Concept explainers
a.
To find: The dependent variable in the given graph.
Introduction: Phytoplankton are the microscopic autotrophic marine algae that provide food for aquatic animals such as whales and snails. The growth of phytoplankton depends on the availability of sunlight, nutrients, and carbon dioxide.
a.

Explanation of Solution
The iron is a trace element required for photosynthesis in phytoplankton. If a water body contains an adequate amount of iron, phytoplankton would be able to fix carbon dioxide into carbohydrates. In order to calculate the number of phytoplankton produced, the level of chlorophyll-a is measured by monitoring the wavelength of absorbed light. In the given graph, the dependent variable is the concentration of chlorophyll-a that varies with the concentration of iron in the experiment.
b.
To determine: The relation between increase in the concentration of chlorophyll-a and the numbers of phytoplankton.
Introduction: Phytoplankton are autotrophic microscopic organisms that perform photosynthesis and live in oceans. Chlorophyll-a is the primary pigment present in phytoplankton and performs photosynthesis.
b.

Explanation of Solution
Estimating the concentration of phytoplankton in the ocean is a very tedious task, so the chlorophyll-a is considered as the index. An index is a substance that helps in calculating the number of other substances. In the given experiment, the chlorophyll-a is an index monitored by the wavelength of light absorbed by the water in the ocean. This pigment is only found in the phytoplankton of the ocean. A higher level of chlorophyll-a depicts a higher amount of phytoplankton in the ocean.
c.
To determine: The element that water lacks sampled in blue-dot plots.
Introduction: In the given experiment, the effect of iron on the growth of phytoplankton is determined. The blue dot represents the control experiment in which the nutrient is not added, while the sample having iron is represented by red dots.
c.

Explanation of Solution
The iron is a trace nutrient and plays a significant role in the growth of phytoplankton. It was observed that when the iron is added into the medium, the growth of phytoplankton increases. The blue dot symbolizes the condition of the water sample that does not have iron as a nutrient.
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Chapter 6 Solutions
BIOL 105 LIVING WORLD CONNECT CARD
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