Why do fruit and vegetables grow larger in space than on Earth ?
It’s all down to gravity. Everything that lives or grows on Earth is adapted to life in a 1G environment. Take away that gravity and it will grow unrestrained, possibly to the point of it’s own destruction. A plant that grows in zero g would probably be OK, but a plant growing in a lunar lab would still have a small amount of gravity acting upon it. If it grows too tall in a lunar environment it could collapse under it own weight and die off. Even humans suffer in a low gravity living space. Many of our organs are suspended by ligaments and muscles, remove the gravity and those organs will be pulled higher up in the body than in normal gravity. This could cause problems in astronauts who have been a long time away from normal gravity. For example an astronaut going to Mars would be away for at least two years or more(6 months journey time, each way, at least 1 year waiting for Mars to be in a suitable position for a return journey), loss of regular activity would cause loss of calcium
