Lecture 3 – Talking trees

Plants have to make a life-threatening choice between using their energy to grow, or communicate. Just like humans and other animals, they need to communicate, particularly when they are under threat.

When attacked by an animal, a plant will release lots of chemical 'signals' into the air. These signals are detected by other plants - their 'allies'. But although these chemical defence mechanisms might save them from being eaten, it uses up vital energy that could otherwise be used for growth.

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Copyright

© Channel 4

License

Courtesy of Channel 4

Production date

2009

Lecturer

Sue Hartley

Duration

48:05

All lectures in the series