Question

Biologists designed an experiment to test the effect of compost on the development of root crops. They tested several different crops, including carrots, potatoes, beets, and onions. They grew most of the plants in the greenhouse, but due to space issues, they had to grow some outdoors. They gave all the plants the same amount of compost. They obtained the compost from a local farmer and from the local hardware store. They ran out of the farmer’s compost, so some of the plants received that compost when the seeds were planted and other plants got hardware store compost after the plants had already started growing.
RESULTS: Some of the roots seemed really big. Other roots seemed normal or small.

CONCLUSION: They couldn’t tell what the effect of the compost was because the results were inconsistent.

Which problems did you include in your answer? Check all that apply.

type of crop

variation in light

no control group

when compost was applied

variation in nutrients

variation in temperature

where plants were grown

compost from different sources

Answer 1

Variation in temperature

Variation in light

and which compost was applied

Answer 2

Answer:

• Variation in temperature   - because greenhouses moderate temperature, and some weren't in the greenhouse.
• Where plants were grown  - some plants were outside the greenhouse.
• When compost was applied - at different times for certain plants

• Compost from different sources - some from farmer, some from hardware store, and it could be different

Explanation:

Why isn't it the other answers?

• type of crop  - it's helpful to use different types of crops and compare
• variation in light  - the greenhouse shouldn't block light due to its transparent panels
• no control group  - this isn't an issue
• variation in nutrients  - all the plants should be obtaining the same nutrients through their roots once compost is applied