I: | Stem tendrils develop from axillary buds and help plants, such as pea, to climb |
II: | Opuntia modifies its stems into flattened structures to protect itself from browsing animals |
III: | Underground stems of some plants such as grass and strawberry spread to new niches and when older plants die, new plants are formed. |
1. | I, II, and III |
2. | Only II and III |
3. | Only III |
4. | Only I and III |