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(a) Write two water conducting tissues present in plants. How does water enter continuously into the root xylem?(b) Explain why plants have low energy needs as compared to animals.
(a) Xylem tracheids and xylem vessels are water-conducting tissues (vascular tissue) as part of the xylem present in plants. Xylem is responsible for the conduction of water from the roots to other parts of the plant.
Due to transpiration and the resulting pressure gradient, water is absorbed into the root xylem of plants. The transpirational pull formed causes the roots to absorb water from the soil and resulting in the transportation of water.
(b) Plants have low energy needs as compared to animals due to the following reasons:
(i) Plants are autotrophic organisms, preparing their own food absorbing solar energy during the process of photosynthesis.
(ii) Plants don't move from one place to another like animals so they consume less energy.
(iii) Also, plants possess many dead cells in terms of sclerenchyma cells that do not require much energy for maintenance.
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