HORTICULTURE

Detailed explanation-1: -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).

Detailed explanation-2: -The growth of plant roots toward water and soil is an example of positive hydrotropism. Now that we have discussed what tropisms are and a couple of examples of different tropisms, we can answer our question.

Detailed explanation-3: -The roots show positive geotropism because root always moves towards the ground in the direction of gravity. Roots are negatively phototropic and positively hydrotropic.

Detailed explanation-4: -In comparison, relatively little is known about hydrotropism, the directional growth of plant roots towards a water source. Plant roots are able to perceive a water potential gradient in their surroundings and change the direction of the root tip through differential growth in the elongation zone.

Detailed explanation-5: -The movement or the growth of a plant in relation to the stimulus of water is called hydrotropic movement and the equivalent response to the stimulus of water is called hydrotropism. In this type of movement, roots show positive hydrotropic response, as they move and grow towards the water.