AP BIOLOGY

Detailed explanation-1: -The survival of terrestrial plants depends upon the capacity of roots to obtain water and nutrients from the soil. Directed growth of roots in relation to a gradient in moisture is called hydrotropism and begins in the root cap with the sensing of the moisture gradient.

Detailed explanation-2: -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.

Detailed explanation-3: -The direction of early root growth is not coincidental and has been defined as hydrotropism, or growth (or movement) of an organ towards water or towards soil with a higher water potential (Takahashi, et al., 1997). In watermelon (Citrulus lanatus (Thunb.) Matsum.

Detailed explanation-4: -In tropism, the response of the organism is often by its growth rather than by its movement. It may grow either towards or away from the stimulus. Hydrotropism is a form of tropism characterized by the growth or movement response of a cell or an organism to moisture or water. The response may be positive or negative.

Detailed explanation-5: -1. Movement of plants in response to water is called hydrotropism. In this case, water is a stimulus to which the plant can show two responses. 2. It can move towards the water source-Positive hydrotropism.