In which pteridophytes, hetersporous is produced?a)Adiantumb)Equisetumc)Psilotumd)SalviniaCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Pteridophytes are mainly homosporus but some are heterosporous also like seleginella,  salvinia, marcilea ,azola. homosporus  means they produce identical spores, where as in heterosporous pteridophytes they produce two types of spores microscope ,which are small male spores and megaspore which are large females spore

Answer

Heterospory is the production of spores of two different sizes and of two different developmental patterns -smaller male or microspores and larger female or megaspores. Heterospory is the most important evolutionary development in vascular plants because it has ultimately led to seed development, e.g., Selaginella, Salvinia, Azolla, etc

Answer

Heterospory refers to the production of two types of spores, namely microspores and megaspores, by a plant. These two types of spores give rise to separate male and female gametophytes, respectively. Heterospory is a characteristic feature of certain groups of pteridophytes.

The correct answer to the question is option 'D', Salvinia.

Here is a detailed explanation of why Salvinia is heterosporous:

Salvinia is a genus of aquatic ferns that belong to the family Salviniaceae. It includes several species of floating aquatic ferns that are commonly found in ponds, lakes, and slow-moving water bodies. Salvinia is a heterosporous fern, which means that it produces two types of spores.

1. Microspores:
Salvinia ferns produce small microspores. These microspores are produced in structures called microsporangia, which are located on the lower surface of specialized leaves known as sporocarps. Each microsporangium contains several microspores. Microspores are haploid, which means they have only one set of chromosomes.

2. Megaspores:
Salvinia ferns also produce larger megaspores. These megaspores are produced in structures called megasporangia, which are also located on the lower surface of the sporocarps. Each megasporangium contains a single megaspore. Megaspores are also haploid.

The microspores and megaspores are released from their respective sporangia and are dispersed in the environment. When conditions are favorable, the microspores and megaspores germinate and give rise to male and female gametophytes, respectively.

The male gametophyte develops from a microspore and produces male gametes called antherozoids. The female gametophyte develops from a megaspore and produces female gametes called eggs. Fertilization occurs when an antherozoid fertilizes an egg, resulting in the formation of a diploid zygote. The zygote develops into a sporophyte, which is the main plant body of the fern.

In conclusion, Salvinia is a heterosporous fern that produces both microspores and megaspores. This adaptation allows for the development of separate male and female gametophytes, ensuring sexual reproduction in the species.

Answer

Pteridophytes are mostly homosporous. But there are some exception which are heterosporous... one of those is Salvinia.

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