The main structure for gas exchange in plants is called the
A. root.
B. epidermis.
C. stomata.
D. mesophyll.
E. chloroplast.
C. stomata.
You might also like to view...
Which of the following statements is false?
A. Decreasing levels of oxygen in the blood are detected by chemoreceptors in the brainstem. B. Breathing is controlled by both voluntary and involuntary mechanisms. C. Chemoreceptors involved in the homeostatic control of breathing are located in the brainstem and the carotid and aortic bodies. D. Stronger or more frequent contraction of respiratory muscles helps to remove excess CO2 from the blood. E. As an organism's activity level increases, the level of CO2 in the blood will increase and stimulate faster or stronger breathing.
If a cell begins to divide in an uncontrolled way, it ____
a. will always form a cancerous tumor b. may form a benign tumor c. is a sign of metastasis d. is considered a malignant tumor e. signals uncontrolled cell division in other parts of the body
Kin selection is a form of natural selection in which ____
a. dominant individuals share resources disproportionately with their close relatives b. individuals help relatives only if they are likely to return the favor in the future c. group members sacrifice their own reproductive success to help individuals who are not their direct descendants d. shared alleles for altruism are perpetuated if the assisted animals produce more offspring than the helper could have produced if he had not helped e. shared alleles for altruism are perpetuated if the helper produces more offspring than the relatives that he aids
The risk of kidney stones increases with:
a. a high carbohydrate diet b. a low calcium diet c. being female d. obesity e. drinking too much water