1.These additional copies speed up the heat-loss process so the plants can more quickly return to using energy to grow.
speed up(使)加速;开快车;加紧
Action had been taken to speed up the release of cheques.
已经采取行动加速支票的发放 。
2.They have genetically modified part of the mechanism in plants that is responsible for photosynthesis.
responsible for为…负责
I feel partly responsible for the problems we're in.
我觉得应为我们遭遇的问题负部分责任 。