Question

6 multiple choice 2 points a biologist is studying a population of rabbits in a forest. she observes an area of 5 square kilometers and counts 200 rabbits. based on her observations, calculate the population density of rabbits in the forest. 200 rabbits per square kilometer 1000 rabbits per square kilometer 10 rabbits per square kilometer 40 rabbits per square kilometer 7 multiple choice 2 points in a certain ecosystem, the population of deer has been increasing rapidly over the past few years. which of the following scenarios exemplifies a density - dependent limiting factor that could naturally reduce the deer population size? a severe winter storm decreases the temperature significantly for an extended period. a wildfire reduces the forest area, diminishing the overall habitat available for the deer. water sources in the area are contaminated with heavy metals causing sickness and infertility. the spread of a contagious disease becomes more prevalent as the population density increases. 8 multiple choice 2 points what type of symbiotic relationship is illustrated in the following scenario? epiphytic plants, like certain orchids and ferns, grow on the branches of large trees in the canopy to access sunlight without depleting the host tree of nutrients, since they take their nutrients from the air and rain. predation parasitism commensalism mutualism

Explanation:

Question 6

Step1: Recall population - density formula

Population density = $\frac{\text{Number of individuals}}{\text{Area}}$

Step2: Substitute values

Number of rabbits = 200, Area = 5 square kilometers. So, population density=$\frac{200}{5}=40$ rabbits per square kilometer

Density - dependent factors are related to population density. A contagious disease spreads more as population density increases. Other options are density - independent factors.

Commensalism is a symbiotic relationship where one organism benefits and the other is neither helped nor harmed. Epiphytic plants benefit from the support of the tree to access sunlight, and the tree is not affected in terms of nutrients.

Answer:

D. 40 rabbits per square kilometer

Question 7