Resources and ecosystem interactions

9.What is an example of a short-term biological interaction?

10.Which of the following is an adaptation of a predator for hunting?

11.According to the source, which classification of biological interactions is based on the duration of the interaction?

12.In the context of biological interactions, what does the term 'commensalism' mean?

13.A population of rabbits in a meadow has access to abundant grass, but a drought reduces the grass supply. Which of the following is the most likely immediate effect on the rabbit population?

14.In a study of a forest ecosystem, researchers measured the number of seeds produced by a plant species and the number of seed-eating mice. They found that when seed production was high, the mouse population increased the following year. Which type of interaction best describes the relationship between the plant and the mice?

15.A farmer notices that when he plants two different crop species in the same field, both crops produce smaller yields than when planted separately. This is an example of which type of biological interaction?

16.Which of the following is an example of a short-term biological interaction?

17.A scientist observes that a certain species of bird eats insects that live on the bark of trees. The birds do not harm the trees. Which type of interaction is this?

18.Which of the following is an adaptation of a prey species to avoid predation?

19.The graph shows two populations that both fluctuate but when one increases, the other decreases, and vice versa.

20.In an experiment, a student places a plant in a sealed jar with a snail. The plant and snail both survive for several weeks. Which interaction is most likely occurring?

21.A study of a grassland ecosystem found that when wolves were reintroduced, the elk population decreased, and the vegetation along rivers recovered. Which of the following best describes the role of wolves in this ecosystem?

22.In a forest, two species of birds feed on the same type of insect. However, one bird feeds in the treetops while the other feeds near the ground. This is an example of:

23.Which of the following interactions is harmful to both organisms involved?

24.A student sets up two sealed jars, each with a plant and a snail. Jar A is placed in sunlight; Jar B is kept in darkness. After one week, the snail in Jar B is dead, but the plant and snail in Jar A are alive. Which conclusion is best supported?

25.In a field experiment, researchers placed cages over some plots to exclude rabbits and left other plots open. After two months, the caged plots had more grass and fewer clover plants than the open plots. Which interaction is most likely occurring between rabbits and clover?

26.A student counts the number of dandelion plants in a lawn before and after applying a fertilizer. The number of dandelions increases from 20 to 80 per square meter. What is the percentage increase in dandelion density?

27.Which of the following is an example of a long-term symbiotic relationship?

28.The graph shows the population sizes of two species over time. When species A increases, species B decreases, and vice versa. Which interaction is most likely?

29.A scientist wants to test whether a certain fungus helps a plant absorb water from the soil. Which experimental setup would best test this?

30.In an ecosystem, which of the following is a biotic factor that can limit the size of a population?

31.A farmer notices that when she plants beans and corn together in the same field, both crops produce higher yields than when planted separately. Which interaction best explains this?

32.A student observes that a certain species of bird eats insects that live on the bark of trees. The birds do not harm the trees. Which type of interaction is this between the bird and the tree?

33.What is the term for a biological interaction that occurs between organisms of different species?

34.In the classification of biological interactions based on time, which of the following is considered a long-term interaction?

35.A researcher measures the population of rabbits in a field over three years. In year 1, the rabbit population is 50. In year 2, it increases to 75. In year 3, it decreases to 60. Which of the following is the most likely cause of the decrease from year 2 to year 3?

36.In an experiment, two species of bacteria are grown together in a culture with limited glucose. After 48 hours, species A has a population of 1×10⁶ cells/mL, while species B has a population of 2×10⁵ cells/mL. When grown separately under the same conditions, species A reaches 1.5×10⁶ cells/mL and species B reaches 1×10⁶ cells/mL. Which interaction best describes the relationship between species A and B?

37.The table shows the number of seeds produced by a plant species in two different habitats over one year. | Habitat | Number of seeds produced | |---------|-------------------------| | A | 500 | | B | 800 | Which of the following is a valid conclusion based on the data?

38.A farmer notices that when she plants beans and corn together in the same field, both crops produce higher yields than when planted separately. Which interaction is this?

39.In a study of a forest, researchers found that when the population of deer increases, the number of tree seedlings decreases. Which of the following best explains this relationship?

40.A graph shows the population sizes of two species over 10 years. Species X fluctuates between 100 and 200, while species Y fluctuates between 50 and 100. The peaks of species X occur one year before the peaks of species Y. Which interaction is most likely?