Algae have diverse cell structures and life cycles. Prokaryotic algal cells have no nucleus but have a plasma membrane and cytoplasm divided into a peripheral, pigmented region and central non-pigmented region. Eukaryotic algal cells contain membrane-bound organelles and a single nucleus. Reproduction occurs through fragmentation, fission, budding or the formation of spores like zoospores, akinetes or tetraspores. Life cycles include haplontic with a dominant haploid generation, diplontic with a diploid dominant generation, and diplohaplontic with alternating haploid and diploid generations that may be isomorphic or heteromorphic.
Chlamydomonas is unicellular, motile green algae. In this presentation the systematic position, occurrence, structure and different types of reproduction is being explained. palmella stage in vegetative reproduction is one of the outstanding character found among the other algae.
Chlamydomonas is unicellular, motile green algae. In this presentation the systematic position, occurrence, structure and different types of reproduction is being explained. palmella stage in vegetative reproduction is one of the outstanding character found among the other algae.
Oedogonium LifeCycle /vegetative cell/Asexual and sexual reproduction.Katta Vani
Oedogonium belongs to chlorophyta. Fresh water alga .We can easily identify with the help of cap cells. The plant body is haploid and the life cycle is also haplontic type.
Describe in detail about fungi and general characters of fungi and different modifications and reproduction in fungi especially for undergraduate students
The spicules or sclerites are definite bodies, having a crystalline appearance and consisting in general of simple spines or of spines radiating from a point.
They have an axis of organic material around which is deposited the inorganic substance, either calcium carbonate or hydrated silica.
The genus Coleochaete is represented by about 10 species, out of which 3 species are found in India. They grow in fresh water either as epiphytes on different angiosperms. They show much variation in their heterotrichous nature. Due to well-developed prostrate system, it forms discoid thailus and looks like
pseudo- parenchyma of one cell in thickness.
This ppt describes about the genus Riccia, its distribution, habiata, gametophytis as well as sporophytic phase, etc. Hope it will help the students of Botany in preparing for their examk nations.
Oedogonium LifeCycle /vegetative cell/Asexual and sexual reproduction.Katta Vani
Oedogonium belongs to chlorophyta. Fresh water alga .We can easily identify with the help of cap cells. The plant body is haploid and the life cycle is also haplontic type.
Describe in detail about fungi and general characters of fungi and different modifications and reproduction in fungi especially for undergraduate students
The spicules or sclerites are definite bodies, having a crystalline appearance and consisting in general of simple spines or of spines radiating from a point.
They have an axis of organic material around which is deposited the inorganic substance, either calcium carbonate or hydrated silica.
The genus Coleochaete is represented by about 10 species, out of which 3 species are found in India. They grow in fresh water either as epiphytes on different angiosperms. They show much variation in their heterotrichous nature. Due to well-developed prostrate system, it forms discoid thailus and looks like
pseudo- parenchyma of one cell in thickness.
This ppt describes about the genus Riccia, its distribution, habiata, gametophytis as well as sporophytic phase, etc. Hope it will help the students of Botany in preparing for their examk nations.
This maybe of help for UG+PG Botany students studying mycology. It's about the general account of class Chytridiomycetes. Good for quick revision and information.
*Critics are very welcomed*
Ascomycota is a phylum of the kingdom Fungi that, together with the Basidiomycota, forms the subkingdom Dikarya. Its members are commonly known as the sac fungi or ascomycetes. It is the largest phylum of Fungi, with over 64,000 species.The defining feature of this fungal group is the "ascus" (from Ancient Greek ἀσκός (askós) 'sac, wineskin'), a microscopic sexual structure in which nonmotile spores, called ascospores, are formed. However, some species of the Ascomycota are asexual, meaning that they do not have a sexual cycle and thus do not form asci or ascospores. Familiar examples of sac fungi include morels, truffles, brewers' and bakers' yeast, dead man's fingers, and cup fungi. The fungal symbionts in the majority of lichens (loosely termed "ascolichens") such as Cladonia belong to the Ascomycota.
