Production of the lignin molecule in xylem cells is an adaptation that gives vascular plants the ability to
A. promote active transport pumping of water and nutrients in each cell.
B. grow tall and form branches.
C. reduce water loss to the atmosphere.
D. All of the answer choices are correct.
E. transport sugars produced in photosynthesis.
B. grow tall and form branches.
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A house plant seems to be growing slowly and lacks its normal bright green color. You call a botanist for advice. She suggests that the plant may be deficient in magnesium (Mg2+). Why are these symptoms associated with Mg2+ deficiency?
A) Mg2+ is important in the structure of many amino acids. B) Lack of Mg2+ in the soil allows pathogenic bacteria to grow. C) Mg2+ is required before NADPH can function. D) Mg2+ is an important component in chlorophyll. E) Cytochromes require Mg2+ to function properly.
During the initiation of nitrogen-fixation nodules, how do the Rhizobium bacteria enter into the cortex of the root?
A. through the plasmadesmata of the root hairs B. via the apoplastic pathway C. using proton pumps D. through a membrane tube called an infection thread E. by repeated cell divisions
Which statement is not true about the rod cells? a. Detect dim light
b. Least abundant photoreceptor. c. Contain the pigment rhodopsin. d. Respond to changes in light intensity. e. Most abundant photoreceptor.
Which type of vessel offers the most resistance to blood flow?
a. artery b. arteriole c. capillary d. venule e. vein