Understanding the Inverse Square Law in Regards to Light Intensity and Photosynthesis

The video tutorial explains how light intensity affects the rate of photosynthesis, highlighting that it is directly proportional to light intensity. It introduces the concept of direct proportion, where both variables increase at the same rate, and illustrates this with a graph. The tutorial also covers the inverse square law, explaining that light intensity decreases with the square of the distance from the light source. This means doubling the distance reduces light intensity to a quarter. The video concludes with a recap of these concepts, emphasizing the relationship between light intensity, distance, and photosynthesis.

What happens to the rate of photosynthesis when light intensity is doubled?

• It remains the same.

• It doubles.

• It triples.

• It halves.

Which of the following is NOT a limiting factor for photosynthesis?

• Light intensity

• Oxygen concentration

• Temperature

• Carbon dioxide concentration

According to the inverse square law, if the distance from the light source is doubled, what happens to the light intensity?

• It becomes twice as large.

• It becomes nine times smaller.

• It becomes four times smaller.

• It remains the same.

If a plant is moved from 0.1 meters to 0.2 meters from a light source, how does the light intensity change?

• It becomes nine times smaller.

• It becomes four times smaller.

• It remains the same.

• It becomes twice as large.

What is the relationship between light intensity and the square of the distance from the light source?

• Exponentially proportional

• Unrelated

• Inversely proportional

• Directly proportional