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Zorluk: OrtaPlant Biology and Photosynthesis

A potato plant synthesizes sugars in its foliage and transports that energy downward to develop underground storage tubers. What is the correct chronological sequence of this physiological pathway from initial carbon fixation to long-term energy storage?

  1. 1Chloroplasts in leaf mesophyll cells produce glucose through photosynthetic reactions.
  2. 2Glucose molecules are converted into soluble sucrose and loaded into phloem sieve tubes.
  3. 3Hydrostatic pressure drives the sugar solution downward through the vascular stem toward sink tissues.
  4. 4Subterranean tuber cells unload sucrose and polymerize it into insoluble starch granules.

Cevap

The correct sequence begins with glucose production in leaf chloroplasts, followed by sucrose loading into the phloem, bulk flow transport downward through the vascular system, and concludes with starch synthesis in underground tuber storage cells.
The biological process follows a logical source-to-sink progression: green leaves act as the source by manufacturing glucose via photosynthesis, which is converted to sucrose and actively loaded into phloem sieve tubes. Hydrostatic pressure pushes the sap downward through the stem to the sink, where tuber cells absorb the sugar and link it into starch granules for compact energy storage.

Adım Adım Çözüm

1
Identify the source where carbohydrate synthesis begins.
Leaf chloroplasts convert solar energy and carbon dioxide into glucose.
Plant metabolism starts with primary production in photosynthetic organs.
2
Identify the preparation and loading stage for vascular transport.
Glucose converts into sucrose and is loaded into phloem elements.
Sucrose is the primary stable carbohydrate used for systemic transport in plants.
3
Identify the mechanism of movement through the plant body.
Sap flows through phloem along a hydrostatic pressure gradient from source to sink.
Translocation distributes nutrients from leaves down toward roots and growing tubers.
4
Identify the final conversion at the sink tissue.
Tuber cells take up sucrose and assemble it into insoluble starch.
Storage organs store excess energy as compact, insoluble starch molecules.

Anahtar Kavram

Carbohydrate Source-to-Sink Translocation and Storage
Tahmini Süre:1m 0s
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Konular

Plant Biology and Photosynthesis

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