1. In October of 2003, a raging wildfire swept through the mountain ecosystems i
ID: 45546 • Letter: 1
Question
1. In October of 2003, a raging wildfire swept through the mountain ecosystems in Southern California, burning everything in its path to the ground and driving away all of the animals. In order for the mountain ecosystem to establish itself, which member of the food web has to return first?
Deer
Coyotes
Snake
Grasses
2. Suppose you conduct an experiment which simulates glacial recession over time. What is the dependent variable in this experiment?
Glacial mass
Sunlight
The season
Time
3. How many dependent variables can be tested during any single experiment?
4
3
2
1
4. The effectiveness of a medication containing growth hormones is tested on a group of young male rabbits 3 weeks of age. The best control group would be:
Any group of rabbits
A group of male rabbits, three weeks old, not given the medication
A group of female rabbits, three weeks old, not given the medication
A mixed group of male/female rabbits, three weeks old, not given the medication
No control is required; just measure whether the rabbits grew
5. When writing a lab report or a research paper, you need to show what the difference is between the
Explanation / Answer
1. Grasses are the primary producers and in order for the mountain ecosystem to establish itself, the grasses in the food web has to return first. Option Grasses is correct.
2. In an experiment which simulates glacial recession over time, the dependent variable is the glacial mass. This is becacuse as the time increases the glacial recession increases and the glacial mass decreases. Option Glacial mass is correct.
3. In an experiment 4 dependent variables can be tested. For example, in an experiment of effect of temperature on plant growth, the temperature is independent variable whereas, the plant height, weight, width of the stem and number of fruits are different dependent variables. 4 is correct.
4. A group of male rabbits, three weeks old, not given the medication could be the best control group. This is because experimental group and the control group should be of same age and gender to study the effects of the medication in the experimental group that will be not observed in the control group. Option 2 is correct.
5. In a research work the outcome of experiment is the data represented as results and the discussion is analysis of that data. The Discussion analyzes data, whereas the Results displays data is correct.
6. Carbon can form as a good backbone for creating diverse and durable molecules because it can form 4 covalent bonds.
7. Catabolic pathway means break down of macromolecules into simpler forms. Converting glucose to carbon dioxide and water (cellular respiration) is a catabolic process.
8. Change in the DNA from GAA to GUA is an example of mutation which may result in a disease.
9. Subatomic particles are found in the nucleus are protons and neutrons.
10. H20, NaCl, CO2, and HCl all are inorganic molecules.
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