Factors Affecting Photosynthesis

Factors Affecting Photosynthesis

Read each question carefully and answer to the best of your ability. This worksheet will test your knowledge about the factors that influence photosynthesis.

Understanding Photosynthesis

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll. This process converts light energy into chemical energy, which is stored in glucose. The main ingredients for photosynthesis are carbon dioxide and water, and the byproducts are oxygen and glucose.

1. Which of the following is NOT a necessary ingredient for photosynthesis?

2. What is the primary energy source for photosynthesis?

1. The green pigment in plants that absorbs sunlight is called  .

2. Plants take in   from the atmosphere for photosynthesis.

3. The sugar produced during photosynthesis is called  .

1. Increasing light intensity always increases the rate of photosynthesis.

2. Photosynthesis can occur in the dark if all other conditions are met.

1. Explain how increasing carbon dioxide concentration affects the rate of photosynthesis. What happens if there is too little CO2?

2. Describe the effect of temperature on the rate of photosynthesis. Why is there an optimal temperature range?

Use the words below to complete the sentences.

1. The rate of photosynthesis increases with light intensity up to a certain point, after which another   might be restricting the rate.

2. Plants produce   as their food source during photosynthesis.

3. The best temperature for photosynthesis is called the   temperature.