Question

photosynthesis in action
a group of students designs an experiment to study photosynthesis in a hydrilla plant. the students place the plant in a beaker filled with pond water and trapped inside a glass funnel. the students collect data after two hours. figure 1 shows a diagram of the experiment.
figure 1. experiment diagram
bubble formation
pond water
hydrilla
support to keep funnel off the bottom
table 1 shows the results of the experiment.
table 1. experiment results
observation description

1. the amount of air at the top of the test tube

hydrilla can negatively impact fish populations by depleting oxygen levels in the water. based on the passage, how does hydrillas respiration contribute to lower oxygen levels in the water?
hydrilla undergoes aerobic respiration at night, releasing oxygen and consuming carbon dioxide.
hydrilla produces large amounts of oxygen at night, lowering oxygen demand.
hydrilla absorbs excess oxygen during the day, reducing available oxygen at night.
hydrilla undergoes aerobic respiration at night, consuming oxygen and releasing carbon dioxide.

Explanation:

During aerobic respiration, organisms consume oxygen and release carbon - dioxide. Hydrilla, like other plants, undergoes aerobic respiration at night when photosynthesis (which produces oxygen) is not occurring. This consumption of oxygen by hydrilla's respiration leads to lower oxygen levels in the water.

Answer:

Hydrilla undergoes aerobic respiration at night, consuming oxygen and releasing carbon dioxide.