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

Question

Which tissue is responsible for the primary growth of plants, increasing their length and girth?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant growth and meristematic tissues
 **Related Topics**: Apical dominance, primary and secondary growth, types of meristems
 **Prerequisites**: Basic understanding of plant anatomy and tissue types.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the tissue responsible for primary growth (increase in length and girth).
  Options are different types of meristematic tissues and ground tissue.
**Method & Steps**:
 1. Identify the types of meristems and their roles.
  Reasoning: Meristems are regions of actively dividing cells responsible for plant growth.  Different meristems contribute to different aspects of growth.
  Formula/Rule:  None directly applicable, this is a conceptual understanding question.
 2. Determine which meristem is responsible for primary growth.
  Working:  Apical meristems are located at the tips of roots and shoots, causing primary growth (increase in length).  Lateral meristems (vascular cambium and cork cambium) are responsible for secondary growth (increase in girth in woody plants). Intercalary meristems are found in grasses and contribute to stem elongation at the nodes.
  Key Point: Primary growth is about lengthening the plant body, while secondary growth is about thickening it.
 3. Select the correct option.
  Result: Apical meristems are the primary drivers of primary growth, increasing both length and (to a lesser extent) girth.
  Verification: The other options are incorrect because lateral meristems are for secondary growth, intercalary meristems are for specific growth in grasses, and ground tissue is not directly involved in growth.
 ## OPTION ANALYSIS
A ✓: Apical meristem is responsible for primary growth, increasing the length of roots and shoots.  It also contributes to the initial increase in girth, particularly in herbaceous plants.
B :x: Lateral meristems are responsible for secondary growth (increase in girth in woody plants), not primary growth.
C :x: Intercalary meristems contribute to the growth of grasses at the nodes, but not the primary growth of most plants.
D :x: Ground tissue forms the bulk of the plant body but is not directly involved in the growth process itself.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing primary and secondary growth: Remember that primary growth is about length, secondary about girth.
  2.Overlooking the role of apical meristems in girth increase: While less significant, apical meristems do contribute to initial girth increase.
 **Quick Tips**:
  1.Associate apical with apex (tip) for remembering its location and role in length increase.
  2.Remember that lateral meristems are responsible for the ‘lateral’ increase in girth.

NISHANTH · Answer

The correct Option is "Apical meristem"

NISHANTH · Answer

Lateral meristem

NISHANTH · Answer

Intercalary meristem

NISHANTH · Answer

Ground tissue

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