False, xylem fibres are mainly supportive in function. Xylem parenchyma stores food and helps in sideways conduction of water.

Small holes on the epidermis of the leaf are called stomata. They are surrounded by two kidney-shaped cells called guard cells.

(i) Ice (ii) Wood (iii) Soil (iv) Air

Product Z is formed by the combination of X and Y, thus having a greater mass than X and Y separately. Furthermore, Z is a completely new product, thus cannot show the same properties as X and Y.

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