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

Question

Besides sucrose, which other carbohydrate is commonly transported in the phloem, particularly in some tree species during early spring?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Phloem transport of carbohydrates
	**Related Topics**: Plant physiology, carbohydrate metabolism, sugar alcohols
	**Prerequisites**: Basic understanding of plant transport systems and carbohydrate types.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about a carbohydrate besides sucrose transported in the phloem, especially in trees during early spring.
	Options include starch, cellulose, glycogen, and sugar alcohols.
**Method & Steps**:
	1. **Identify the primary carbohydrate transported in phloem:** Sucrose is the most common carbohydrate transported in the phloem of most plants.
	2. **Consider alternative transport molecules in specific situations:**  During early spring, some tree species utilize alternative carbohydrates for transport.  These are often sugar alcohols because they are readily soluble and can be easily mobilized.
	3. **Evaluate the options:**
		* Starch is a storage carbohydrate, not typically transported in the phloem.
		* Cellulose is a structural component of plant cell walls, not a transport carbohydrate.
		* Glycogen is a storage carbohydrate in animals and fungi, not plants.
		* Sugar alcohols (sorbitol, mannitol) are commonly transported in the phloem of certain tree species, especially during early spring when sucrose levels might be low.
	4. **Select the correct answer:** Sugar alcohols are the most appropriate alternative to sucrose for phloem transport in the given context.
		Result: Sugar alcohols (e.g., sorbitol, mannitol)
		Verification:  This aligns with established knowledge of plant physiology and the role of sugar alcohols in early spring transport in certain trees.
## OPTION ANALYSIS
A :x: Starch is a storage polysaccharide and not typically transported in the phloem.
B :x: Cellulose is a structural polysaccharide forming cell walls and is not transported in the phloem.
C :x: Glycogen is a storage polysaccharide found in animals and fungi, not plants.
D ✓: Sugar alcohols like sorbitol and mannitol are soluble and serve as alternative transport carbohydrates in some trees, particularly during early spring.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing transport carbohydrates with storage carbohydrates: Remember that transport carbohydrates are readily soluble and easily mobilized, unlike storage carbohydrates.
		2.  Overgeneralizing phloem transport: Recognize that while sucrose is the primary transport carbohydrate, exceptions exist depending on the plant species and environmental conditions.
	**Quick Tips**:
		1. Focus on the context – early spring and tree species – to narrow down the options.
		2. Remember the key roles of different carbohydrates in plants (transport, storage, structure).

D VINOD · Answer

Starch

D VINOD · Answer

Cellulose

D VINOD · Answer

Glycogen

D VINOD · Answer

The correct Option is "Sugar alcohols (e.g., sorbitol, mannitol)"

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