Why does Selaginella fail to form seeds?

Even then the seeds are not formed in Selaginella because: 1. Megasporangium is not surrounded by integument. 2. The retention of megaspore permanently inside the megasporangium has not been well established.

Is seed present in Selaginella?

In Selaginella two types of spores, microspore and megaspore are present which are depend on parent sporophyte for the nutrition. This feature i.e. two type of spore have been considered as pre-requisites for the formation of seeds. This entire Page 2 structure, i.e., the integumented ovule is known as seed.

What is absent in leaf of Selaginella?

Because Selaginella has both microspores and megaspores, the plant is called heterosporous. They have a different type of leaf so it has heterophylly. The leaf bears on its upper surface near its base a small, membranous, tongue-like outgrowth called the ligule. So, the correct answer is option C.

Do bryophytes produce seeds?

Bryophytes produce spores, rather than seeds, and have no flowers.

What changes are required to make Selaginella a seed plant?

These are the basic requirements for seed habit:

• Evolution of heterospory.
• Reduction to a single functional megaspore per sporangium.
• Retention and germination of megaspore within the megasporangium.
• Development of protective layers and nutritive tissue around megasporangium.

How does Selaginella reproduce?

i. Vegetative Reproduction: The vegetative reproduction in Selaginella takes place by tubers (e.g., S. Bulbils and dormant buds are produced in aerial branches, while tubers may be aerial or underground. In favourable condition they germinate to produce new sporophytic plants.

Can a plant grow without its seed?

Plants can grow without producing seeds. There are two general ways for plants to reproduce. The second way is called asexual or vegetative reproduction where plants develop offshoots, suckers from the roots, or simply allow one of its branches to trail along the ground and develop roots wherever it touches the ground.

What is Selaginella stem?

Selaginella species are creeping or ascendant plants with simple, scale-like leaves (microphylls) on branching stems from which roots also arise. The stems are aerial, horizontally creeping on the substratum (as in Selaginella kraussiana), sub-erect (Selaginella trachyphylla) or erect (as in Selaginella erythropus).

What is a plant that produces seeds but not flowers?

The non-flowering plants that use seeds are called gymnosperms. Gymnosperm means “naked seeds”. They are called this because their seeds are open to the air with no covering such as the seeds of flowering plants. One of the major groups of gymnosperm plants is the conifer.

Do mosses produce seeds?

Mosses reproduce by spores, which are analogous to the flowering plant’s seed; however, moss spores are single celled and more primitive than the seed. Some mosses have cups on their tops that produce sperm, these are male plants. The female counterpart has eggs between her overlapping leaves.

Is Selaginella heterosporous or heterospory?

Because Selaginella has both microspores and megaspores, the plant is called heterosporous. Also know, which is Heterosporous? Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants.

What is the plant body of Selaginella?

The plant body of Selaginella is differentia­ted into well developed roots, stem and leaves. Besides, some species also have rhizophore (Fig.7.46A). Hieronymus (1902) divided the genus Selaginella into two sub-genera viz., Homoeophyllum and Heterophyllum on the basis of general structure of the plant body (Table 7.4).

How do you take care of Selaginella?

1. Watering: In general, Selaginella is sensitive to drying, but in particular, some of its species need continuous watering while some (poikilohydric plants) can tolerate dryness.

What is Selaginella uncinata?

Selaginella uncinata is native to the Gulf Coast of the United States. It grows only 2-3 inches from the ground with its oblong-shaped, paper-like, very delicate leaves.