Allopatric speciation requires
a. accelerated gene flow.
b. physical separation.
c. physical diversity.
d. behavioral diversity.
e. all of these.
Answer: b
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More carbon is present in dead organic material on Earth than in living organisms
Indicate whether the statement is true or false.
Which of the following is the advantage that plants in arid habitats experience when they keep their stoma closed during hot daytime hours?
A. It prevents loss of CO2. B. It helps to conserve water. C. It brings minerals up the plant. D. It prevents sugar transport to the guard cells. E. It gives plants a needed rest.
What is the term for a short section of an underground stem that is encased by overlapping layers of thickened, modified leaves (scales)?
a. corms b. tubers c. bulbs d. stolons e. rhizomes
Choose the letter of the best match from the following:A. abscisic acidB. trichomesC. aquaporinD. endodermisE. stomaPore in plasma membrane that allows water movement.
Fill in the blank(s) with the appropriate word(s).