Commercial 'cork' is obtained from the plant

Options :
  1. Cinchona officinalis
  2. Juglans regia
  3. Cinnamomum zeylanicum
  4. Quercus suber


Answer and Explanation :-

Answer: Option 4

Explanation:

The cork of commerce is obtained from Quercus suber. In this plant the first phellogen persists indefinitely. The first formed periderm, called virgin cork, is removed when the tree is just 20 years old and about 40 cms in diameter. Subsequent phellogens proc=duce commercial cork layers more quickly and can be removed after a gap of every 10 years till the plant is about 150 years old.

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