-Turgor pressure due to absorption of water keeps cells firm hence hold herbaceous plants upright.
-collenchyma and clerenchyma tissues are closely packed in stem and roots to provide support.
-inelastic cuticle on epidermis is covered by a waxy layer hence keeping shape of plant and setting inward pressure against turgid cells and this causes a force to hold plant upright.
-xylem vessels and tracheids are lignified to provide support to stems, roots and leaves.
-climbing plants obtain mechanical support from other plants and objects.
-they have climbing structures like tendrils which hold on to other objects.
Anganifelix answered the question on April 18, 2018 at 12:30
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