DENDROLOGY

Detailed explanation-1: -Gravitropism. It is a type of tropism where plants show some growth in response to gravity. Stems are negative to the gravitropism while roots are positive to the gravitropism. This is also referred to as geotropism.

Detailed explanation-2: -The stem of a plant moves upwards against the direction of gravity, so the stem of a plant shows negative geotropism.

Detailed explanation-3: -Gravitropism. Plant parts tend to either grow in the same direction as gravity, or in the opposite direction. This type of tropism is called gravitropism. For example, the roots of most plants exhibit positive gravitropism when they grow downward.

Detailed explanation-4: -Plant parts can grow with or against gravity. This type of tropism is called gravitropism. Roots of a plant grow downward and exhibit positive gravitropism. Stems, on the other hand, exhibit negative gravitropism since they grow upwards and against the force of gravity (see Figure 1).