A botanist is designing a water-efficient vertical garden for a city building. Which simple permanent tissue should be mainly used to provide both support and flexibility to withstand wind?
Collenchyma
Collenchyma is a simple permanent tissue made of living, elongated cells whose walls are unevenly thickened with cellulose and pectin, especially at the corners.
This uneven thickening gives young stems and leaf petioles mechanical support while still allowing the tissue to bend, twist and stretch, which is exactly what is needed to withstand wind.
Sclerenchyma is dead and rigid, so it gives strength but no flexibility. Parenchyma is thin-walled and mainly stores food. Epidermal tissue is a protective outer covering, not a support tissue.
Hence, collenchyma is the tissue that provides both support and flexibility in a vertical garden exposed to wind.
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