An experiment is conducted in which pea seeds are planted 10 mm apart in tray I and 1 cm apart in tray II. Both trays are exposed to the same environmental conditions. It is noted that plants grown in tray I are very weak while plants in tray II are healthy.
AThe plants compete for limited available resources
BThe plants are not exposed to sufficient sunlight
CThe plants are grown in nutrient deficient soil
DThe plants suffered a pathogen attack
but 10 mm is equal to 1 cm !!