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What is the primary function of the Phloem in plants?
Transport of water
Transport of food
Storage of starch
Support
Transport of food
Phloem is a complex permanent tissue in plants responsible for the translocation of organic nutrients, primarily sucrose, from the leaves to other parts of the plant. This process ensures that energy is distributed to tissues like roots, fruits, and growing stems.
Phloem is a complex permanent tissue in plants responsible for the translocation of organic nutrients, primarily sucrose, from the leaves to other parts of the plant. This process ensures that energy is distributed to tissues like roots, fruits, and growing stems.
Think of the phloem as a biological highway system for 'take-out food' delivery, where the leaves are the kitchens (source) and the roots/fruits are the hungry customers (sinks).
Phloem = Phood (Food); Xylem = Xylophone (Water/Up-only)
╬иwтАЛ=╬иsтАЛ+╬иpтАЛ тАФ The water potential equation that drives the osmotic movement of sap.
The movement of solutes occurs through the Pressure-Flow Hypothesis. Sucrose is actively loaded into sieve-tube elements, creating a hypertonic environment that draws water from the xylem by osmosis. This builds up high turgor pressure at the source (leaves), which forces the sap to move towards areas of lower pressure (sinks), where the sugar is unloaded.
Phloem is composed of sieve tube elements, companion cells, phloem parenchyma, and phloem fibers.
Unlike xylem, which transports water in one direction, phloem transport is bidirectional.
The primary sugar transported in phloem is sucrose, a non-reducing sugar.
Allows plants to store energy in specialized organs like tubers and seeds.
Enables plant growth in areas distant from the photosynthetic sites.
Agricultural crop management regarding fruit yield.
Understanding of plant metabolism and systemic distribution of herbicides/pesticides.
| Feature | Xylem | Phloem |
|---|---|---|
Transport Direction | Unidirectional (Upward) | Bidirectional (Up/Down) |
Xylem consists of dead cells at maturity (tracheids and vessels), whereas phloem sieve elements are living.
Option A refers to Xylem; Option C refers to storage parenchyma; Option D refers to collenchyma or sclerenchyma.
B is correct тАФ Phloem serves as the primary vascular tissue for the translocation of photosynthetically produced food materials.
Always remember the mnemonic 'Phloem for Food' to instantly distinguish it from Xylem, which is for water, during high-speed RRB examinations.
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