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The oldest phloem occurs on the outside of the phloem/inner to pericycle. It is actually
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Important Questions on Anatomy of Flowering Plants
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a. Vascular cambium arises from the sclerenchyma.
b. The cells of medullary cells, adjoining these interfascicular cambia become meristematic and form the intrafascicular cambium.
c. The tissues involved in secondary growth are the two lateral meristems: vascular cambium and cork cambium.
d. The growth of the roots and stems in length with the help of apical meristem is called primary growth.
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| I | II | ||
|---|---|---|---|
| (a) | Vessels | (i) | Cells are living, with thin cellulosic cell walls |
| (b) | Tracheids | (ii) | Cells possess highly thickened walls with an obliterated central lumen |
| (c) | Xylem fibres | (iii) | Individual members are interconnected through perforations in their common walls |
| (d) | Xylem parenchyma | (iv) | Elongated tube-like cells with thick, lignified walls and tapering ends |
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Given diagram shows -
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The dorsiventral leaf of the plant has
(a) Conspicuous cuticle present on both epidermis.
(b) Palisade tissue towards the abaxial epidermis and spongy parenchyma towards the adaxial epidermis.
(c) Bulliform cells in the adaxial epidermis.
(d) Vascular bundles surrounded by a layer of thick-walled bundle sheath cells.
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