A) dicot leaves
B) monocot leaves
C) xerophytic stem
D) hydrophytic stem
Correct Answer: A
Solution :
Mesophyll is formed by the bulk of internal tissue of leaf enclosed by upper and lower epidermis. In dicots, the leaves are dorsiventral (bifacial) and mesophyll cells are differentiated into palisade, and spongy parenchyma. In most of the monocots, the leaves are isobilateral. Mesophyll cells are isodimetric and there is hardly any differentiation of mesophyll into palisade and spongy parenchyma. Most xerophytes possess one to many cell thick sclerenchymatous hypodermis in the stem. The hypodermis may be in patches or extends in the form of a continuous sheet. The excessive thickning of the walls of xerophytes is due to accelerated conversion of polysaccharides into cellulose and other materials, which are induced by depleted or lessened supply of water in the cells. In submerged form hydrophytes, stem is very weak and flexible so that it can move according to water current. Epidermal cells are without cuticle, certain groups of specialised cells are present in the epidermis of many submerged plants which are specifically concerned with absorption. These localized groups of epidermal cells are called hydropoten.
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