1. the turning of all or part of an organism in a particular direction in response to an external stimulus.
2. Phototropism is a response to the stimulus of light, whereas geotropism (also called gravitropism) is a response to the stimulus of gravity . ... when the stem grows against the force of gravity, this is known as a negative geotropism.
3. Terrestrial plants direct their root systems downwards into the soil, mainly in response to the gravity vector; however, as the roots search for water and nutrients, they frequently change direction to avoid obstacles (thigmotropism). Root hydrotropism is a mechanism found in many species to avoid water stress.
Answer:Forms of tropism include phototropism (response to light), geotropism (response to. ... hydrotropism (response to water), thigmotropism (response to mechanical ...
Tropical and temperate rainforests have some things in common. Both have very dense vegetation. Trees in temperate and tropical rainforests have trunks that flare out at the bottom and both types of rainforests are endangered biomes.
