Before we plan an experiment ...

Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of the experiment. What is the INDEPENDENT VARIABLE on this experiment?

• Type of rose bushes

• The growth duration

• The number of flowers

Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of the experiment. What is the DEPENDENT VARIABLE on this experiment?

• Rosh bushes

• Time for growth

• The number of flowers

Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of the experiment. What are the CONTROL VARIABLES on this experiment?

• Type of rose bushes, the number of flowers, the plants location (greenhouse)

• Growth duration, the plants location (green house), amount of soil

• The number of flowers, amount of soil, amount of daily watering

You water three sun flower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured. What is the INDEPENDENT VARIABLE on this experiment?

• Sunflower plants

• The concentration of salt solutions

• The plant height

You water three sun flower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured. What is the DEPENDENT VARIABLE on this experiment?

• Sunflower plants

• The concentration of salt solutions

• The plant height

You water three sun flower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured. What are the CONTROL VARIABLES on this experiment?

• Type of plants (sunflower), the concentration of salt solutions, the periods for growth, the plant height

• Amount of soil, type of soil, the concentration of salt solutions, the growth period, the plant height

• The growth period, amount of soil, type of soil, amount of solutions

Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. Height of the tree is measured once a week. What is the INDEPENDENT VARIABLE on this experiment?

• The height of the redwood trees

• The location of the redwood trees

• The humidity levels

Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. Height of the tree is measured once a week. What is the DEPENDENT VARIABLE on this experiment?

• The height of the redwood trees

• The location of the redwood trees

• The humidity levels

Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. Height of the tree is measured once a week. What are the CONTROL VARIABLES on this experiment?

• The type of trees (redwood), the growth duration, type of fertilizer, the height of the redwood trees

• The type of trees (redwood), the growth duration, type of fertilizer, number of daily watering, type of additional plant nutrition.

• The number of daily watering, type of additional plant nutrition, the location of trees.

Pea plant clones are giving different amounts of water for a three-week period. The first pea plant receives 400 mL/day day. The second pea plant receives 200 mL/day. The third pea plant receives 100 mL/day. The fourth pea plant does not receives any extra water. The height of pea plants is recorded daily. What is the INDEPENDENT VARIABLE on this experiment?

• Type of plants

• The height of plants

• Amounts of water