Which statement is false?
a. The stomata open simply to allow carbon
dioxide to enter the leaf, not as a result of
environmental conditions.
b. As carbon dioxide levels drop in guard cells,
there is an influx of potassium.
c. When potassium ions enter guard cells, water
moves into the guard cells by osmosis.
d. At night, in most plants carbon dioxide builds up
in guard cells, resulting in the movement of
potassium and water out of the guard cells.
e. When the guard cells shrivel, the stomata are
closed.
Answer: a
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Sponges move huge volumes of water through their bodies every day
Although this serves the function of filter feeding for the organism, how might this also provide an "ecosystem" service (something that affects and/or benefits other organisms in their environment)? A. They can filter small poisonous fish out of the water that may harm other organisms. B. They create small currents in their microenvironment that help to circulate and clean water locally for other organisms. C. They produce large numbers of gametes that will become food for other sponges.d. Their body chambers serve as places where smaller organisms can live and be protected from certain predators.
Four of the following were innovations that led to new adaptive zones. Select the exception
a. flight-capable wings in birds b. amniotic eggs in early reptiles c. Galápagos finches evolved to eat differently sized seeds d. sperm cells carried in pollen grains in seed plants e. silk glands in spiders
Mesoderm gives rise to all of the following
except
a. the muscular system. b. the circulatory system. c. the reproductive system. d. the nervous system. e. the excretory system.
In a test cross, a pure-breeding plant is crossed with a plant suspected to be heterozygous (Aa). What is the genotype of the pure-breeding plant?
What will be an ideal response?