Question

using science skills
a student prepared two beakers with identical sprigs of a water - plant as shown below. she placed one beaker in the shade and the other beaker beside a fluorescent lamp. she then systematically changed the distance of the beaker from the lamp. she counted the bubbles given off by each sprig of the water - plant. shown here is the graph of the data for the beaker she placed in the light.

1. according to the graph, at what distance from the light source was the greatest number of bubbles produced?

a. 0cm b. 5cm c. 10cm d. 25cm e. 30cm

1. if the student later tested the air bubbles collected in the test tube, what gas would she find in the bubbles?

a. oxygen b. water c. methane d. carbon dioxide

1. what can you conclude from the students data?

a. more intense sunlight decreases the rate of photosynthesis
b. more intense sunlight increases the rate of cellular respiration
c. more intense sunlight decreases the rate of cellular respiration
d. more intense sunlight increases the rate of photosynthesis

1. what does this picture represent?

a. active transport b. facilitated diffusion c. osmosis d. diffusion

Explanation:

Step1: Analyze the graph for question 36

By observing the graph, the highest number of air - bubbles is at 5 cm from the light source.

Step2: Recall photosynthesis for question 37

During photosynthesis, water plants produce oxygen gas which is released as bubbles.

Step3: Interpret the data for question 38

As the distance from the light source (less intense light) increases, the number of bubbles (rate of photosynthesis) decreases. So more intense sunlight increases the rate of photosynthesis.

Step4: Identify the process for question 39

The picture shows the movement of molecules against the concentration gradient with the use of ATP, which is active transport.

Answer:

1. b. 5cm
2. a. oxygen
3. d. more intense sunlight increases the rate of photosynthesis
4. a. active transport