In monocots, the specialization of the sieve elements has taken place in the following manner

Options :
  1. By gradual localization of sieve areas on the end walls
  2. By gradual change in the orientation of the end walls
  3. By gradual change in the structure of the sieve plate
  4. All of these
Answer and Explanation :-

Answer: Option 4

Explanation:

In addition, the specialization also takes place by the gradual reduction of the sieve areas on the side walls of the sieve tube elements

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