If you want to make a name for yourself and perhaps even win a Nobel prize, solve the problem of how cells differentiate. I love the inclusion of asymmetric division in our book. Most cell division chapters in books lead you to think that all meristematic cell divisions produce equal-sized derivatives. Some books even state that unequivocally. They are wrong.
Asymmetric divisions are necessary and very important.
The section on plant hormones is very near and dear to my heart. This later part of growth is also still uncharted territory. There is a lot of room for people like you to make your own mark in science. The author points out several areas where there is room for you to add to our knowledge. This chapter is an area that is very open to research.