The Question is from neet-botany anatomy-of-flowering-plants , and it was created by the author K SURESH KUMAR

Question

In which specific cellular location are the informational molecules, such as RNA and proteins, that are transported via the phloem, synthesized?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Phloem transport and cellular synthesis of informational molecules.
	**Related Topics**: Plant cell structure, protein synthesis, RNA synthesis, translocation.
	**Prerequisites**: Basic understanding of plant cell types and their functions, knowledge of phloem's role in transport.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the synthesis location of RNA and proteins transported via the phloem.
	Options include sieve elements, companion cells, phloem parenchyma cells, and xylem parenchyma cells.
**Method & Steps**:
	1. Identify the role of each cell type.
		Reasoning: Sieve elements are primarily responsible for conducting phloem sap.  Companion cells are metabolically active and closely associated with sieve elements. Phloem parenchyma cells have various functions including storage. Xylem parenchyma cells are part of the xylem and do not directly participate in phloem transport.
		Formula/Rule: None directly applicable.
	2. Determine which cell type is most likely to synthesize the informational molecules.
		Working: Companion cells are metabolically active and have the necessary cellular machinery (ribosomes, etc.) for protein and RNA synthesis.  They support the sieve elements, which lack many organelles.
		Key Point: The synthesis of these molecules needs to occur in a cell capable of active metabolic processes.
	3. Select the correct option.
		Result: Companion cells are the primary site of synthesis for the informational molecules transported in the phloem.
		Verification: The close association of companion cells with sieve elements and their high metabolic activity supports this conclusion.
## OPTION ANALYSIS
A :x: Sieve elements lack the necessary organelles for significant protein and RNA synthesis.
B ✓: Companion cells are metabolically active and synthesize proteins and RNA that are then transported to sieve elements.
C :x: Phloem parenchyma cells have storage and other functions, but not the primary role in synthesis of these transport molecules.
D :x: Xylem parenchyma cells are unrelated to phloem transport.
## LEARNING AIDS
	**Common Mistakes**:
		1.Confusing the roles of sieve elements and companion cells: Remember that sieve elements primarily transport, while companion cells synthesize and support.
		2.Ignoring the metabolic activity requirement for synthesis:  Synthesis requires energy and the machinery found in metabolically active cells.
	**Quick Tips**:
		1. Focus on the metabolic activity of the different cell types.
		2. Remember the close relationship and functional interdependence of sieve elements and companion cells.

K SURESH KUMAR · Answer

Sieve elements

K SURESH KUMAR · Answer

The correct Option is "Companion cells"

K SURESH KUMAR · Answer

Phloem parenchyma cells

K SURESH KUMAR · Answer

Xylem parenchyma cells

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