Question

Students conducted an experiment to determine the effect of light intensity on the rate of photosynthesis. They punched 40 leaf disks from spinach leaves and used a syringe partially filled with water to pull the gases from the leaf disks so that all leaf disks sunk to the bottom of the syringe. Ten (10) leaf disks from the syringe were placed in each of four cups and covered with 50 ml of the solutions as indicated below. All leaf disks were resting on the bottom of the cups when the experiment began. The volume of liquid in each cup and the temperature of the solutions were held constant. All cups were placed 0.5 meters from the designated light source. A large beaker of water was placed between the light and the cups to act as a heat sink to prevent a change in temperature. At the end of 10 minutes, the number of disks floating in each cup was recorded.Use your knowledge of the mechanism of photosynthesis and the data presented in the chart to determine which of the statements below is a correct explanation for the student's data.A) Cup 2 had the highest rate of photosynthesis because 5 disks were floating at the end of 10 minutes using a 50 watt light bulb.B) Cup 1 had a low rate of photosynthesis because 0.5 grams of baking soda did not provide a sufficient amount of CO2.C) Cup 3 had the same rate of photosynthesis as Cup 1 because they had the same ratio of disks floating to wattage of light.D) Cup 4 had the slowest rate of photosynthesis because it had the least baking soda.

Answer 1

D

Step-by-step explanation:

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Answer 2

Option D is correct

Cup 4 had the slowest rate of photosynthesis because it had the least baking soda.

Step-by-step explanation:

The data for the experiment is attached to this solution of the question.

Oxygen produced during photosynthesis makes the leaves float like bubbles in water. This indicates the link between the number of leaves floating and the rate of photosynthesis.

All the components necessary for photosynthesis are provided. The light source provides light energy, the solution provides water, and baking soda provides dissolved CO2.

From the data, it is evident that cups 1 and 3 have the fastest rate of photosynthesis with similar number of leaves floating after 10 minutes on a per wattage basis. (3/25) and (9/75) both give 0.12 leaves floating per wattage.

Cup 2 follows closely with 5 leaves floating in 10 minutes for a wattage of 50 leading to a floating leaves per wattage basis of (5/50); 0.1

But cup 4, with no amount of leaves floating in 10 minutes for a wattage of 75 has evidently the slowest rate of photosynthesis and this is because there isn't any baking soda provided in it at the start of the experiment.

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