WSU BIOLOGY 106 EXAM 2 MOCK TEST WITH
ANSWER RATIONALES 2026
◉ what's the role od Cation exchange in making minerals available
to the roots.
Answer: cation are + and clay is -, they have to send out H+ from the
roots so that the plant can take in the nutrients that are stuck on the
clay particles.
◉ what do the rhizobacteria do that help enhance plant growth..
Answer: they produce chemicals that stimulate growth, produce
antibiotics that protect roots, can make more nutrients available.
◉ what do nitrogen fixing bacteria do that supply plants with N.
Answer: they change N2 (atmospheric N) into N3 so that the plants
can use it.
◉ whats the significance of a root nodule?.
Answer: they contain the N fixing bacteria
◉ what do plants get and what do bacteria fungi plant nutrition get?.
Answer: plants- get fixed N
, fungi- gets carbohydrates and other organic compounds
◉ how does mycorrhizae help the plant?.
Answer: the plant gets increased area for H2O and phosphorus,
secretes growth hormone that stimulate the roots as well as
protecting the roots.
◉ how does ectomycorrhiza and endomycorrhizal differ.
Answer: ectomycorrhiza - the dense sheath of mycelia over the
surface of the root doesn't cause an invitation to the host
endomycorrhizal- fungs with a plant root system in which the
fungus causes the invagination of the host
◉ what does heterotroph mean?.
Answer: they cant produce there own food
◉ what is the hyphae made of.
Answer: chitin
◉ Why are fungi important to the physical environment?.
Answer: they can break down rock so plants can live there
◉ what is a good example of fungus-plant mutualism.
ANSWER RATIONALES 2026
◉ what's the role od Cation exchange in making minerals available
to the roots.
Answer: cation are + and clay is -, they have to send out H+ from the
roots so that the plant can take in the nutrients that are stuck on the
clay particles.
◉ what do the rhizobacteria do that help enhance plant growth..
Answer: they produce chemicals that stimulate growth, produce
antibiotics that protect roots, can make more nutrients available.
◉ what do nitrogen fixing bacteria do that supply plants with N.
Answer: they change N2 (atmospheric N) into N3 so that the plants
can use it.
◉ whats the significance of a root nodule?.
Answer: they contain the N fixing bacteria
◉ what do plants get and what do bacteria fungi plant nutrition get?.
Answer: plants- get fixed N
, fungi- gets carbohydrates and other organic compounds
◉ how does mycorrhizae help the plant?.
Answer: the plant gets increased area for H2O and phosphorus,
secretes growth hormone that stimulate the roots as well as
protecting the roots.
◉ how does ectomycorrhiza and endomycorrhizal differ.
Answer: ectomycorrhiza - the dense sheath of mycelia over the
surface of the root doesn't cause an invitation to the host
endomycorrhizal- fungs with a plant root system in which the
fungus causes the invagination of the host
◉ what does heterotroph mean?.
Answer: they cant produce there own food
◉ what is the hyphae made of.
Answer: chitin
◉ Why are fungi important to the physical environment?.
Answer: they can break down rock so plants can live there
◉ what is a good example of fungus-plant mutualism.
