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

Question

In which of the following plants does the stem perform the primary function of photosynthesis?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: 2 (*Opuntia*)
## CONCEPT FRAMEWORK
 **Primary Concept**: Photosynthesis in modified plant structures
 **Related Topics**: Plant morphology, adaptations to arid environments, stem succulence
 **Prerequisites**: Basic understanding of photosynthesis and plant anatomy.
## SOLUTION PATHWAY
**Given Information**:
  Four plant species: *Ficus*, *Opuntia*, *Hibiscus*, *Mangifera* are given as options.
  The question asks which plant's stem primarily performs photosynthesis.
**Method & Steps**:
 1. Identify plants with modified stems for photosynthesis.
  Reasoning:  Many plants have adapted to harsh environments by modifying their stems to perform photosynthesis.  This is often seen in succulent plants.
  Formula/Rule:  None directly applicable; this is a knowledge-based question.
 2. Analyze the characteristics of each option.
  Working: 
   * *Ficus* (Fig tree):  Has typical leaves that are the primary photosynthetic organs.
   * *Opuntia* (Prickly pear cactus):  Has flattened, succulent stems (cladodes) that are green and perform most of the photosynthesis.
   * *Hibiscus*:  Has typical leaves that are the primary photosynthetic organs.
   * *Mangifera* (Mango tree): Has typical leaves that are the primary photosynthetic organs.
  Key Point:  The presence of chlorophyll in the stem is a key indicator of photosynthetic activity.
 3. Determine the plant with the stem primarily responsible for photosynthesis.
  Result: *Opuntia* is the only plant listed where the stem is the primary site of photosynthesis.
  Verification:  The flattened, green stems of *Opuntia* are clearly adapted for photosynthesis, unlike the other options which have leaves as their main photosynthetic organs.
 ## OPTION ANALYSIS
A :x: *Ficus* has leaves as the primary photosynthetic organ.
B ✓: *Opuntia* has modified stems (cladodes) that are the primary photosynthetic organ.
C :x: *Hibiscus* has leaves as the primary photosynthetic organ.
D :x: *Mangifera* has leaves as the primary photosynthetic organ.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing stem modifications with other plant structures:  Students might mistake thorns or tendrils for photosynthetic stems.
   How to avoid: Carefully examine the function and structure of the stem in question.
  2.Assuming all plants photosynthesize primarily in leaves:  Many plants have adaptations that alter the primary photosynthetic organ.
   How to avoid: Learn about various plant adaptations to different environments.
 **Quick Tips**:
  1.Look for green, flattened stems (cladodes) as an indicator of photosynthetic stems.
  2.Remember that succulent plants often have stems adapted for water storage and photosynthesis.

K SURESH KUMAR · Answer

*Ficus*

K SURESH KUMAR · Answer

The correct Option is "*Opuntia*"

K SURESH KUMAR · Answer

*Hibiscus*

K SURESH KUMAR · Answer

*Mangifera*

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