Farmers often practice crop rotation to help enrich agricultural fields. Why are beans and other legumes often used in the rotations?
A. Less carbon dioxide.
B. Bacteria in legume root nodules are nitrifiers.
C. Legumes remove toxins from the soil.
D. Legumes enrich the soil by forming heterocysts.
E. Beans fix nitrogen.
Answer: B
You might also like to view...
A yellow jacket, an insect in the order hymenoptera, stung me. A wasp, an insect in hymenoptera, stung me. A hornet, an insect in hymenoptera, stung me. I see a pattern. All insects in this order must have stingers. What type of reasoning does this represent?
A. inductive reasoning B. deductive reasoning C. reductionism D. comparative reasoning
Dr. Gregory House, a character on a television program, experiences severe withdrawal symptoms when he stops taking hydrocodone, a drug that he originally took to alleviate leg pain, but has not been able to give up. He is exhibiting
A) tolerance. B) dependence. C) paranoia. D) suicidal ideation.
Plants grow toward light through the action of
A) hormones. B) nerves. C) phytochrome. D) chloroplasts.
What is the smallest distance two points can be separated and still resolved using light microscopy?
(a) 20 nm (b) 0.2 ?m (c) 2 ?m (d) 200 ?m