By studying the fertilised seeds of corn, scientists from the University of Colarado Boulder have discovered a form of plant altruism.
A corn seed contains an embryo and corresponding bit of tissue called endosperm, which feeds the the embryo as the seed grows.
The study found fertilised seeds sharing the same mother and father were heavier than those with an embryo and endosperm from genetically different parents.
This suggests an endosperm is more likely to cooperate and share more food with a genetically related embryo.
Read more at University of Colarado Boulder