Ascomycota is a monophyletic group (it contains all descendants of one common ancestor). Previously placed in the Deuteromycota along with asexual species from other fungal taxa, asexual (or anamorphic) ascomycetes are now identified and classified based on morphological or physiological similarities to ascus-bearing taxa, and by phylogenetic analyses of DNA sequences.
Microbiology - Algae
Algae is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades.
Algae are sometimes considered plants and sometimes considered "protists" (a grab-bag category of generally distantly related organisms that are grouped on the basis of not being animals, plants, fungi, bacteria, or archaeans).
About 20,000 species.
Eukaryotic cell and contain all the membrane bound organelles.
Thallus is green due to the presence of green pigment chlorophyll.
Chlorophyll is contained in chloroplast.
Pyrenoids embedded in chloroplast.
Cytoplasm contains vacuoles.
Motile cell of primitive forms contains eye spot or stigma.
Reserve carbohydrates are in the form of starch.
Cell wall invariably contains cellulose.
Produce motile reproductive bodies generally with two or four flagella.
Most are aquatic but some are subarial.
Several species of ulvales and siphonales are marine.
Some strains of chlorella are thermophilic.
Species of chlamydomonas and some chlorococcales occur in snow.
Coloechaete nitellarum is endophytic.
Cephaleuros is parasitic – cause ‘red rust of tea’.
Live epizoically on or endozoically within the bodies of lower animals – chlorella is found in hydra; chlorella beneath the scales of fish; characium on the antennae of mosquito.
Green algae in assosciation with the fungi constitute lichens.
The impact of tourism on climate change.pptxRenuJangid3
Tourism is one of the world’s fastest growing industries as well as the major source of income for many countries, and affects the economy of both the source and host countries. It also source foreign exchange earning and employment for many developing countries
Pesticides impact on environment & biopesticides.pptxRenuJangid3
A pesticides is a toxic chemical substance that are meant to control pests. They detain and eliminate certain pest populations including insects, rodents, fungi, weeds, and other animals.
Keratinophilic fungi are an ecologically important group of fungi and play significant role in decomposing keratin containing wastes such as hair, fur, nail and feather.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
What is greenhouse gasses and how many gasses are there to affect the Earth.moosaasad1975
What are greenhouse gasses how they affect the earth and its environment what is the future of the environment and earth how the weather and the climate effects.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
2. ALGAE
• The term algae was first introduced by Linnaeus in 1753 but he had used this term for the plants we know as
bryophytes now a days. It was A. L. de Jusssieu (1789) who delimited the term for the algae only known to
us at present.
• Algae are chlorophyll bearing thalloid plants with no differentiation into tissue or tissue system; however
some algae have advanced complex thalli with slight differentiation of true tissues (Ulva, Sargassum, etc.).
• In India, literature provided the evidence of phycology since 18th century where major interests were on
macroscopic forms of algae. F. E. Fritsch (1907) published a marvelous work on subaerial and fresh water
algae from Ceylon. He published the classification of algae in his book ‘Structure and Reproduction of the
algae’.
3. CELL ULTRASTRUCTURE
• Algal cells are:- Prokaryotic, Eukaryotic and Mesokaryotic.
• Ultrastructure of Prokaryotic :- The prokaryotic algal cell can be divided into two parts- Outer
cellular covering and cytoplasm.
• (A) Outer cellular covering: a) Slime layer or mucilaginous sheath- Is is a characteristic feature
of all cyanobacteria (blue-green algae). In the sheath, fibrils of peptic acid and
mucopolysachharides are arranged reticulately so that the sheath appears to be homogenous. Its
main function is to retain absorbed water to protect the cell from desiccation.
• B)Cell wall- The cell wall is rigid and made up of mucopeptide. It consists of four layers which are
named as L1, L2, L3 and L4.
• c) Plasma membrane- It is made up of lipid bilayer.
