Question

Secondary wall grows in thickness by

• A. Intercalation
• B. Introgression
• C. Accretion
• D. Epiboly

Answer 1

Answer: (C)

Accretion

• Accretion is the process by which gradual growth or enlargement takes place by the accumulation or adhesion of external parts.
  
• The secondary cell wall in plant cells grows by accretion or deposition of materials which are already present on the existing structure.
  
• So, the correct answer is 'Accretion'.