Many plants wind up with a Na+ concentration that is considerably lower than that of the surrounding
soil. Which of these plays a key role in allowing for such a difference to exist?
a. water potential
b. aquaporins
c. root cap
d. endodermis
e. tonoplast
D
You might also like to view...
How would the phenotypes of progeny differ if a trait was produced from the influence of many genes, compared to a trait caused by a single gene with two alleles and incomplete dominance?
A. They would not differ, and progeny in both would have an array of phenotypes that vary continuously across a range. B. The progeny from the single-gene cross would all be identical, whereas the manygene cross would vary continuously across a spectrum. C. The progeny from the single-gene cross would have three phenotypes, whereas the progeny of the trait caused by many genes would vary continuously across a spectrum.
Several new tetraploid species of a plant called salsify (Tragopogon) known as salsify have arisen in western North America. These new species each arose from a diploid species that went through the process of allopolyploidy. This mode of speciation is a type of ________ and it occurs _______.
A. allopatric speciation; almost instantaneously B. allopatric speciation; very slowly C. sympatric speciation; almost instantaneously D. sympatric speciation; very slowly E. adaptive radiation; very slowly
The carcinogenic compound ____, which damages kidneys and the nervous system, is produced by some strains of Aspergillus flavus.
Fill in the blank(s) with the appropriate word(s).
The worst invasive species brought to Easter Island by the Polynesian settlers was __________.
Fill in the blank(s) with the appropriate word(s).