The Question is from neet-botany , and it was created by the author D VINOD

Question

Which of the following is NOT a characteristic of the phloem tissue involved in translocation?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Translocation in plants (specifically in phloem)
	**Related Topics**: Plant physiology, transport in plants, phloem structure and function, source-sink relationship
	**Prerequisites**: Basic understanding of plant tissues and their functions.
## SOLUTION PATHWAY
**Given Information**:
	The question asks for the characteristic that is NOT true for phloem involved in translocation.
**Method & Steps**:
	1. **Understanding Translocation**: Translocation is the transport of sugars (primarily sucrose) and other organic molecules from source (sites of production, like leaves) to sink (sites of storage or utilization, like roots, fruits, or growing parts). This process occurs in the phloem tissue.
	2. **Analyzing Phloem Characteristics**:
		* **Living cells**: Phloem is composed of living cells like sieve tube elements and companion cells, which are essential for active transport.
		* **Active process**: Translocation requires energy for loading and unloading sugars into and out of the sieve tubes, making it an active process.
		* **Bidirectional transport**: Phloem can transport sugars in both directions, although not simultaneously in the same sieve tube.  This allows for flexibility in supplying different sinks based on the plant's needs.
		* **Unidirectional flow in the whole phloem**:  This statement is incorrect. While the flow within a *single sieve tube* is unidirectional (from source to sink), the overall flow in the *entire phloem network* can be multidirectional, with different sieve tubes transporting sugars to different sinks.
	3. **Identifying the Incorrect Statement**: The statement 'Unidirectional flow in the whole phloem' is incorrect, making it the answer to the question.
	Result: D
	Verification: The other options (A, B, and C) accurately describe characteristics of phloem involved in translocation.
## OPTION ANALYSIS
[A] ✓: Bidirectional transport: Phloem sap can move up or down, depending on the location of source and sink. This is essential for supplying various parts of the plant with necessary nutrients.
[B] ✓: Living cells:  Sieve tube elements and companion cells are living cells crucial for the active transport mechanism of translocation.
[C] ✓: Active process: Translocation requires energy to move sugars against their concentration gradient, making it an active process.
[D] :x: Unidirectional flow in the whole phloem: While flow within a single sieve tube is unidirectional, the overall flow in the whole phloem can be bidirectional to accommodate the needs of different sinks.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing translocation with transpiration: Transpiration is the movement of water and minerals in xylem, while translocation is the movement of sugars in phloem.
		2. Assuming unidirectional flow in the whole phloem: Remember that while individual sieve tubes have unidirectional flow, the entire phloem network can exhibit bidirectional transport.
	**Quick Tips**:
		1. Remember the acronym 'STEC' for the components of phloem: Sieve tube elements, Companion cells.
		2. Visualize the phloem as a network of pipes transporting sugars in multiple directions, rather than a single pipe with unidirectional flow.

D VINOD · Answer

Bidirectional transport

D VINOD · Answer

Living cells

D VINOD · Answer

Active process

D VINOD · Answer

The correct Option is "Unidirectional flow in the whole phloem"

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