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During secondary growth in a dicot root, cork cambium is formed by the activity of-
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Important Questions on Anatomy of Flowering Plants
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Which of the following statements about phelloderm are true?
I. It is a living tissue.
I. It is concerned with the conduction of water and salts.
III. It is a photosynthetic tissue.
The correct combination is
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Which of the following statements are the functions of a medullary ray in plants?
(i) Absorption
(ii) Secondary growth
(iii) Transmission of water and food
(iv) Seat of origin of inter-fascicular cambium
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(i) In monocot root, a large number of vascular bundles are arranged in the form of a ........ around the central ............
(ii) Due to the presence of ..........., the endodermal cells do not allow wall to wall movement of substances between cortex and pericycle, in a primary dicot root.
(iii) The epidermis of stem of sunflower bears several Unbranched ............... hair.
(iv) The central portion of a dicot stem is usually occupied by .............. comprising of thin-walled parenchymatous cells.
Select the option that correctly fills the blanks in any two of them.
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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 |
