Natural communities recycle nutrients, but cultivated communities often require an input of mineral nutrients due to losses through
A. erosion.
B. iron accumulation.
C. humus.
D. crop rotation.
E. nitrogen fixation.
Answer: A
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Which of the following best describes Mendel’s hybridizations?
a. the mating of two true-breeding individuals that have similar forms of the trait of interest b. the mating of two true-breeding individuals that have different forms of the trait of interest c. the mating of offspring back to one or both of their parents d. the mating of dominant-expressing organisms with homozygous recessive organisms
The edible portion of the mushroom is the ________
A) mycelium B) hypha C) spore D) above-ground reproductive structure
The concentration of the pesticide DDT is likely highest in which of the following?
A. a minnow B. a mosquito larva C. a seagull D. plankton E. algae
The sac fungi are distinguished from all other groups of fungi because their reproductive structures are ________.
A. borne on basidia B. zygospores C. motile D. inside an ascus