Question 1:

Which of the following factors contributes to the exponential growth of a population?

Explanation: The high reproductive rate of individuals is a factor that contributes to the exponential growth of a population. In exponential growth, the population size increases rapidly without any limitations from resources or other factors. Therefore, option D is correct.

Question 2:

Which of the following describes the relationship where one species benefits while the other is neither harmed nor benefited?

Explanation: Commensalism is a type of symbiotic relationship in which one species benefits while the other is neither harmed nor benefited. An example is a bird building its nest in a tree. The bird benefits from the shelter provided by the tree, while the tree is not affected. Therefore, option A is correct.

Question 3:

Which of the following is an example of a density-dependent factor that can regulate population size?

Explanation: The availability of food is a density-dependent factor that can regulate population size. As population density increases, competition for limited food resources also increases, which can limit population growth. Therefore, option D is correct.

Question 4:

Which of the following is an example of a primary consumer in an ecosystem?

Explanation: A primary consumer is an organism that directly consumes producers (plants) in an ecosystem. In this case, the grasshopper is the primary consumer as it feeds on plants. Therefore, option C is correct.

Question 5:

Which of the following best describes a symbiotic relationship where one species benefits while the other is harmed?

Explanation: Parasitism is a symbiotic relationship where one species (the parasite) benefits at the expense of the other species (the host), which is harmed. Examples include ticks feeding on the blood of animals or internal parasites affecting the health of their host organisms. Therefore, option C is correct.