4. (B) Cytoplasm:- It is differentiated into chromoplasm and centroplasm.
a) Chromoplasm- It is the outer and peripheral pigmented region. It consists of parallel
photosynthetic lamellae or thylakoids. These lamellae contain chlorophyll a, carotenoids and
phycobilins. The membrane bound organelles are not found in chromoplasm. However, 70s
ribosomes, αgranules, β-granules, structural granules, polyhedral bodies, gas vacuoles etc are
found in chromoplasm. Gas vacuoles are made up of vesicles. These vacuoles provide buoyancy
to the cell.
Centroplasm- It is the central colourless region which consists of chromatin material or DNA
material that is not bounded with histone proteins. Hence no organized nucleus is found.
5. Ultrastructure of Eukaryotic algal cell
• a) Cell wall- It made up of cellulose. In some brown algae, alginic acid is present in their cell wall.
Certain algae, particularly the diatoms possess silicified cell wall. Xylan, agar and carrageenin are
present in cell wall of red algae.
• b) Plasma membrane- It is made up of protein lipid bilayer.
• c) Cytoplasm- Inside the plasma membrane dense cytoplasm is present. In cytoplasm, membrane
bound cell organelles are present. Ribosomes are of 80s type. Cells of most algae contain one
chloroplast per cell with the exception of few species whose cells have more than one chloroplast.
single nucleus is present in most of the algae, but multinucleate eukaryotic algal cell are also found
in considerable number. DNA is bounded with the histone proteins.
• e) Flagella- In motile algal cell, thallus bears flagella which originates from the basal granules or
blepharoplast. It shows a typical 9+2 arrangement.
6.
7. 3. Mesokaryotic cell
The mesokaryotic cell is the intermediate cell of the Prokaryotic cell and the Eukaryotic cell. Dodge has first
used the term mesokaryotic in 1966 for the cell that contains an intermediate nucleus (both eukaryotic and
prokaryotic characters are present). Mesokaryotic cell contains a membrane-bound organized nucleus. The cells
are medium-sized and have membrane-bound cell organelles like – mitochondria, plastids, endoplasmic
reticulum, etc. The organisms having mesokaryotic cells are called mesokaryotes.
8. Plastids and Photosynthetic Pigments
• The most prominent feature of an algal cell is the plastid, which makes an important characteristic of an algal
cell for classification. Plastids which consist of chlorophyll a and chlorophyll b are called
CHLOROPLASTS and the one which lacks chlorophyll b are called CHROMATOPHORES.
• (i) Cup shaped: Chlamydomonas , Volvox
• (ii) Discoid: Chara , Vaucheria , Dinophyceae, Bryopsidophyceae and many diatoms
• (iii) Girdle or C shaped: Ulothrix
• (iv) Ribbed: Volvocales
• (v) Reticulate: Oedogonium , Hydrodictyon and Cladophora
• (vi) Spiral or ribbon shaped: Spirogyra
• (vii) Stellate: Zygnema
9.
10. REPRODUCTION
• Reproduction in algae takes place by vegetative, asexual and sexual methods.
• A. Vegetative Reproduction
• a) Fragmentation- In this process, filament breaks into fragments and each fragment give rise to a new
filamentous thallus. The common examples are Ulothrix, Spirogyra, Oedogonium, Zygnema, Oscillatoria,
Nostoc etc.
• b) Fission- This process is common in desmids, diatoms, and other unicellular algae. The cell divides into two
by mitotic division and then separation occurs through septum formation.
• c) Adventitious branches- Protonema develops in certain algae like Chara and give rise to new thalli when
detached from parent thallus. These adventitious branches develop mainly on the rhizoids. Other examples
include Dictyota and Fucus.
• d) Tubers- Tubers are spherical or globular bodies which are found on lower nodes or rhizoids of Chara.
These tubers when detach from parent plant can give rise to new thalli.
