NEET BIOLOGY

Detailed explanation-1: -Sinks also include sugar storage locations, such as roots, tubers, or bulbs. At the end of the growing season, the plant will drop leaves and no longer have actively photosynthesizing tissues. Early at the start of the next growing season, a plant must resume growth after dormancy (winter or dry season).

Detailed explanation-2: -Sink cells are any cells that unload sucrose from the phloem. Sink cells are found throughout the plant, but are abundant in roots or developing fruits and shoot tips. Sink cells typically cannot meet their own needs for carbohydrates and must import them from the phloem.

Detailed explanation-3: -For example, a sink may be growing roots that absorb minerals by active transport and, therefore, require sugars to release energy. A sink may also be meristem cells, which actively divide at the tip of the shoot or root. Sinks can also be storage organs, such as developing fruits.

Detailed explanation-4: -In plants, the root is a typical sink organ that relies exclusively on the import of sugar from the aerial parts. Sucrose is delivered by the phloem to the most distant root tips and, en route to the tip, is used by the different root tissues for metabolism and storage.

Detailed explanation-5: -The storage organs already mentioned are sinks during their formation but are destined to become sources. The phloem itself is often considered to be a sink, although only a minor one in relation to the other sinks of the plant.