Reference no: EM132203176

1.Neuron stimulation is an example of what type of feedback mechanism and why?

a. negative feedback; message is being depressed.

b. negative feedback; message is increasing the effect.

c. positive feedback; message is being amplified.

d. positive feedback; the message is weakening the signal.

2. You hypothesize that the bending of a plant is a result of phototropism. Which data best supports this claim?

a. A plant of the same species was placed next to the original plant, and after 12 hours in the light, it was observed to also bend toward the light.

b. A second light was placed on the opposite side of the plant from the original light source, and after 12 hours under both light sources, the plant did not bend toward the second light.

c. The plant grew 0.9 cm after 12 hours in the light and 0.1 cm after 12 hours of darkness.

d. The plant was turned so it bent away from the light, and after 12 hours of light, the plant began turning back toward the light.

3. The average annual temperature of a southern forest in Canada has dropped more than 20 degrees over the past 10 years. Which method would be best for determining whether this abiotic change has affected the physiology of the local bear population?

a. Count the number of bears in the region each year for several years.

b. Identify the food eaten by the bears and observe whether it changes over time.

c. Map the territories of the bears over several years and determine whether the bears are moving to new locations.

d. Measure the fur density and fat layers of the bears each year for several years.