J. A. Milburn and R. P. C. Johnson developed an acoustic method for detecting cavitation in plants. This involves "listening" for characteristic clicks produced during air-bubble formation, using sensitive microphones and amplifiers
In one experiment with the castor bean plant (Ricinus communis), they detached leaves by cutting the petioles and subjected them to various treatments. Which of the following would be LEAST likely to be observed in such an experiment?
A) as the leaf is allowed to wilt, recording many clicks that approximately equal the estimated number of vessel elements in the cut petiole
B) after increasing transpiration by blowing warm air across the leaf, recording an increased rate of clicking
C) after adding water to the cut end of the petiole, recording an increased rate of clicking
Answer: C
You might also like to view...
Syntrophy is an association between two organisms in which
a) one organism gives off antagonistic substances to prevent the growth of the other b) one of the organisms relies on the waste products of the other for energy or nutrients c) they cooperate to break down a nutrient neither could break down alone d) one benefits while the other is harmed
After estimating a probit model for whether an individual purchases a particular product as a function of income, which of the following conditions must hold?
A. The predictions will fall between zero and 1. B. The predictions will sum to zero. C. The intercept will be positive. D. The r-squared will be one.
At an underdominant locus, how will allele frequencies change through time?
a. The homozygote with the greatest fitness advantage will have its allele fixed. b. A balanced polymorphism of both alleles will be maintained at a stable equilibrium. c. The homozygote with the lowest fitness advantage will have its allele lost. d. One or the other allele will be lost depending on their initial frequencies. e. Both alleles will be lost.
The production of leukocytes is regulated by
A. erythropoietin. B. colony-stimulating factor. C. prolactin. D. folic acid. E. rennin.