Does Lycopodium have dichotomous branching?
Does Lycopodium have dichotomous branching?
Lycopodium lucidulum: Note the Vertical Stem. The Roots are adventitous and originate in the stem. They branch Dichotomously. Shoot tip of L.
Does Lycopodium have dominant sporophyte?
Gametophyte Morphology This trend of sporophyte dominance throughout the evolutionary timeline of plants leads to continually smaller, less complex gametophytes. Gametophytes of this group are seldom seen. In Lycopodium, the gametophyte grows from a homospore and is bisexual, producing both antheridia and archegonia.
Is Isoetes Dichotomously branched?
The roots are dichotomously branched, bearing numerous root hairs. of the root of Isoetes shows a single- layered epidermis, followed by 4-8 layered parenchymatous cortex.
Are Lycophytes gametophyte dominant?
As with all plants, lycophytes have two alternating generations. The dominant generation in lycophytes is the sporophyte generation which produces spores for reproduction. The gametophyte is small and insignificant compared to the sporophyte and it often grows in close association with fungi.
Does Lycopodium have secondary growth?
Isoetes differs from both Selaginella and Lycopodium in the occurrence of secondary growth in the stem and the possession of a definite root-producing meristem. The sets of roots arise in a definite sequence, in contrast to the more or less irregularly produced roots of all other extant lower vascular plants.
Is Lycopodium Strobilus Homosporous or heterosporous?
Lycopodium is homosporous–all spores are roughly equal in size. Selaginella and Isoetes are heterosporous–spores are of two distinct sizes, microspores and megaspores.
Is Lycopodium a Sporophyte or gametophyte?
Lycopodium leaves are small and arranged spirally around the stem. Sporophyte is the dominant generation of Lycopodium. Gametophyte is one kind. It is a bisexual gametophyte which is a prothallus.
Is Lycopodium spp Homosporous or heterosporous?
What is Monopodial and dichotomous branching?
(A) Monopodial branching in which the SAM produces leaves and axillary branches on its flank, and all branching is lateral to the main shoot. (B) Dichotomous branching in which the SAM subdivides into two new meristems, each of which carries on plant growth.
What is dichotomous branch?
The division of the apical meristem into two independently functioning axes is defined as dichotomous branching. This type of branching typically occurs in non-vascular and non-seed vascular plants, whereas in seed plants it presents a primary growth form only in several taxa.
What do Megaphylls do?
Megaphylls are the other leaf structures that occur in vascular plants. Generally, the main function of both microphylls and megaphylls is to undergo photosynthesis. In comparison, the main structural feature of megaphylls is the presence of multiple veins. Also, they contain leaf gaps.
What is the type of branching in Lycopodium?
As in Lycopodium, branching is usually dichotomous. The sporophyte may consist of several upright branches from a rhizome, prostrate branches creeping along the surface of the soil, or large, flat, erect, frondlike side branches from strong rhizome systems. The entire branch system often resembles a fern leaf.
What is sympodial dichotomy?
In other cases, after the bifurcation of the tip, one half grows normally while the other half is practically suppressed. This is called sympodial dichotomy as this type of branching gives rise to a false axis formed of the bases of successive branches (sympodium) just as in the case of uniparous cymose branching.
How to prepare slide of strobilus of Lycopodium?
Prepared Slide of Strobilus of Lycopodium: Take this slide and hold it to the light. It was made from a longitudinal slice through a strobilus (compare with strobili on the living and/or pressed plants). Place the slide under the microscope and look for the following: the central stem serving as the axis for the structure; the
What is spore formation in Lycopodium?
Spore Formation:- In Lycopodium, the spores are formed in a specialized reproductive structure known as strobili (singular : Strobilus) or cone. Each strobilus is a slender structure, sessile or stalked, simple, un-branched or dichotomously branched, arising at the apex of the stem or branches.
