Distinguish between the following: Protoxylem and metaxylem.
(N/A) The differences between protoxylem and metaxylem are as follows:
| Feature | Protoxylem | Metaxylem |
| :--- | :--- | :--- |
| Formation | It is the first-formed primary xylem. | It is the later-formed primary xylem. |
| Maturation | It matures before the growth and differentiation of plant organs. | It matures after the growth and differentiation of plant organs. |
| Vessel Diameter | It has vessels with a smaller diameter. | It has vessels with a larger diameter. |
| Tyloses | Tyloses are generally absent. | Tyloses are generally present. |
| Fibres | Xylem fibres are typically absent. | Xylem fibres are typically present. |
| Feature | Protoxylem | Metaxylem |
| :--- | :--- | :--- |
| Formation | It is the first-formed primary xylem. | It is the later-formed primary xylem. |
| Maturation | It matures before the growth and differentiation of plant organs. | It matures after the growth and differentiation of plant organs. |
| Vessel Diameter | It has vessels with a smaller diameter. | It has vessels with a larger diameter. |
| Tyloses | Tyloses are generally absent. | Tyloses are generally present. |
| Fibres | Xylem fibres are typically absent. | Xylem fibres are typically present. |
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View SolutionStar-shaped crystals found in $Dioscorea$ are known as:
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View SolutionMatch the Column-$I$ with Column-$II$ and choose the correct option:
Column-$I$ (characteristics of vascular bundle) Column-$II$ (Transverse section) $A$. Radial,tetrarch,cambial ring between xylem and phloem at later stages $i$. $T.S$ of monocot stem $B$. Conjoint,open and endarch $ii$. $T.S$ of dicot root $C$. Radial,Polyarch,large pith without cambial ring $iii$. $T.S$ of monocot root $D$. Conjoint,closed with sclerenchymatous bundle sheath $iv$. $T.S$ of dicot stem
| Column-$I$ (characteristics of vascular bundle) | Column-$II$ (Transverse section) |
| $A$. Radial,tetrarch,cambial ring between xylem and phloem at later stages | $i$. $T.S$ of monocot stem |
| $B$. Conjoint,open and endarch | $ii$. $T.S$ of dicot root |
| $C$. Radial,Polyarch,large pith without cambial ring | $iii$. $T.S$ of monocot root |
| $D$. Conjoint,closed with sclerenchymatous bundle sheath | $iv$. $T.S$ of dicot stem |
Match the following:
Column-$I$ Column-$II$ $(a)$. Hypodermis in dicot stem $(i)$. Absent $(b)$. Pericycle in dicot stem $(ii)$. Parenchymatous $(c)$. Ground tissue in monocot stem $(iii)$. Collenchymatous $(d)$. Phloem parenchyma in monocot stem $(iv)$. Sclerenchymatous
| Column-$I$ | Column-$II$ |
|---|---|
| $(a)$. Hypodermis in dicot stem | $(i)$. Absent |
| $(b)$. Pericycle in dicot stem | $(ii)$. Parenchymatous |
| $(c)$. Ground tissue in monocot stem | $(iii)$. Collenchymatous |
| $(d)$. Phloem parenchyma in monocot stem | $(iv)$. Sclerenchymatous |
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View SolutionSelect the correct options from the following:
$(i)$ Sapwood / Heartwood appears dark brown in color.
$(ii)$ Generally,pith is absent in Dicot root / Monocot root.
$(i)$ Sapwood / Heartwood appears dark brown in color.
$(ii)$ Generally,pith is absent in Dicot root / Monocot root.
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