Question

Which of the characters are found in the cells producing primary tissues?
(i) Rich in protoplasm, conspicuous nucleus.
(ii) Thick cell walls, few plasmodesmatal connections.
(iii) Thin cell wall, many plasmodesmatal connections.
(iv) Lignin in cell wall, inconspicuous nucleus.

• A. (i), (ii)
• B. (i), (iv)
• C. (i), (iii)
• D. (iii), (iv)

Answer 1

The correct option is C (i), (iii)

• Primary meristematic tissues are derived from the promeristem or the embryonic meristem.
  
• They are active cells which divide continuously and later form the permanent tissues (epidermis, primary xylem and phloem).
• The cells of these tissues are roughly spherical or polyhedral or rectangular in shape and have thin cell walls.
  
• They have a dense cytoplasm with a prominent nucleus.
  
• They have a thin cellulosic cell wall with no secondary cell wall and have plasmodesmata (a thread of cytoplasm that connects the adjacent cells which pass through their cell walls).
  
• So, the correct answer is 'i) and iii)'.