Plant activities that follow a biological clock so that they are based on cycles of about 24 hours are ____
a. gravitropisms
b. photoperiodisms
c. thigmotropisms
d. circadian rhythms
e. phototropisms
ANSWER: d
You might also like to view...
The cytoplasmic domains of immunoglobulins and TCRs have cytoplasmic tyrosines that can be phosphorylated
Indicate whether the statement is true or false.
Which of the following is/are true of the sheath of Leptothrix?
A. May contain ferric and manganic oxides B. Helps protect against microbial predators C. Attaches bacteria to surfaces D. All of the choices are correct.
In several studies of plant responses to elevated CO2 concentrations in the atmosphere, scientists often found that the stimulation of growth gradually diminished because
A. more photorespiration occurred. B. C3 plants were replaced with C4 plants. C. the soil did not contain sufficient nitrogen and other nutrients to support the enhanced growth. D. the plants could not store the extra biomass. E. weedy plants took over the experimental plots.
A group of individuals that can interbreed in nature and produce viable offspring would be considered to be a species according to the
A. general lineage concept. B. evolutionary species concept. C. biological species concept. D. ecological species concept. E. phylogenetic species concept.