AP BIOLOGY

Detailed explanation-1: -In sink tissues such as roots, pollen and fruits, the plant can absorb the sugar either as sucrose or, after cleavage, as the monosaccharides glucose and fructose. Uptake of glucose and other monosaccharides is driven by STPs that move sugar through the otherwise impermeable cell membrane using an acid gradient.

Detailed explanation-2: -Glucose is used by plants for energy and to make other substances like cellulose and starch. Cellulose is used in building cell walls. Starch is stored in seeds and other plant parts as a food source.

Detailed explanation-3: -Plant roots are able to absorb sugars from the rhizosphere but also release sugars and other metabolites that are critical for growth and environmental signaling. Reabsorption of released sugar molecules could help reduce the loss of photosynthetically fixed carbon through the roots.