - ANSWERS-replaces water that evaporated
from the leaves with water pulled up from the soil
What major challenge for photosynthesis did land plants face during evolution? -
ANSWERS-How to get enough CO2 without drying out
What are the two branches of land plants? - ANSWERS-bryophytes
vascular plants
What are the 4 major groups of vascular plants? - ANSWERS-lycophytes
ferns & horsetails
gymnosperms
angiosperms
What are the two main structures on the surface of a leaf? - ANSWERS-cuticle
stomata
The cuticle and stomata help in regulating CO2 ______ and water ______. (gain or
loss) - ANSWERS-gain, loss
