Explain the life history of lycophytes, Biology

Assignment Help:

Explain the Life History of Lycophytes?

Lycophytes have two separate and distinct generations in their life history that alternate with each other. The gametophyte stage is tiny, colorless, and grows in and on the soil. It is haploid (1n) in terms of chromosome number, and produces sexual reproductive structures called male antheridia and female archegonia. Water must be present for sperm to fertilize an egg in an archegonium, and as such, the sperm have flagellae. Upon fertilization, the embryo, which is now 2n, and the beginning of the sporophyte generation, develops within the archegonium on the gametophyte generation.

Eventually, the sporophyte develops into an independent generation and produces the green leafy plants that we recognize as a lycopod. The leaves formed are called microphylls. Specialized microphylls become sporophylls, bearing sporangia. When clustered tightly together in a modified cone structure, they are called a strobilus, plural - strobili. The sporangium undergoes meiosis to form 1n, or haploid, spores. These spores upon release, germinate into the tiny gametophyte stage to repeat the cycle.

 


Related Discussions:- Explain the life history of lycophytes

Complete blood count, One may find leucocytosis with predominant polymorpho...

One may find leucocytosis with predominant polymorphonuclear cellular response in patients of ARF in presence of acute some throat. Throat Culture When patient presents as AR

Flaws in developmen of human, Flaws in Developmen of Human The human ...

Flaws in Developmen of Human The human growth and development in spite of its complexity works perfectly most of the time. But while development goes awry it creates a giant

General process of post-hatching growth in insects, General process of post...

General process of post-hatching growth in insects While a young insect hatches out from an egg it is covered by a firm, inflexible, sclerotized cuticle, which because of its

Explain creaming volume formulae - performance evaluation, Performance Eval...

Performance Evaluation Cake batter aeration can be affected by the plasticity, consistency, emulsification, bake stock formulation and other fats and oil properties.  Creamin

Explain about pre-market approval application, Question 1: Show the pro...

Question 1: Show the procedures for filing a 510(k) application and a Pre-market approval application for medical devices in the USA. Show out the procedures for filing a

What are worm infections, Q. What are worm infections? The Worm infecti...

Q. What are worm infections? The Worm infections are human diseases caused by nematodes(roundworms) or platyhelminthes (flatworms).

Tectology ia the study of structural organization of body, Tectology:  Thi...

Tectology:  This is the study of structural organization of body. Tectology is a term which is used by Alexander Bogdanov to describe a discipline which consisted of unifying all

What are deciduous trees, What are deciduous trees? The Deciduous trees...

What are deciduous trees? The Deciduous trees are plants that lose their leaves in a period of the year and in the case of the deciduous trees of the temperate forest the fall

Messenger rna (mrna), Messenger RNA (mRNA) are the proteins are not synthe...

Messenger RNA (mRNA) are the proteins are not synthesized directly from the genomic DNA. Insteadof that an RNA template (a precursor mRNA) is constructed from the sequence of gene

Define hypoglycaemia, Let us now understand the definition, causes, signs a...

Let us now understand the definition, causes, signs and symptoms, diagnosis and treatment of hypoglycaemia. It is very important for you to learn about it because patient will be h

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd