Altruistic behavior ____
a. works in a similar way to selfish herds
b. is sexually directed behavior
c. is self-sacrificing behavior
d. is aggressive behavior
e. is nonreactive, such as freezing at the sign of danger
ANSWER: c
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Why are mycorrhizal fungi superior to plants at acquiring mineral nutrition from the soil?
A) Hyphae are one hundred to one thousand times larger than plant roots. B) Hyphae have a smaller surface-area-to-volume ratio than do the hairs on a plant root. C) Mycelia are able to grow in the direction of food. D) Fungi secrete extracellular enzymes that can break down large molecules.
In what way do fungi reproduce?
a. asexually, through spores b. budding of the parent body c. sexually, through gametes d. asexually, through spores and budding of the parent body e. asexually, through spores, budding of the parent body, and sexually, through gametes
How many chromosomes are in a human gamete?
A) 23 B) 46 C) 26 D) 42 E) 43
Which is the most economically important bryophyte?
a. Equisetum. b. Anthoceros. c. Psilotum. d. Sphagnum. e. Lycopodium.