- 4) Geotropism- Roots grow towards the pull of gravity
- 2) Thigmotropism-shoots of climbing plants e.g. ivy wind round other plants for support
- 3) Phototropism- shoots grow towards the light enabling photosynthesis
- 1) Chemotropism-Pollen tubes are attracted by chemicals and so move down the style towards the ovary where fertilisation takes place
- Plants respond to biotic (living) and abiotic (non living components in their environment. This can help the plant avoid stress, being eaten and so is able to reproduce.