Answer:
HERBACEOUS PLANTS• Support is provided by the turgidity of parenchyma & collenchyma cells & xylem tissues. Parenchyma cells are filled with water turgid• Collenchyma cells have unevenly thickened cellulose walls which provide support in stem & the midrib of the leaves.
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I would say b or at least that’s what it was on my test
B.4 When the diameter doubles the volume eight times and the surface four times would be increased so that's why the answer is 4
They use Geothermal Energy, which is used from plants to generate electricity.