Describe the transportation in plants.
Answers
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1-The movement of water travels along this route:
soil -> roots -> stem -> leaves -> air.
The movement of water throughout a plant driven by the loss of water through it’s leaves, or transpiration.
2-The movement of sugars in a plant is that Phloem translocates its sap from sugar sources to sugar sinks. carry food from a sugar source to a sugar sink.
• A sugar source is a plant organ (especially mature leaves) in which sugar is being produced by either photosynthesis or the breakdown of starch.
• A sugar sink is an organ (such as growing roots, shoots, or fruit) that is a net consumer or storer of sugar.
• Phloem sap flows from source to sink at rates as great as 1 m/hr, faster than can be accounted for by either diffusion or cytoplasmic streaming.
• Phloem sap moves by bulk flow driven by pressure.
• Higher levels of sugar at the source lowers the water potential and causes water to flow into the tube.
• Removal of sugar at the sink increases the water potential and causes water to flow out of the tube.
• The difference in hydrostatic pressure drives phloem sap from the source to the sink
• Plant transport of sugar occurs on three levels.
• At the cellular level across membranes, sucrose accumulates in phloem cells by active transport.
• At the short-distance level within organs, sucrose migrates from mesophyll to phloem via the symplast and apoplast.
• At the long-distance level between organs, bulk flow within sieve tubes transports phloem sap from sugar sources to sugar sinks.