What is the role of the endodermis in nutrient absorption? What will be an ideal response?
Because of the Casparian strip, the endodermis forces the nutrients to enter the cytoplasm in order to
pass. This is beneficial for two reasons. First, it allows the plant a higher level of regulation as to
what gets into the xylem. Most small ions could diffuse through the walls of the cortex cells, but only
the materials taken into the cytoplasm can pass the endodermis. Second, this allows the plant to
accumulate high levels of ions in the region of the xylem, creating a hypertonic environment that will
draw water into the root.
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During the inventory of bacterial genes present in the Sargasso Sea in the middle of the Atlantic Ocean, a research team concluded that at least 1800 bacterial species were discovered
Based on what you know about this area, what would you expect to see in coral reef waters? A) slightly greater genetic diversity B) slightly smaller genetic diversity C) equal genetic diversity D) markedly greater genetic diversity E) markedly smaller genetic diversity
Which of the following is not a specialized plant stem?
1.bulb 2.cladode 3.corm 4.tuber
Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?
A. Exposing organisms to the air on a benchtop so they completely dry out is an example of using osmotic pressure as a means of microbial control. B. Exposing a microbe to a hypertonic environment draws water out of the cell, causing plasmolysis. C. Salts and sugars external to a microbe create a hypotonic environment, which causes lysis of the cell. D. Salt is an effective solute to create an osmotic pressure gradient outside of a cell; however, the use of sugar, such as in jams and jellies, works via a different mechanism.
Energy is defined as
A. change. B. the capacity to do work. C. heat. D. movement.