Exploring the balance between different organisms and the resources that they require.


OGT Questions:

  1. Rising ocean temperatures can cause corals to expel the symbiotic algae on which they depend for survival.

    Which human influence could be responsible for an increase in this phenomenon?

    1. shoreline erosion
    2. burning fossil fuels
    3. solar power generation
    4. introduction of non-native species
  2. An aquatic ecologist collects data about the water quality of an Ohio lake throughout the year. In the summer, the ecologist shares data with a public health official from a nearby town.

    Which data would a public health official use to determine whether the water was safe for swimming?

    1. the temperature of the surface water
    2. the amount of dissolved oxygen in the deep water
    3. the number of water lilies, N. odorata, growing in the lake
    4. the concentration of E. coli bacteria near the surface of the lake
  3. A group of students designs an experiment to test how an herbicide affects pepper plants and weeds. Eight plots are tested, each of which holds 25 pepper plants and a variety of weeds. Plots 1 and 2 are not treated; plots 3 – 8 are treated with varying amounts of weed-killing herbicide. The weeds are counted in each plot during week 1. The herbicide is applied during week 2, and the weeds are counted again in week 3. The data are shown in the table below.

    A student is concerned that the experiments could cause widespread damage to the local ecosystem. A relevant concern may be

    1. increasing the genetic diversity in the weed population.
    2. runoff or absorption of the herbicide into local water sources.
    3. the use of atmospheric carbon dioxide gas for photosynthesis.
    4. the effect of the herbicide on pepper production in the treated plots