Watering Experiments: A Study of Plant Health and Controlled Variables

Mark and Molly conduct an experiment to determine the optimal watering schedule for plants. Mark waters his plant once a week with sunlight, while Molly waters hers three times a week without sunlight. Mark's plant thrives, leading him to conclude that less frequent watering is better. However, the experiment is flawed due to unequal sunlight exposure. A controlled experiment is needed, where all variables except one are constant. When repeated with equal sunlight, Molly's watering schedule proves more effective. Repetition ensures accuracy in scientific experiments.

What was the initial watering schedule for Mark's plant?

• 200 mL of water twice a week

• 150 mL of water every other day

• 100 mL of water once a week

• 50 mL of water every day

Where did Molly place her plant?

• In the garden

• On the balcony

• In the closet

• In the window

What was the main difference in the conditions for Mark's and Molly's plants?

• Type of soil used

• Type of plant

• Amount of sunlight received

• Size of the pot

What did Mark conclude initially about watering plants?

• It's better to water a plant three times a week

• It's better to water a plant twice a week

• It's better to water a plant once a week

• It's better to water a plant every day

What is a controlled experiment?

• An experiment where all variables are changed

• An experiment where all variables are unknown

• An experiment where all variables are kept constant except one

• An experiment with no variables

What is the independent variable in Mark and Molly's experiment?

• Type of plant

• Amount of water given

• Type of soil

• Size of the pot

What was the result when both plants received equal sunlight?

• Mark's plant was healthier

• Molly's plant was healthier

• Both plants died

• Both plants were unhealthy

Why is it important to repeat experiments?

• To use different plants each time

• To change all variables

• To make the experiment more complex

• To ensure accuracy and rule out mistakes

What should be kept constant in a controlled experiment?

• All variables

• Only the independent variable

• All variables except one

• No variables

What is the general use of controlled experiments in science?

• To ensure all results are the same

• To change all variables

• To keep everything constant except one variable

• To use different methods each time