Scientific Method
The title of a graph or data table should include what TWO factors?
independent and dependent variables
What does the term abiotic mean?
nonliving
Name the three reactants of photosynthesis.
carbon dioxide, sunlight, water
What does salinity mean?
how much salt is in a solution
density = mass divided by...
volume
What type of variables must be maintained throughout the course of the lab experiment?
controlled variables
Name the abiotic factor: energy moving through water that changes based on wind strength, distance traveled, and duration.
waves
Name a product of cellular respiration
carbon dioxide, energy, water
What is the average salinity of the ocean in ppt?
35 ppt
Density of 35 ppt seawater = 35g + 1000mL / 1000mL= ? (include units)
1.035 g/mL
Suzy tests to see if water salinity affects the growth of sea stars. What is the independent variable?
water salinity
Name the abiotic factor: make up the ocean floor, hard rock, soft sediment, artificial structures
substrate
Net primary production is the amount of what left after cellular respiration that is then available to heterotrophs
organic matter (carbohydrates, etc.)
If a solution has a salinity of 12 ppt, what many grams of salt does it contain per 1 kg (or 1000mL)?
12 g
Which is more dense...seawater or fresh? Why?
seawater; added weight of salts
Suzy tests to see if water salinity affects the growth of sea stars. What is the dependent variable?
growth of sea stars
What abiotic factor may cause an organism to dry out or be more exposed to predators?
aerial exposure
Gross primary productivity is the amount of carbon fixed by producers during what process?
photosynthesis
Which of the following would be the salinity of brackish water?
less than 0.5ppt, 0.5-30ppt, 30-40ppt, or more than 40 ppt
0.5-30ppt
You are layering two different colored solutions in a beaker. The blue solution has a density of 1.065 g/mL while the green has a density of 1.042 g/mL. Which solution will remain at the top? Why?
Green; less dense
Suzy tests to see if water salinity affects the growth of sea stars. First, she measures the initial mass of the sea stars. Then, she places four sea stars into an aquarium with a salinity of 10 ppt, and another four in an aquarium with a salinity of 30ppt. After three weeks she measures the mass of the se stars. Name three types of quantitative data from this experiment.
salinity, mass (initial and final), number of sea stars, time
Identify at least 2 ways currents are important to the survival of marine organisms.
carry nutrients, migration, distribution of eggs
In the light-dark bottle technique, what was measured to determine how much photosynthesis was occurring in the bottles?
amount of oxygen
Make a 32 g salt water solution with a salinity of 32ppt. How much salt and water would you need?
(32g x 32ppt) / 1000 = 1.024g of salt
32 g water - 1.024g salt = 30.976 g of water (or mL)
A saltwater solution has a salinity of 24 ppt. What is its density?
HINT: (Mass of water + salt) / volume of water
(24g + 1000mL)/ 1000mL = 1.024 g/mL