8th Grade Life Sciences Review

The human circulatory system and respiratory

system work together to help the body maintain

homeostasis. Which of the following is a result

of the effort between these two systems?

• the intake of oxygen

• the intake of carbon dioxide

• the intake urine

• the intake of salts

What is the primary role that plants play in the

carbon cycle?

• They absorb carbon dioxide and release

  oxygen.

• They absorb soil and release water.

• They create food and absorb nutrients.

• They create oxygen and release water.

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A genus is a taxonomic grouping that identifies a

collection of species. When a scientist discovers

a new species, how is this species assigned to a

genus?

• It is put with the species that live in similar

  climate zones.

• It is put with the species that live in the

  same geographical region.

• It is put into a new genus until more

  information can be gathered.

• It is put with the species with which it shares

  the most physical characteristics.

What is the role of the algae in this food chain?

• to provide the animals with shelter from the sunlight

• to break down the remains of the other organisms

• to convert sunlight into usable energy for the other organisms

• to provide oxygen for the minnows to breathe

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How are a tomato plant and a Persian cat

similar?

• They are both made of cells with specialized

  functions.

• They both have muscular systems.

• They both have cells with rigid cell walls

  that do not allow them to be very flexible.

• They both have chloroplasts that they use to

  make food.

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Chloroplasts are the organelles responsible for

photosynthesis in plants. If all the chloroplasts in

a plant lose function as a result of a genetic

disorder, what will happen to the plant?

• Its growth rate will slow or stop.

• It will find energy in the soil instead of from

  sunlight.

• It will evolve a new mechanism for

  generating food.

• It will grow longer roots in search of food.

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Some vertebrates are able to reproduce asexually.

What is NOT true of asexual reproduction?

• Asexual reproduction occurs less commonly

  among single-celled animals.

• Asexual reproduction can occur through

  more than one type of process.

• Asexual reproduction causes a population to

  have more genetic variety.

• Asexual reproduction allows for a rapid

  population increase in areas with very low

  population densities.

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A part of an animal is dissected and found to

contain nerves, muscles, and skin cells. What is

the level of organization of the part?

• The part is a cell composed on one tissue.

• The part is a tissue composed of several

  different cell types.

• The part is a system composed of several

  organs.

• The part is an organ composed of several

  different tissues.

The carbon cycle is the continuous exchange of

carbon dioxide and oxygen between living things

in the natural environment. Which step in the

carbon cycle involves the transformation of

carbon dioxide into oxygen?

• the transformation of plants into fossil fuels

• photosynthesis

• cellular respiration

• the burning of fossil fuels

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A pea plant can have seeds that are wrinkled or

smooth. The gene for the wrinkled seeds is a

dominant gene. If two pea plants with smooth

seeds reproduce 10 times, how will the seeds of

their offspring most likely appear?

• All the offspring will have smooth seeds.

• Some offspring will have smooth seeds and

  some will have wrinkled seeds.

• Each offspring will have some wrinkled

  seeds and some smooth seeds.

• All the offspring will have wrinkled seeds.