Life Science 7th grade Unit 1 Interdependence of Life

Which of the following is true?

• Water is important to some organisms.

• Some substances must be dissolved in water before they can be used.

• All organisms obtain water through food.

• Plant cells are unaffected when water is scarce.

Which of the following expresses why water is so important to living organisms?

• It assists organisms in releasing carbon dioxide.

• It assists organisms in breathing in oxygen.

• It assists organisms in obtaining certain dissolvable substances.

• It assists organisms in remaining disease free.

During a strenuous soccer game, a student is sweating a lot. Which of these would help her maintain her water balance?

• increasing breathing and heart rate

• refraining from drinking any water

• wiping off perspiration with a towel

• drinking more water or other fluids

Which of the following is one way that the circulatory system helps maintain body temperature?

• carrying heat around the body

• controlling the flow of blood to the skin

• carrying nutrients and energy to cells

• speeding up the blood flow to generate heat

Which of the following describes a response to external stimuli?

• a rabbit runs away from a fox that is chasing it

• a woman drinks water when she is thirsty

• a boy eats food when he is hungry

• a person yawns when oxygen levels in the blood are low

Which of these is not a response to internal stimuli?

• eating when hungry

• breathing hard when exercising because of a drop in oxygen levels

• drinking when thirsty

• wearing sunglasses to protect eyes from UV rays

How would a houseplant respond to sunlight that comes from one direction?

• by closing its leaves at night

• by curling its stem around its leaves

• by bending its stem toward the sun

• by growing roots downward through the soil

What kind of factors are light, temperature, and soil composition?

• ecological

• biotic

• abiotic

• habitat

Which condition is a biotic factor of an aquarium ecosystem?

• algae growing on the glass

• gravel on the bottom of the aquarium

• temperature of the water

• amount of oxygen in the water

Which choice describes a community?

• the desert

• a hole in which a snake lives

• a forest of birds, insects, and squirrels

• a desert of sand, rocks, hawks, and snakes