The photosynthetically active parts of a plant are referred to as the source. The areas of active growth and areas of storage are referred to as sink.
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What is sink in plant?
Belowground organs of plants (e.g. roots and rhizomes) are sinks during plant growth since they cannot perform photosynthesis. Some organs are both a source and sink. Leaves are sinks when growing and sources when photosynthesizing.
What is a strong sink in biology?
‘Sink strength’ may be defined as the capacity of phloem in the sink region to import assimilates from other parts of the plants and to release the imported substances into the sink apoplast. A stem parasitized by Cuscuta represents a very strong sink.
What is sink and example?
Sink is defined as to go down slowly, or to drop beneath the surface or normal level. An example of to sink is to drop down to a D average in a class. An example of to sink is for a boat to go beneath the surface of the water. verb. The definition of a sink is a basin for water.
What is a sink cell?
The points of sugar delivery, such as roots, young shoots, and developing seeds, are called sinks. Sinks include areas of active growth (apical and lateral meristems, developing leaves, flowers, seeds, and fruits) or areas of sugar storage (roots, tubers, and bulbs).
What is a sink organ?
Sinks include any nonphotosynthetic organs of the plant and organs that do not produce enough photosynthetic products to support their own growth or storage needs. Roots, tubers, developing fruits, and immature leaves, which must import carbohydrate for normal development, are all examples of sink tissues.
Where is sink in the plant?
‘Sink’ refers to the part of the plant where the substrate can be stored (e.g. roots or stem for starch).
Is phloem a sink?
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.
Will a leaf sink or float?
The light source provides light energy, the solution provides water, and sodium bicarbonate provides dissolved CO2. Plant material will generally float in water. This is because leaves have air in the spaces between cells, which helps them collect CO2 gas from their environment to use in photosynthesis.
Is a seed a sink or a source?
Similarly, root is the only source of inorganic nitrogen (N), and mature leaves are often the major source for organic N, whereas the growing tubers/fruits/seeds are a sink for both inorganic and organic N (Table 1).
What is source and sink relationship?
Plant organs responsible for taking up a particular resource from the environment are known as the ‘source’ for that resource, whilst organs utilising the resource for growth, metabolism or storage are the ‘sink’ for that resource.
Are leaves sources or sinks?
Roots and young leaves are major sinks during the early developmental stages, whereas tubers, fruit and seeds become major sinks during the reproductive stages (Wardlaw, 1990).
Why is it called a sink?
What we call sinks are in fact ‘basins’ from which the water ‘sinks’. The term sink likely comes from the old English term ‘sincan’ – to become submerged, go under, or subside. Originally it referred to the place to where the contents of your basin would sink.
What is the full meaning of sink?
noun. Definition of sink (Entry 2 of 2) 1a : a pool or pit for the deposit of waste or sewage : cesspool. b : a ditch or tunnel for carrying off sewage : sewer. c : a stationary basin connected with a drain and usually a water supply for washing and drainage.
What is sink made of?
Bathroom sinks primarily are made from vitreous china and enameled cast-iron. Sturdy, heavy and durable, sinks made from these time-tested materials are built to last. Other materials include enameled steel, tempered glass, stone, wood, acrylic and solid surface.
How does a sink work?
Here’s how a sink works. Water comes into the system from the main water supply by the water supply tubes which run to the faucet. When the faucet opens, the water flows into the sink, down the drain, through the sink trap, and into the wastewater pipe in the wall that carries the water away.
What is the source and sink of sucrose?
Sucrose is transported from sources (mature leaves) to sinks (importing tissues such as roots, stems, fruits, and seeds) through the phloem tissues in veins.
Which are examples of source and sink cells in a plant?
Sources: Photosynthetic tissues – mature green leaves – green stems. Storage organs that are unloading their stores – storage tissues in germinating seeds – tap roots or tubers at the start of the growth session. Sinks: Roots that are growing or absorbing mineral ions using energy from cell respiration.
When would a storage organ be a sink?
oWhen the storage organ is stockpiling carbohydrates during the summer, it is asugar sink. oAfter breaking dormancy in the early spring, the storage organ becomes a sourceas its starch is broken down to sugar, which is carried away in the phloem to thegrowing buds of the shoot system.
Is fruit a source or sink?
A fruit is a sink because it produces very little of all the sugars it requires and depends on a source for all the inorganic nutrients it contains. Vegetables, e.g., spinach leaves are a different matter. Only young leaves are sinks, when they import sugars as well as nutrients.
What is phloem and xylem?
The vascular system is comprised of two main types of tissue: the xylem and the phloem. The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves. The phloem carries food downward from the leaves to the roots.
How does sugar move from a source to a sink?
At sinks, sugars are transported out of the phloem into surrounding cells. This withdrawal of sugars causes water to leave the sieve tube, again by osmosis, reducing turgor pressure at the sink end. It is the difference in turgor pressure that drives the movement of phloem sap from source to sink.
What is meant by source sink concept?
In crop plants, the physiological basis of dry matter production is dependent on the source-sink concept, where the source is the potential capacity for photosynthesis and the sink is the potential capacity to utilize the photosynthetic products.
Is ice sink in water?
Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top.
Does pencil float or sink?
ones that float: feather, Lego, bath toy, crayon, ping pong ball, plastic utensil, pencil, etc. Ones that sink: toy cars, coins, metal spoon, eraser, dry pasta, etc.