BotanyWhich one of the following secondary tissues is resistant to the attacks of microbes and insects?

Which one of the following secondary tissues is resistant to the attacks of microbes and insects?

  1. A

    Secondary cortex

  2. B

    Secondary phloem

  3. C

    Sap wood

  4. D

    Heart wood

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    Solution:

    Heart wood is resistant to attacks of insects and microbes due to deposition of essential oils, tannins, oils gums and resins. Sap wood, secondary phloem and secondary cortex are susceptible to the microbial and insect attacks. 

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