Are non vascular plants Homosporous?

Are non vascular plants Homosporous?

Seedless, non- vascular plants produce only one kind of spore and are called homosporous. The gametophyte phase (1n) is dominant in these plants. After germinating from a spore, the resulting gametophyte produces both male and female gametangia, usually on the same individual.

What plants have a Homosporous life cycle?

plants. A homosporous life history occurs in nearly all bryophytes and in most pteridophytes (lower vascular plants). It is characterized by morphologically identical spores that germinate to produce bisexual (both male and female) gametophytes in pteridophytes but either bisexual or, more usually, unisexual…

Do ferns have a heterosporous life cycle?

Heterospory refers to an adaptation seen in later-evolved plants–all seed plants and some ferns–in which spores develop in two different sizes and complete separate reproductive functions.

Are all bryophytes Homosporous?

Bryophytes are homosporous. They produce similar kinds of spores, which either germinate into unisexual or bisexual gametophytes.

Are vascular plants heterosporous?

While all bryophytes are homosporous, several lineages of vascular seedless plants as well as the entire seed plant lineage have evolved heterospory (Bateman and DiMichele, 1994).

What plants are heterosporous?

Because the two spores produce different types of gameotphytes, They are called heterosporous, a feature found only in a few species of ferns, , and all of the seed plants (i.e., gymnosperms and angiosperms).

What are Homosporous and heterosporous plants?

Plants that are homosporous produce spores of the same size and also type. Heterosporous plants produce spores of two different sizes which are the larger spore called the megaspore, functioning as a female spore and the smaller spore known as the microspore that functions as a male spore.

What is Heterospory give example?


Is the fern Homosporous or heterosporous?

Ferns are mostly homosporous, though some are heterosporous. The heterosporous state is a more advanced condition, that seems to have evolved independently in several groups of plants. The haploid spores are formed by meiosis inside the sporangium.

Which one of the following plants is not heterosporous?

Heterospory is the production of two different types of spores by the sporophytes of land plants. Of all the options given in the question Selaginella, Pinus and Cycas all produce micorspores and megaspores for reproduction. However, Pteridium on the other hand is homosporous.

Are bryophytes heterosporous?

Bryophytes are not heterosporous. They are homosporous – which means they produce spore of only one kind.

How are bryophytes Homosporous?

Homosporous is a condition in which identical spores, the same sized spores are produced. Such morphologically identical spores grow into bisexual gametophytes in some of the members (monoecious plants). Hence, in the homosporous condition, all spores would be of the same type.

Which one of the following is example of Homosporous and heterosporous plants respectively?

Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous pteridophytes Lycopodium and Equisetum are homosporous pteridophytes.

Which of the following are examples of heterosporous pteridophytes?

Selaginella, salvinia are examples of heterosporous pteridophytes.

Which pteridophytes are heterosporous?

Examples of Heterosporous Pteridophytes

  • Selaginella.
  • Marsilea.
  • Salvinia.
  • Isoetes.
  • Azolla.
  • Stylites.
  • Pilularia.
  • Platyzoma.

Which plants are heterosporous?

Which is heterosporous fern?

Heterosporous are the plants which can produce two different types of spores. The two type of spores are the meagspores and the microspores. The megapsores are the female gametes which are larger in size. The microspores are the male gametes which are smaller in size. Salvinia is an aquatic fern.

What is Homospory example?

Definition of homospory : the production by various plants (such as the club mosses and horsetails) of asexual spores of only one kind.

Is Cycas is heterosporous?

Pinus and Cycas, which are gymnosperms, are also heterosporous.

Which of the following is not Homosporous Fern?

Option A is the correct answer. Option B: Selaginella, Salvinia, Lycopodium and Pteris- Selaginella as we discussed shows both the spores hence, it cannot be homosporous.

What is the difference between homospory and heterospory pteridophytes?

Pteridophytes or ferns belong to the class of vascular plants. Depending on the life cycle of the pteridophytes, it can undergo alternation of generation based on homospory or heterospory. Homospory is a phenomenon in which only one type of spore can be seen.

What is a haplodiplontic life cycle?

This type of life cycle is called a haplodiplonticlife cycle (Figure 20.1). It differs from our own diplonticlife cycle, in which only the gametes are in the haploid state.

Which generation is the dominant generation In heterosporous pteridophytes?

The resulting plants are dioecious due to the heterosporous nature of these plants. The gametophytes are depending on the sporophytes for nutrition. Therefore, the sporophytic generation is the dominant generation in heterosporous pteridophytes. Examples of heterosporous pteridophytes are Selaginella, Marselia etc.

How many types of sporangia occur in homosporous pteridophytes?

Only one type of sporangia occurs in Homosporous pteridophytes. Two types of sporangia occur in heterosporous pteridophytes, that is microsporangia and megasporangia. Homosporous pteridophytes produce only one type of gametophyte containing both male and female parts.