Sometimes bordered pit of gymnosperm are provided with arc like thickenings of primary wall and middle lamella on either side. These are called

Options :
  1. Crassulae
  2. Bars of Sanio
  3. Rim of Sanio
  4. All of these
Answer and Explanation :-

Answer: Option 4

Explanation:

Sometimes a bordered pit of gymnosperm is provided with arc like thickenings of primary wall and middle lamella on either side. They are called crassulae. When these thickening are rod like, they are called bars or rim of Sanio

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