Question

1. a science class went on a field trip to study the water quality of a nearby stream. which of these tools would be most useful in collecting samples of water to analyze and making observations? 17. louis is testing how the amount of fertilizer affects the height of plants. which variable does not need to be controlled? a. the amount of fertilizer b. the height of the plants c. the location of the plants d. the amount of water each plant gets 18. students will place books under a ramp to change the ramp’s height. then they will measure how far a car travels when it is released at the top of the ramp. which data table should they use? a number of books height of ramp speed traveled distance traveled 1 2 b number of books height of ramp distance traveled 1 2 c distance traveled speed traveled d number of books speed traveled 1 2

Explanation:

Step1: Analyze question 16

A graduated - cylinder (option A) is used for collecting and measuring liquid samples like water for analysis. A net (option B) is for catching organisms, a telescope (option C) is for viewing distant objects, and a balance (option D) is for measuring mass.

Step2: Analyze question 17

In an experiment testing how fertilizer amount affects plant height, the amount of fertilizer is the independent variable, the height of plants is the dependent variable. The location of plants and amount of water are extraneous variables that should be controlled. The height of plants is what is being measured and not controlled.

Step3: Analyze question 18

The students are changing the number of books (which changes the ramp's height) and measuring the distance the car travels. They don't need to measure speed for this experiment. The data table should have columns for the number of books (related to ramp height) and the distance traveled. Option B has these two relevant columns.

Answer:

1. A. Graduated - cylinder
2. B. The height of the plants
3. B.

Number of books	Height of ramp	Distance traveled
2