BIO 152 EXAM 4 UKY JONES WITH
CORRECT ANSWERS 2025
What is transpiration? correct answers >> The loss of water
vapor through the stomata of leaves.
What is the lumen? correct answers >> inside tubular space
of thylakoids
What is the cuticle correct answers >> a waxy covering of
the epidermis
what is the stoma? correct answers >> opening in leaves
that allows for gas exchange, controlled by guard cells
What is photorespiration? correct answers >> When RuBisCo
binds to oxygen instead of carbon dioxide. Opposite of
photosynthesis.
epidermis correct answers >> skin under cuticle of leaves
palisade mesophyll correct answers >> Layer of tall, column-
shaped mesophyll cells just under the upper epidermis of a leaf.
column shape lets in more light
spongy mesophyll correct answers >> lower layer of loose
tissue in leaf; has many air spaces between its cells
, Difference in conc. gradient between CO2 and H2O correct
answers >> conc. difference driving CO2 into leaf is 100x
smaller than that driving H2O vapor out
What closes guard celles? correct answers >> darkness,
drought, cold, pathogens, ABA hormone
What opens guard cells? correct answers >> light, low CO2
inside, Auxin
Where does the dry weight in a plant come from? correct
answers >> air
How do guard cells work? correct answers >> When needed
to open, ions are pumped into guard cells, water follows in which
swells cells and the pressure opens stoma. When needed to close,
ions low out, followed by water and decreased pressure closes
stoma.
What are the two parts of photosynthesis? correct answers >>
light reactions and calvin cycle
Light reactions correct answers >> requires light energy
Makes ATP & NADPH
Releases O2 (PART THAT USES WATER)
Calvin Cycle correct answers >> (synthesis)
CORRECT ANSWERS 2025
What is transpiration? correct answers >> The loss of water
vapor through the stomata of leaves.
What is the lumen? correct answers >> inside tubular space
of thylakoids
What is the cuticle correct answers >> a waxy covering of
the epidermis
what is the stoma? correct answers >> opening in leaves
that allows for gas exchange, controlled by guard cells
What is photorespiration? correct answers >> When RuBisCo
binds to oxygen instead of carbon dioxide. Opposite of
photosynthesis.
epidermis correct answers >> skin under cuticle of leaves
palisade mesophyll correct answers >> Layer of tall, column-
shaped mesophyll cells just under the upper epidermis of a leaf.
column shape lets in more light
spongy mesophyll correct answers >> lower layer of loose
tissue in leaf; has many air spaces between its cells
, Difference in conc. gradient between CO2 and H2O correct
answers >> conc. difference driving CO2 into leaf is 100x
smaller than that driving H2O vapor out
What closes guard celles? correct answers >> darkness,
drought, cold, pathogens, ABA hormone
What opens guard cells? correct answers >> light, low CO2
inside, Auxin
Where does the dry weight in a plant come from? correct
answers >> air
How do guard cells work? correct answers >> When needed
to open, ions are pumped into guard cells, water follows in which
swells cells and the pressure opens stoma. When needed to close,
ions low out, followed by water and decreased pressure closes
stoma.
What are the two parts of photosynthesis? correct answers >>
light reactions and calvin cycle
Light reactions correct answers >> requires light energy
Makes ATP & NADPH
Releases O2 (PART THAT USES WATER)
Calvin Cycle correct answers >> (synthesis)
