Question

a researcher is studying java moss, a plant species from southeast asia that only grows below the waters surface. it is a tropical plant that grows best when temperatures are between 20 to 30 °c. when it gets outside of that temperature range, sugar production decreases. the researcher decides to change different parameters in the experiment to see the effects on the photosynthesis in the java moss. read the change and indicate if it would lead to an increase or decrease in photosynthesis. increase in photosynthesis decrease in photosynthesis carbon dioxide is bubbled into the water close to the plant. the water temperature is set to 15 °c. water plants are added on top of the water that block light. the light duration is increased by 2 hours.

Explanation:

Step1: Recall photosynthesis requirements

Carbon - dioxide is a reactant in photosynthesis. Adding more carbon - dioxide will increase the rate of photosynthesis.

Step2: Consider temperature effect

The optimal temperature range for Java moss is 20 - 30°C. 15°C is outside this range, so photosynthesis will decrease.

Step3: Analyze light obstruction

Adding water plants that block light will reduce the light available for photosynthesis, causing a decrease.

Step4: Evaluate light duration

Increasing light duration provides more energy for photosynthesis, leading to an increase.

Answer:

Carbon dioxide is bubbled into the water close to the plant: Increase in Photosynthesis
The water temperature is set to 15°C: Decrease in Photosynthesis
Water plants are added on top of the water that block light: Decrease in Photosynthesis
The light duration is increased by 2 hours: Increase in Photosynthesis