Question

what makes plants carry out photosynthesis whereas green coloured animals cannot

Answer 1

Vegetation will not appear to animals as it does to us. Although our color perception is the most advanced amongst mammals, humans have less effective color vision than many birds, reptiles, insects and even fish. Humans are trichromats, sensitive to three fundamental wavelengths of visible light. Our brains interpret color depending on the ratio of red, green and blue light. Some insects are able to see ultraviolet light. Birds are tetrachromatic, able to distinguish four basic wavelengths of light, sometimes ranging into ultraviolet wavelengths, giving them a far more sensitive color perception.

Answer 2

Plants are autotrophs,but animals are heterotrophs.
it means autotrophic organisms can make their own food. Heterotrophic organisms cannot make their own food