Multiple choice Who discovered that only the green parts of plants can carry out photosynthesis? Helmont Joseph Priestley Ingen-Housz Jean Senebier Reveal answer Fill a bubble to check yourself C Correct answer Explanation Ingen-Housz was a Dutch physiologist, biologist and chemist. He is best known for showing that light is essential to photosynthesis and thus having discovered photosynthesis. He also discovered that plants, like animals have cellular respiration.