Which of the following is the gametangia surrounded by a sterile jacket?
Bryophytes are higher order spore producing organisms and therefore contain a jacket made of sterile cells surrounding the gametangia. Therefore, this is the correct option.
What is multicellular gametangia?
(a) Multicellular gametangia – gamete producing structures that surround the reproductive cells and developing embryos with water trapping layers of cells.-
What are sterile jacket cells?
A sterile jacket tissue is characteristic of male and female sex organs (gametangia) in the embryophyta where encloses and protects the gamete producing cells. The antheridia of the Charales are very complicated; they produce sperm, which fertilize the egg cell within the oogonium.
What is the name of female gametangia?
archegonia
Female. Female gametangia are most commonly called archegonia. They produce egg cells and are the sites for fertilization. Archegonia are common in algae and primitive plants as well as gymnosperms.
What is gametangia in bryophytes?
The gametophyte is the dominant life phase in the Bryophytes. The gametophyte produces structures known as antheridia and archegonia, which produce the male and female gametes respectively. Collectively these structures are known as gametangia.
What is the function of gametangia in plants?
Gametangia are structures that produce haploid gametes, or sex cells. In plants, the gametes are eggs and sperm. The type of gametangium that produces the egg is called an archegonium, whereas the type of gametangium that produces the sperm is called an antheridium.
What are the two types of gametangia?
Terminology. The female gametangium, a haploid structure that produces female gametes or eggs. The male gametangium, a haploid structure that produces numerous male gametes or sperm.
What are sterile cells?
Sterile cells means which have the lost their property of reproduction.
What is jacket in biology?
The protein coat is made up of protein subunits called capsomere. Additional layer of lipid molecules may envelope the protein coat. Synonym(s): capsid (virology)
How is gametangia produced?
Gametangium Definition
Gametangium is a reproductive organ present in seedless plants like bryophyte and pteridophytes as well as in fungi. They produce gametes by mitosis. Gametangia are produced in the multicellular haploid gametophyte. They prominently occur in seedless plants.
Do all plants have gametangia?
Gametangia are prominent in seedless plants, but are very rarely found in seed plants.
What is the male gametangia called?
antheridia
cellular reproduction
In oogamy, the male gametangia are called antheridia and the female oogonia or archegonia.
What does sterile mean biology?
1 : failing to produce or incapable of producing offspring a sterile hybrid — compare infertile. 2 : free from living organisms and especially microorganisms a sterile syringe a sterile cyst.
What is sterile infection?
Sterile inflammation occurs in the absence of microorganisms and is typically associated with the recognition of intracellular contents released from damaged and necrotic cells (also known as damage-associated molecular patterns) by inflammatory signalling receptors.
What are protein coats?
noun. Biology (in microbiology) the coiled or polyhedral structure, composed of proteins, that encloses the nucleic acid of a virus; capsid.
What type of spores are in bryophytes?
Spores of bryophytes are generally small, 5–20 micrometres on the average, and usually unicellular, although some spores are multicellular and considerably larger. Spores have chlorophyll when released from the sporangium. They are generally hemispheric, and the surface is often elaborately ornamented.
What is the role of the gametangia?
Gametangia (singular, gametangium) are organs observed on multicellular haploid gametophytes. In the gametangia, precursor cells give rise to gametes by mitosis. The male gametangium (antheridium) releases sperm.
What is the example of sterile?
The definition of sterile is something totally clean and free from bacteria, a living thing that is not able to reproduce sexually and create offspring, or something that is lacking in interest or vitality. A hospital room that has been prepped for surgery is an example of a room that is sterile.
What are the types of sterility?
Sterility can be divided into three subtypes natural, clinical, and hardship.
What is the main cause of inflammation in the body?
Possible Causes
The most common reasons for chronic inflammation include: Autoimmune disorders, such as lupus, where your body attacks healthy tissue. Exposure to toxins, like pollution or industrial chemicals. Untreated acute inflammation, such as from an infection or injury.
Is the urine sterile?
Despite rumors to the contrary, urine is not sterile . It can contain dozens of different types of bacteria, including Staphylococcus and Streptococcus, which are associated with staph infections and strep throat, respectively.
What are the major types of coat protein?
There are three well-characterized types of coated vesicles, which differ in their coat proteins: clathrin-coated, COPI-coated, and COPII-coated vesicles (Figure 13-4). Each type is used for different transport steps in the cell.
What is the function of the protein coat?
Function. Fundamentally, the viral coat protein functions as protection for the genetic material inside the virus, and as an aid to infecting the host cell with virus DNA. Essentially, the coat protein (CP) is a link between the genetic material and infecting the host.
What are the 3 main groups of bryophytes?
In this part of the website you’ll find descriptions of the features you can see in the three groups of bryophytes – the hornworts, liverworts and mosses. The aim is to give you a good understanding of bryophyte structure and of the similarities and differences between the three groups.
What are 3 examples of bryophytes?
Conclusion. Bryophytes are an informal division that consists of 3 groups of non-vascular plants, namely mosses, liverworts, and hornworts.