Option 1: Ultraviolet and Blue light

Ultraviolet light is not effective for photosynthesis as it has too much energy and can be harmful to plants. Blue light, on the other hand, is a part of the visible spectrum and is known to be important for photosynthesis. It is absorbed by chlorophyll, the pigment responsible for capturing light energy.

Option 2: Blue and Red light

This is the correct answer. Blue and red light are both crucial for photosynthesis to occur. Blue light is absorbed by chlorophyll, and red light is also absorbed by chlorophyll but to a lesser extent. These two colors of light have the right energy levels to drive the chemical reactions in the plant cells that convert carbon dioxide and water into glucose and oxygen.

Option 3: Green and Yellow light

Green and yellow light are not as effective for photosynthesis as they are reflected rather than absorbed by chlorophyll. This is why plants appear green, as green light is not utilized by the plant for photosynthesis.

Option 4: Blue and Green light

Green light is not very effective for photosynthesis as mentioned above. Therefore, option 4 is also not the correct answer.

In summary, blue and red light are the most effective for photos