Ways for Cactus Survival in Desert

Select two ways in which the cactus can survive in a desert with little rainfall.

• by spreading its roots over a large area near the surface of the ground

• by covering itself with a thick, waxy coating to prevent loss of water

Select two ways in which the spiny leaves help the cactus survive in the desert.

• They help the cactus absorb water in the air.

• They attract pollinators to help spread the seeds.

• They prevent the cactus from losing water to the dry air.

• They protect the cactus from animals that want to eat it.

• They perform photosynthesis to provide the plant with energy.

What is the source of energy for a cactus?

• wind

• water

• sunlight

• electricity

What would be the benefit if humans used the same energy source as the cactus?

• It could be shared with people far away.

• More land would be available for farming.

• There would be fewer predator animals around.

• There would be little to no impact on the environment.

According to the ILEARN Grade 4 Science Item Key, what measurements are students required to take in the simulation to determine the growing conditions of the crops?

• Height of the crops, soil color, and leaf size

• Temperature, rain, and wind speed

• Number of crops, type of crops, and soil type

• Sunlight exposure, type of fertilizer used, and crop yield

For a full-credit response in Part A of the ILEARN Grade 4 Science Item Key, on which days must the student gather data?

• Day 1 and Day 7

• Day 7 and Day 14

• Day 1 and Day 14

• Any of the above combinations

How is temperature recorded in the ILEARN Grade 4 Science simulation?

• Degrees Celsius

• Degrees Kelvin

• Percent (%)

• Degrees Fahrenheit

What is the maximum number of data rows a student can collect in the simulation according to the ILEARN Grade 4 Science Item Key?

• Eight

• Ten

• Twelve

• Unlimited

What is the difference between Field A and Field B?

• temperature

• rain

• wind speed

• soil moisture

Select two data rows that provide evidence for the claim you made in part B.