Question

a student was studying how a change in abiotic factors can influence living organisms. she set up the experiment as follow: 1. fill two glass fish tanks, labeled tank a and tank b, with 5 liters of water each. 2. add a small fish and several plants to each tank. 3. seal both tanks so that no air can leave or enter. 4. place tank a in a bright room and tank b in a dark room. the student noticed after 45 hours, the fish in tank b died while the fish in tank a remained healthy. based on the results of the experiment described above, what explains how an abiotic factor can affect a biotic factor in an ecosystem? lack of light caused the plants to be unable to do photosynthesis. the number of plants in the tank affected the amount of fish. the amount of light affected the temperature of the water in the tank. fish are primary consumers and eat plants to survive.

Explanation:

In the experiment, the key difference between the two tanks is the presence or absence of light. Light is an abiotic factor. Plants in Tank B, with no light, couldn't perform photosynthesis. Photosynthesis is crucial for plants to produce oxygen and organic compounds. Without it, the oxygen - producing process in Tank B stopped, leading to the death of the fish due to lack of oxygen. The other options are either not the main factor in this experiment or not relevant to the impact of the abiotic factor (light) on the biotic factor (fish).

Answer:

A. Lack of light caused the plants to be unable to do photosynthesis.