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Phloem Transport Video Lecture | Biology Class 11 - NEET

264 videos|514 docs|310 tests

FAQs on Phloem Transport Video Lecture - Biology Class 11 - NEET

1. What is phloem transport?
Ans. Phloem transport is the process by which sugars, nutrients, and other organic compounds are transported in plants. It occurs in the phloem tissue, which is responsible for conducting the products of photosynthesis from the leaves to other parts of the plant.
2. How does phloem transport work?
Ans. Phloem transport works through a mechanism called translocation. Sugars produced in the leaves are actively transported into the phloem sieve tubes. This creates a high osmotic pressure, causing water to enter the phloem from surrounding cells. This pressure pushes the sugar-rich sap through the phloem, allowing it to flow to other parts of the plant.
3. What are the main components of phloem tissue?
Ans. The main components of phloem tissue are sieve tubes, companion cells, phloem fibers, and phloem parenchyma. Sieve tubes are long, cylindrical cells that form a continuous tube for sap transport. Companion cells provide metabolic support to sieve tubes. Phloem fibers provide mechanical support, while phloem parenchyma stores starch and other substances.
4. How does phloem transport differ from xylem transport?
Ans. Phloem transport and xylem transport are two different processes in plants. Xylem transport is responsible for transporting water and minerals from the roots to the rest of the plant. In contrast, phloem transport moves sugars and other organic compounds from the leaves to other parts of the plant. Xylem transport is a passive process driven by transpiration, while phloem transport is an active process requiring energy.
5. What factors can affect phloem transport?
Ans. Several factors can affect phloem transport. Temperature, for example, can influence the rate of phloem sap movement, with higher temperatures generally increasing the speed. Hormones, such as auxins, can also affect phloem transport. Additionally, the source-sink relationship plays a crucial role, as the availability of sugars in the source and the demand in the sink determine the direction and rate of phloem transport.
264 videos|514 docs|310 tests
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