Question

Tunica corpus theory is connected with

• A. Root apex
• B. Root cap
• C. Shoot apex
• D. Secondary growth

Answer 1

The correct option is C Shoot apex

• The Tunica-corpus theory explains the planes of cell division in the shoot apex.
  
• It was proposed by Schmidt in 1924.
• It was proposed on the basis of the study of shoot apex.
• This theory is applicable only to shoot apex and not to root.
  
• This theory divides the region (shoot apex) into two tissue zones known as tunica and corpus.
• The shoot apex is composed of two layers of cells of tunica and corpus (layer L1, L2 and L3 to denote the outer layer of tunica, the inner layer of tunica and corpus respectively).
• The plasmodesmata connections exist between the cells of tunica and corpus.
• So, the correct answer is 'Shoot apex'