Biology A End of Semester Review Test Fall 2024

Scientists are concerned about butterfly species dying off. They are pollinators, and if they are gone, many plant species will die off because they cannot reproduce. This will cause many populations to decline. What will happen to biodiversity and sustainability as a result?

• Biodiversity will decrease, and sustainability will increase.

• Biodiversity will decrease, and sustainability will decrease.

• Biodiversity will increase, and sustainability will increase.

• Biodiversity will increase, and sustainability will decrease.

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Which organisms in the food web are both primary and secondary consumers?

• Snakes

• Coyotes

• Cattails

• Bluegills

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If the producers in a food web were removed, which of the following changes would most likely occur?

• The consumers would begin creating energy for the food web

• The entire food web will eventually collapse.

• The populations of the remaining organisms in the food web would increase rapidly to fill the space.

• The food web would depend on the decomposers to produce energy

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Prolonged periods of drought in an area cause decreases in plant population sizes. Which of the following statements describes how the decreases in plant population sizes then affect other populations in the area?

• Omnivore population sizes decrease, and carnivore population sizes increase

• Omnivore population sizes increase, and herbivore population sizes increase

• Herbivore, omnivore, and carnivore population sizes decrease.

• Herbivore population sizes increase, and carnivore population sizes decrease

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Use the graph and information below to answer the question.

• a death rate of zero

• a death and birth rate that is equal

• a birth rate that is half the death rate

• a birth rate that is twice the death rate

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Pheasants are a type of bird. Two male pheasants and six female pheasants were introduced onto an island with abundant food and few predators. Within six breeding seasons, the pheasant population increased from eight birds to two thousand birds. Over time, however, the growth rate of the population slowed. Which of the following statements describes the most likely reason for this decrease in population growth rate?

• Females built smaller nests, which decreased the birth rate

• Large numbers of birds needed mates, which increased the immigration rate

• The death rate increased because the competition for resources increased.

• Fewer eggs hatched each successive year, which decreased the emigration rate

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Within a prey population, which of the following is most immediately affected by the arrival of a new predator?

• The rate of death

• The rate of immigration

• The rate of maturation

• The rate of evolution

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Use the graph below to help you respond to the following question. Assume that conditions in the habitat remained similar to those in 1990. Based on the data, which of the following changes most likely occurred from 1990 to 2000?

• The wolf population increased and the moose population decreased

• The wolf population decreased unchecked

• The moose population increased unchecked

• The moose population and the wolf population leveled off at their carrying capacities

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Pompeii worms, Alvinella pompejana, live in tubes along hydrothermal vents on the sea floor. The worms are covered by a layer of bacteria. Scientists have discovered that the bacteria insulate the worms from the extreme heat of the vents, and the worms secrete mucus from glands on their backs to feed the bacteria. Which of the following terms best applies to the relationship between the Pompeii worms and the bacteria?

• competition

• parasitism

• commensalism

• mutualism

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Which of the following conditions is most likely to lead to an increase in a chipmunk population?

• the arrival of another small herbivorous mammal

• the disappearance of a snake species that prey on the mouse

• the presence of a greater number of predatory birds

• the lack of adequate rainfall for plants in the chipmunk’s habitat

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