Home of real teaching & learning
  • Full support for teachers
  • Focus on critical thinking
  • Engaging classroom activities
  • Integrated student eBook
  • Assessed tasks / qBank
  • Practice exam questions
Find out more Download brochure

The InThinking Guarantee: Our sites are written by expert practitioners and not by AI

See our AI policy

Disclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.

Don't miss out, find out!

Phytohormones (2025)

Phytohormones are signalling chemicals that control growth and development in plants. Auxin is one, and the mechanism by which it acts is quite complex, but it is a good illustration of the role of membrane proteins and the fluid nature of the plasma membrane. This will be considered first and then the interaction between auxin and cytokinin considered. Finally, the ripening of fruit using ethylene is discussed....

Help