Which of the following statements are true of the stomata on the leaves of vascular plants?
_____ They regulate intake of carbon dioxide needed for photosynthesis.
_____ They regulate release of oxygen to the air.
_____ They regulate loss of water.
_____ They are able to open or close depending on environmental conditions.
_____ They regulate the absorption of light by chlorophyll.
__X__ They regulate intake of carbon dioxide needed for photosynthesis.
__X__ They regulate release of oxygen to the air.
__X__ They regulate loss of water.
__X__ They are able to open or close depending on environmental conditions.
_____ They regulate the absorption of light by chlorophyll.
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Breathing is primarily regulated by _____
A) erythropoietin levels in the blood B) the concentration of red blood cells C) hemoglobin levels in the blood D) carbon dioxide concentration and pH-level sensors E) the lungs and the larynx
If all functional groups are removed from an organic molecule, leaving only a hydrocarbon chain, the molecule becomes a:
A. Lipid B. Carbohydrate C. Protein D. Nucleic acid
Nitrogen fixation and nitrification are directly important processes for:
a. heterotrophic animals. b. heterotrophic bacteria. c. autotrophic organisms. d. fungi. e. viruses.
Four of the five answers are ways by which animals remove water and/or unwanted solutes. Select the exception
a. excretion in urine b. secretions c. exhalation d. elimination in feces e. bleeding