You spray your lawn with a pesticide. The concentration of the pesticide in the tissues of the grass on your lawn is 10?6 parts per million (ppm). Grasshoppers eat the grass and are in turn eaten by rats, which are then eaten by owls. At each
successive trophic level, the concentration of pesticides increases. The term for this process is
A) extirpation.
B) biological magnification.
C) habitat loss.
D) climate change.
Answer: B
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The algal ancestors of land plants are most likely similar to the
a. Rhodophyta. b. Phaeophyta. c. Chrysophyta. d. Charophyta. e. Radiolaria.
What type of plants live for one year?
A) annuals B) biennials C) perennials D) woody plants
Density-independent factors are abiotic.
Indicate whether the statement is true or false
Which example of an evolutionary adaptation decreases herbivory?
A) Plants of the milkweed family produce a toxin that Monarch butterflies can store in their bodies. B) Corn plants attacked by herbivores release an airborne chemical that turns on defensive genes in nearby corn plants. C) Caterpillars that feed on plants tend to be green. D) Damaged, partially eaten leaves can seal off the damaged area by hardening cell walls.