What are guard cells and how are they able to control the opening and closing of stomata. What will be an ideal response?
ANSWER: A pair of specialized epidermal cells defines each stoma (stoma is the singular form of
stomata). When these two guard cells swell with water, they bend slightly so a gap (the
stoma) forms between them. When the guard cells lose water, they collapse against one
another, so the stoma between them closes. Open stomata allow water—a lot of it—to exit
the plant.
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A bacteriophage that lacks its proteinaceous capsid structure is also called a viroid
Indicate whether the statement is true or false.
What is another name for the cell membrane?
What will be an ideal response?
Which of the following membrane activities does NOT require the expenditure of energy by the cell?
a. active transport b. osmosis c. endocytosis d. exocytosis e. synthesis of more membrane
If you listen to a rock band at 130 dB, it may cause irreversible hearing damage. In contrast, tasting a boiling hot soup may burn your tongue but does not cause permanent damage. How can you explain this difference?
What will be an ideal response?