For self-assessment questions, with exercises and discussions, just click on the correct topic at Biology GCSE & IGCSE Question Bank. The s-cool revision site lets you revise the topic, summarizes the topic & tests you on it. Skoool gives you a lesson, including progress questions, for each Biology topic but you’ll need sound on for it. GCSE Bitesize has revision pages (that take you through the topic), a test and an activity.
The only hormone we need to know about is adrenaline. Here GCSE Bitesize revises Hormones (7m 12s) in more detail than we need.
B7.2 TROPIC RESPONSES
We only need to know the first 28 slides:
Science Bank 15: Part 3 covers Plant Tropisms (from 9m 25s to 14m 30s):
A 3 minute introduction to tropisms (from Twig World).
Plant Control – Paul Andersen explains how plants use hormones to respond to their environment. We only need to know about auxins (to 3m 40s).