What is the difference between a Megaphyll and microphyll?
Microphylls are defined as leaves of small size, with simple venation (one vein) and associated with steles that lack leaf gaps (protosteles). By contrast, megaphylls are defined as leaves of generally larger size, with complex venation and associated with leaf gaps in the stele [3].
Are megaphylls and microphylls homologous?
Microphylls and megaphylls are two types of leaf structures, which occur in vascular plants. They are not homologous structures. Moreover, they differ from each other by means of leaf veins and leaf gaps.
How did Megaphyll leaves evolve?
According to the telome theory, megaphylls evolved from the three-dimensional lateral branches of early vascular land plants in a hypothetical series of three transformations; first, the formation of determinate lateral branches (overtopping); second, the development of ‘flattened’ branch systems (planation); and third …
Are megaphylls true leaves?
Vascular tissues (xylem, phloem) help transport materials within the plant. Early vascular plants had dichotomous branching. Stems were photosynthetic, with no true leaves. Pterophytes developed larger leaves (megaphylls) with branching veins.
What are Microphyll leaves give example?
Microphyll meaning A leaf with only one vascular bundle and no complex network of veins. Horsetails and lycophytes (such as club mosses) have microphylls. Microphylls on modern plants are generally small but in extinct phyla the same structures could grow quite large.
What are microphylls megaphylls and Sporophylls?
A sporophyll is a leaf that bears sporangia. In heterosporous plants, sporophylls (whether they are microphylls or megaphylls) bear either megasporangia and thus are called megasporophylls, or microsporangia and are called microsporophylls.
Are microphylls vascularized?
Leaf vasculature Microphylls contain a single vascular trace.
Is a Microphyll a true leaf?
Leaves produced by mosses and liverworts are not true leaves because they do not have a vascular strand. Stems of microphyllous plants do not have a leaf gap – and their vascular tissue is generally very simply arranged.
Where Microphyllous leaves are found?
Microphyllous leaves are produced inPteridium It is one of them on common types of leaf which is found only in some primitive plants. the morphology of the microphyllous leaf is slightly different and unconventional as compared to other types of leaves. There is slight Kinks on the surface of of the leaf.
What is sporophyll give example?
(v) Sporophyll – It is a leaf that bears sporangia. They may be microsporophyll or megasporophyll. Sporophyll aggregate to form cones or strobili. Example: Sporophyll of fern, Microsporophyll and megasporophyll of Selaginella.