A student is studying the effect of fertilizer on fruit growth. He uses 6 tomato plants, placing each in a garden where they get equal amounts of sun and water. One plant is given no fertilizer, while the other 5 plants are given 5, 10, 15, 20, and 25 grams of dissolved fertilizer each day for 3 weeks. At the end of the experiment the tomato fruits are weighed.
What is the dependent variable in this experiment?
(1 point)
Responses
amount of fertilizer
amount of fertilizer
sun exposure
sun exposure
fruit weight
fruit weight
amount of water
fruit weight
A student decides to test the effects of watering on plants. She chooses 6 tomato plants and places all of them in the same part of a garden with plenty of space between them. They get the same amount of sunlight and the same amount of fertilizer each day. She gives each plant a different amount of water, with the first plant getting no water and the others getting 200 mL, 400 mL, 600 mL, 800 mL, and 1,000 mL. She records the total height of the plants each day for 3 weeks.
What is the independent variable in this experiment?
(1 point)
Responses
sun exposure
sun exposure
amount of fertilizer
amount of fertilizer
plant height
plant height
amount of water
amount of water
The stem of a plant is growing upward while the roots grow downward. Which of these stimuli correctly describes the response of the plant?(1 point)
Responses
temperature
temperature
light
light
gravity
gravity
touch
gravity
The stem of a plant is experiencing phototropism. Which statement correctly describes the plant’s response?(1 point)
Responses
The stem moves toward the light for better photosynthesis.
The stem moves toward the light for better photosynthesis.
The stem bends to the sides because there are smaller cells on sides.
The stem bends to the sides because there are smaller cells on sides.
The stem grows upward because larger cells are growing.
The stem grows upward because larger cells are growing.
The stem moves away from the light for better photosynthesis.