Dicot Leaf vs Monocot Leaf (Difference between Dorsiventral and Isobilateral Leaf)
Dicot leaves are also called as dorsiventral leaves because they possess distinct dorsal and ventral sides. Monocot leaves are called isobilateral leaves since both the sides of monocot leaves are more or less similar. Dicot and monocot leaves show considerable differences both in their morphological and anatomical characteristics.
The present post discusses the Difference between Dicot and Monocot Leaf with a Comparison Table.
Heartwood vs Sapwood (Similarities and Differences between Heartwood and Sapwood)
Anatomically, wood is the secondary xylem of seed-plants. As the tree ages, certain permanent changes take place in the wood. The inner parts of the wood become darker. The xylem in this central part is called heartwood or ‘duramen’. The peripheral part of the wood is light coloured and it is called sapwood or ‘alburnum’. The sap conduction occurs through the sapwood.
The dark colour of heartwood is due to the accumulation many aromatic substances, pigments and tannins. These changes make the wood more strong and durable and resistant to decay by insect or fungal attacks. The inner heartwood provides the mechanical support.
The present post discusses the similarities and differences between heartwood and soft wood with a comparison table.
Similarities between Heartwood and Sapwood
Ø Both are composed of secondary xylem formed after many years of secondary growth.
Collateral vs Bicollateral Vascular Bundles (Similarities and Differences between Collateral and Bicollateral Vascular Bundles)
Vascular bundles are the distinct structural organization vascular tissues (xylem and phloem) and the formation of vascular bundles is one of the advanced characteristics of higher plants. In the stem of seed plants, the vascular tissue (xylem and phloem) occupy together as vascular bundles. However, in roots the xylem and phloem are not associated together and not form the vascular bundles. Such an arrangement of vascular tissue in root is called radial arrangement.
In the previous post we have discussed the Structure and Classification of Vascular Bundles. Based on the relative position and number of phloem strands in vascular bundles, the conjoint vascular bundles are classified into two groups: (1). Collateral vascular bundles and (2) Bicollateral vascular bundles.
(1). Collateral vascular bundle: A type of conjoint vascular bundle where the xylem occupies inner to a single strand of phloem. Example: dicot stem and monocot stem.
(2). Bicollateral vascular bundles: A type of conjoint vascular bundle where the xylem is situated in the middle of two phloem strands. Example: stem of Cucurbita, Cephalandra (members of Cucurbitaceae Family).
The present post describes the similarities and differences between the collateral and bicollateral vascular bundles in plants with a comparison table.
Similarities between Collateral and Bicollateral Vascular Bundles
Ø Both are conjoint vascular bundles (xylem and phloem occupy together as bundle).
Ø Both are present in the stem.
Ø Both contain only one xylem strand.
Ø Xylem is endarch in both the groups.
Difference between Collateral and Bicollateral Vascular Bundle
Fascicular vs Inter-fascicular Cambium (Similarities and Differences between Fascicular and Interfascicular Cambium)
Cambium is a strip of meristematic cells present between the xylem and phloem in dicot plants. The primary function of the cambium is to produce the vascular tissue and hence it is called the ‘Vascular Cambium’. The vascular bundles found in the primary plant parts are also called as Fascicles.
The vascular cambium produces xylem towards the inner side and phloem towards the outer side in both stem and roots. There are two types of vascular cambium in dicot plants based on its position; they are (1) Fascicular Cambium and (2) Interfascicular Cambium.
(1). Fascicular cambium:
The cambium present between the xylem and phloem of a vascular bundle is called fascicular cambium. The fascicular cambium is also called as intrafascicular cambium since they are present inside the vascular bundle. In the beginning, the fascicular cambium is a primary meristem, later during the secondary growth; it gets transformed into a secondary meristem.
(2). Interfascicular cambium:
The cambium occupy between two vascular bundles is called interfascicular cambium. It is a secondary meristem.
During the secondary growth in a dicot stem, the fascicular and interfascicular cambium fuse together to form a continuous ring of meristematic tissue called the Vascular Cambium. The vascular cambium cut-off the secondary xylem towards its inner side and secondary phloem towards its outer side.
The present post describes the similarities and differences between Fascicular and Interfascicular Cambium.
Similarities between Fascicular and Inter-fascicular cambium
Ø Both fascicular and interfascicular cambia are meristematic cells.
Ø Both are the part of vascular cambium.
Ø Both can produce xylem towards the inner side and phloem towards the outer side.
Ø Both are actively dividing cells.
Difference between Fascicular and Interfascicular Cambium