Question

There are many tissues produced outside the vascular cambium in the stem. Explain them

Answer 1

• Bark: The term 'bark' is commonly applied to all the tissue outside the vascular cambium of stem (i.e., periderm, cortex, primary phloem and secondary phloem).
• Bark protects the plant from parasitic fungi and insects, prevents water loss by evaporation and guards against variations of external temperature.
• It is an insect repellent, decay proof, fire proof and is used in obtaining drugs or spices.
• The phloem cells of the bark are involved in conduction of food while secondary cortical cells involved in storage.
•  if the phellogen forms a complete cylinder around the stem, it gives rise to ring barks.