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(a) Root hairs/ roots absorbs water by osmosis; cells of plants become turgid; leaves become firm hence spread out; plant becomes firm hence upright or assume an erect posture.
(b) (i) Collenchyma
(ii) Xylem i.e. tracheid and vessels/ sclerenchyma
johnmulu answered the question on May 24, 2017 at 12:44
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