BIOL 1108
BIOL 1108 Exam 3 Study Questions
and Answers Graded A+ 2026
sonoran desert location -Correct Answer ✔-us southwest and nw mexico
conditions for plants in the sonoran desert -Correct Answer ✔-summer is too hot (95ᵒF)
spring is too dry
winter is the only good growing season for many plants, especially annuals
what are annuals? -Correct Answer ✔-germinate, grow, set seed and die in a single
growing season
what percent of the earth's biomass do plants make up? -Correct Answer ✔-plants: 80%
bacteria: 13%
fungus: 2%
animals : 0.36%
archaea: 1.3%
what molecule (not atom) makes up most of plant's biomass? -Correct Answer ✔-
cellulose
van helmont's experiment -Correct Answer ✔-watered a plant for 5 years, determined
that water was important for plants to grow in size but that soil is not involved in mass
growth
what plant organ obtains water? -Correct Answer ✔-roots
parts of a plant -Correct Answer ✔-
what plant organ creates or obtains carbon/sugar? -Correct Answer ✔-leaves
what plant organ collects light? -Correct Answer ✔-leaves
if you want to be able to grow fast (cellulose), where should you allocate resources? -
Correct Answer ✔-leaves
where does water usually leave a plant? -Correct Answer ✔-leaves (stomata)
if dry, where do you want to allocate resources? -Correct Answer ✔-roots
BIOL 1108
, BIOL 1108
if there are a lot of plants growing around you, where do you want to allocate resources
to win in the short term? -Correct Answer ✔-leaves/stem for light
what do plant need water? -Correct Answer ✔-photosynthesis reactant
structure
moving nutrients
what is basic reaction for photosynthesis? -Correct Answer ✔-H2O + CO2 + light -->
C2H12O6 (glucose) + O2
what is basic reaction for respiration? -Correct Answer ✔-O2 + glucose --> H2O + CO2
+ ATP
diffusion -Correct Answer ✔-the passive movement of molecules from high to low conc.
to establish an equilibrium
both solute and solvent move
osmosis -Correct Answer ✔-a process by which water molecules pass through a
semipermeable membrane from a less concentrated[more dilute] solution into a more
concentrated one, thus equalizing the concentrations on each side of the membrane
water potential -Correct Answer ✔-the physical property predicting the direction in which
water will flow, governed by solute concentration and applied pressure
water moves to lower water potentials (since the water potential of pure water is 0, this
often means moving to more negative water potentials)
turgid cell -Correct Answer ✔-water enters by osmosis
vacuole swells and pushes against cell wall
flaccid cell -Correct Answer ✔-water lost from cell
vacuole shrinks and cell loses shape
what are the vascular tissues in plants? -Correct Answer ✔-xylem and phloem
pholem -Correct Answer ✔-carries dissolved nutrients, hormones, sugars, etc. around a
plant in any direction - using osmosis
BIOL 1108
BIOL 1108 Exam 3 Study Questions
and Answers Graded A+ 2026
sonoran desert location -Correct Answer ✔-us southwest and nw mexico
conditions for plants in the sonoran desert -Correct Answer ✔-summer is too hot (95ᵒF)
spring is too dry
winter is the only good growing season for many plants, especially annuals
what are annuals? -Correct Answer ✔-germinate, grow, set seed and die in a single
growing season
what percent of the earth's biomass do plants make up? -Correct Answer ✔-plants: 80%
bacteria: 13%
fungus: 2%
animals : 0.36%
archaea: 1.3%
what molecule (not atom) makes up most of plant's biomass? -Correct Answer ✔-
cellulose
van helmont's experiment -Correct Answer ✔-watered a plant for 5 years, determined
that water was important for plants to grow in size but that soil is not involved in mass
growth
what plant organ obtains water? -Correct Answer ✔-roots
parts of a plant -Correct Answer ✔-
what plant organ creates or obtains carbon/sugar? -Correct Answer ✔-leaves
what plant organ collects light? -Correct Answer ✔-leaves
if you want to be able to grow fast (cellulose), where should you allocate resources? -
Correct Answer ✔-leaves
where does water usually leave a plant? -Correct Answer ✔-leaves (stomata)
if dry, where do you want to allocate resources? -Correct Answer ✔-roots
BIOL 1108
, BIOL 1108
if there are a lot of plants growing around you, where do you want to allocate resources
to win in the short term? -Correct Answer ✔-leaves/stem for light
what do plant need water? -Correct Answer ✔-photosynthesis reactant
structure
moving nutrients
what is basic reaction for photosynthesis? -Correct Answer ✔-H2O + CO2 + light -->
C2H12O6 (glucose) + O2
what is basic reaction for respiration? -Correct Answer ✔-O2 + glucose --> H2O + CO2
+ ATP
diffusion -Correct Answer ✔-the passive movement of molecules from high to low conc.
to establish an equilibrium
both solute and solvent move
osmosis -Correct Answer ✔-a process by which water molecules pass through a
semipermeable membrane from a less concentrated[more dilute] solution into a more
concentrated one, thus equalizing the concentrations on each side of the membrane
water potential -Correct Answer ✔-the physical property predicting the direction in which
water will flow, governed by solute concentration and applied pressure
water moves to lower water potentials (since the water potential of pure water is 0, this
often means moving to more negative water potentials)
turgid cell -Correct Answer ✔-water enters by osmosis
vacuole swells and pushes against cell wall
flaccid cell -Correct Answer ✔-water lost from cell
vacuole shrinks and cell loses shape
what are the vascular tissues in plants? -Correct Answer ✔-xylem and phloem
pholem -Correct Answer ✔-carries dissolved nutrients, hormones, sugars, etc. around a
plant in any direction - using osmosis
BIOL 1108
