Science Exams- REVIEW

What is an ecosystem composed of?

• only one species in a given area.

• only the living organisms in a given area.

• all of the abiotic factors of a given area.

• all of the biotic and abiotic factors of a given area.

Which of the following is true of prey animals?

• Prey animals are the organisms that eat other organisms.

• Prey animals are organisms that are eaten by other organisms.

• Prey animals pass their energy on to plants in a food web.

• Prey animals depend only on plants to eat for their survival.

How does an increased population size affect the amount of competition between organisms?

• It increases the competition as the fitness of all involved organisms increases.

• It decreases the competition because additional organisms create more resources.

• It increases the competition because there are more organisms requiring the same resources.

• It decreases the amount of competition as organisms will alter their requirements for survival.

Two students generated their model of an energy pyramid in a deciduous forest. The models are pictured above.

Which model correctly shows the flow of energy?

• Energy pyramid A because it shows that the consumer gets energy from each organism that is lower.

• Energy pyramid B because it shows that at each level there is energy flow between organisms.

• Energy pyramid A because it shows the energy being transferred from the producers to the level of consumers above it.

• Energy pyramid B because it shows the producer transferring energy to the consumers at each level.

Based on the graph, the logical explanation to support a change in the rabbit population is...

• 1845 to 1855 the lynx population increased.

• 1855 to 1865 the lynx population remain unchanged.

• 1875 to 1885 the lynx population decreased.

• 1925 to 1935 the lynx population increased.

Select three reasons why a pond environment allows frogs to thrive.

• It has lily pads for the frogs to use to jump across the pond.

• It is full of different kinds of plants that the frogs can eat.

• It is a moist environment in which frogs can lay their eggs.

• It has many places for frogs to blend into their environment.

• It has many different animals with whom the frogs can reproduce.

A science teacher shows students a “working” model of a plant cell. The model transforms the same kind of energy as a plant cell, but it stores the energy in a battery. The teacher places the plant cell model on the windowsill. Which prediction about its behavior is accurate?

• The model will charge its battery during daylight hours only.

• The model will charge its battery during the high temperatures of summer months.

• The model will release oxygen at the same time that it charges its battery.

• The model will consume carbon dioxide at the same time that it charges its battery.

A student wants to develop a model of a plant cell and a model of an animal cell. Plant and animal cells are both eukaryotic and share many common characteristics. Which list BEST describes the characteristics that should be included in both of the models?

• a nucleus, cytoplasm, lysosomes, and a cell wall that strengthens the cell

• a nucleus, cytoplasm, ribosomes, and chloroplasts that absorb light energy

• a nucleus, cytoplasm, organelles, and a cell membrane that controls the movement of substances into and out of the cell

• a nucleus, cytoplasm, mitochondria, and a permanent vacuole that can hold large amounts of cell fluid

The picture shows an amoeba, a single-celled organism, surrounding a smaller single-celled organism through a process called endocytosis.

Endocytosis by a single-celled organism is most similar to which function in a multi-celled organism?

• controlling temperature

• breathing oxygen

• eating food

• eliminating waste

The illustration below shows a process performed by a cell to maintain homeostasis.

What is this process?

• mitosis

• photosynthesis

• the removal of wastes

• the intake of nutrients