Which of the following generally causes stomata to open?
a. release of abscisic acid by the roots
b. a drop in CO2 concentration in leaf air spaces
c. exposure to red light
d. a drop in O2 concentration in leaf air spaces
e. an increase in CO2 concentration in the leaf air spaces
B
You might also like to view...
Which statement best summarizes the major distinction between horizontal gene transfer and vertical gene transfer?
A. Genes are more stable in recipient cells following horizontal transfer that in those following vertical transfer. B. The recipient of genes in horizontal transfer is a mature cell, whereas the recipient of genes in vertical transfer is a progeny cell. C. Horizontal transfer is observed in bacteria and archaea, whereas vertical transfer is observed in all cells. D. Organisms that use horizontal transfer can only reproduce asexually, whereas organisms that use vertical transfer can reproduce sexually or asexually.
Genetically altered organisms are ____
a. always genetically modified organisms b. always made using DNA technologies c. only used in basic research d. only used in applied research e. created through natural mutations or by using DNA technologies
Males are often more colorful, larger, and aggressive than females. What is the term for these types of differences between the sexes?
a. male traits b. sexual traits c. sexual dimorphism d. male dominance e. hormonal variance
During swallowing, which structure aids the epiglottis in closing off the trachea?
a. the glottis b. the esophagus c. the vocal cords d. the pharynx e. the soft palate