In the "Quicker Picker Upper" lab exercise, which of the

1. In the "Quicker Picker Upper" lab exercise, which of the following was your independent variable?

   brand of paper towel

   weight of water absorbed

   volume of water in pan or beaker

   time

2 points

QUESTION 2

1. In the "Quicker Picker Upper" lab exercise which of the following best describes your dependent variable?

   amount of water absorbed by the paper towel

   time

   thickness of paper towel

   brand of paper towel

2 points

QUESTION 3

1. Which of the following best describes the appropriate controls for the paper towel lab exercise?

   size of paper towel and the amount of water applied to each towel

   size of paper towel, amount of water applied to each piece of towel, and the time allowed for each towel to absorb water

   size of paper towel only

   amount of water applied to each paper towel only

2 points

QUESTION 4

1. Which of the following would hold the most dissolved oxygen?

   cold fresh water

   cold salt water

   warm fresh water

   warm salt water

2 points

QUESTION 5

1. Dissolved oxygen in water can increase due to which of the following processes?

   photosynthesis

   water flowing rapidly

   a fountain (similar to the one in library pond)

   all of the above

2 points

QUESTION 6

1. Fecal coliform bacteria are disease causing organisms.

   True

   False

2 points

QUESTION 7

1. A solution with a pH of 4 _____________ vs. a solution with a pH of 5.

   is less acidic and therefore has less hydrogen ions

   is more acidic and therefore has less hydrogen ions

   is less acidic and therefore has more hydrogen ions

   is more acidic and therefore has more hydrogen ions

2 points

QUESTION 8

1. Freshwater should have a salinity of:

   0-1 ppt

   0-0.5 ppt

   0-30 ppt

   0-10 ppt

2 points

QUESTION 9

1. High turbidity means clearer water.

   True

   False

2 points

QUESTION 10

1. Phosphates and nitrates can both increase plant and algal growth.

   True

   False