10 Questions
What is the main role of the sieve tubes in phloem tissue?
To transport sugars and other solutes
Which tissue is more complex based on the provided content?
Phloem
What is the primary component found in mature sieve elements?
P-Protein
Which process is described as movement of sugar from source to sink?
Translocation
What does 'short distance transport' of assimilates entail?
Movement of sugar from mesophyll cells to sieve elements
How is long distance transport defined in the context of assimilate transport?
Translocation of solutes from source to sink inside the sieve elements
Which of the following best describes the protoplasm in mature sieve elements?
Contains living protoplasm
Why is the transport of assimilates essential for plants?
To exchange metabolites among specialized organs and tissues
Which factor does not directly affect the process of assimilate transport?
Respiration
What are sieve plates in the context of phloem structure?
Perforated end walls of sieve elements
Study Notes
Translocation of Assimilates
- Assimilate transport is the process of exchanging metabolites among functionally specialized organs and tissues in plants.
- This process is essential to understand:
- The distribution of photosynthetic products in plants
- Their accumulation in storage organs
- Their mobilization during resumed growth
- The effect of climatic factors and farming practices on the above process
Definition and Types of Assimilate Transport
- Translocation is the process of sugar movement from source to sink in sieve tubes.
- There are two types of assimilate transport depending on the distance of transport:
- Short distance transport: movement of sugar from mesophyll cells to the vicinity of sieve elements in the smallest veins of the leaf, involving a distance of only one or three cells diameter.
- Long distance transport: translocation of sucrose and other solutes from source to sink inside the sieve elements.
Anatomy of Phloem Tissue
- Phloem tissue is more complex than xylem tissue.
- The main components of phloem are sieve tubes.
- Sieve tubes are composed of longitudinally arranged individual cells called sieve elements with perforated end walls called sieve plates.
- Sieve elements are living cells, but lack a nucleus and have a differentially permeable membrane.
- Sieve elements contain a fibrillar protein called P-Protein (Phloem protein).
This quiz covers the process of assimilate transport in plants, including phloem loading and unloading, and the distribution of photosynthetic products in plants.
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