Question

why plants have more dead tissues when compared to animals

Answer 1

plants don't move ... that is they are sedentary and require less energy ... the dead cells provide mechanical support to stay upright.... and since they are dead hence don't need maintenance like living cells...hence plants have more dead cells
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Answer 2

Plants need the hard, dead cells to remain upright – they don’t have skeletons, and each cell must support itself or receive direct support from tissues around it, in order for the plant to remain upright. Most plant tissues are dead, since dead cells can provide mechanical strength as easily as live ones and therefore need less maintenance. Also, plants are stationary and hence require less energy. Animals require energy for movement. Animals are supported by hard (often bony) skeletons and do not need dead cells to support them.

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