11. f) Budding- In some algae like Protosiphon, budding takes place which results in new individuals.
e) Amylum stars- In Chara, star shaped bodies filled with amylum starch are formed that give rise to new
individual after detaching from the parent plant.
g) Hormogonia- In some cyanobacteria like Nostoc, Cylindrospermum hormogonia develop that may give rise
to new thalli. These hormogonia are of varying lenths and may develop at the place of heterocysts in the thallus.
These hormogones are produced by breakage of filament into two or more cells.
h) Hormospores or hormocysts- Hormospores are thick walled hormogones which are produced in drier
conditions.
Budding
Fission
Fragmentation
12. B. Asexual Reproduction
• a. Zoospores- These are flagellated asexual spores which are formed in zoosporangium or directly from the
vegetative cells. The zoospores may be bi, quadric or multiflagellate. e.g., Chlamydomonas (biflagellate),
Ulothrix, Cladophora (quadriflagellate), Vaucheria, Oedogonium (multiflagellate).
• b. Hypnospores- Hypnospores are thick walled, non flagellated spores with plenty of food reserves. They are
produced under unfavourable conditions by some green algae. They germinate into new plants with return of
favourable environmental conditions. e.g., Chlamydomonas, Protosiphon.
• c. Akinetes- In filamentous forms, certain vegetative cells become thick walled elongated structures called as
akinetes. It can survive under unfavourable conditions and can give rise to new individual on occurrence of
favourable conditions. e.g., Anabaena
Multiflagellate zoospore
13. d. Aplanospores- These are non flagellated thin walled asexual spores that are formed in majority of aquatic
algae by the failure of flagella formation due to some unfavourable conditions.
e. Tetraspores- Tetraspores are non motile asexual spores that are formed in some members of Rhodophyceae
and Phaeophyceae.
f. Monospores- Single spore formed in the sporangia is called monospore. Eg. Rhodophyceae.
g. Autospores- These are actually aplanospores which appear identical to the parent cell. Hence referred as
autospores.
h. Heterocysts- According to some phycologists, heterocysts are sometimes able to reproduce asexually. These
structures are found in blue green algae and depending upon the position in thallus they may be terminal or
interstitial.
i. Auxospores- auxospores are produced in the member of Bacillariophyceae.
j. Carpospores- Carpospores are produced in carposporophyte of red algae.
k. Paraspores- In some members of Rhodophyceae, paraspores are formed that give rise to new individual.
14. l. Statospores- Statospores are produced in the members of Bacillariophyceae and Xanthophyceae. Statospores
formed by diatoms are thick walled.
m. Neutral spores- In some alga, the protoplast of vegetative cells directly functions as spores and these are
called neutral spores. e.g., Asterocystis, Ectocarpus.
n. Nannocytes- In the members of chroococcales, the cell content divide repeatedly to produce numerous very
small spores. The name nannocytes to these very small spores was given by Geitler. E.g., Macrocystis,
Gloeocapsa.
o. Gongrosira stage of Vaucheria- In Vaucheria, the protoplast divides into several cysts like structures or
hypnospores. This stage looks like an algal form ‘Gongrosira’. Each hypnospore or cyst may give rise to new
thallus.
15. C. Sexual Reproduction-
• a) Isogamous- When fusing gametes are morphologically similar and physiologically different (+ and -) then
the sexual reproduction is called as isogamous. E.g., Chlamydomonas, Ulothrix, Zygnema, Spirogyra.
• b) Anisogamous- In anisogamous sexual reproduction fusing gametes are morphologically as well as
physiologically different. The gametes are produced in different gametangia. The microgametes are male
gametes while macrogametes are female gametes. e.g., Chlamydomonas.
• c) Oogamous- Oogamy is the most advanced type of sexual reproduction in which microgamete or male
gamete fuses with a large female gamete or eg. Male gametes are produced in antheridium while female
gamete or egg is produced within a structure called as oogonium. During fertilization male gamete reaches the
oogonium to fertilize the egg and a diploid zygote is formed. e.g., Chlamydomonas.
16. LIFE CYCLES IN ALGAE
• 1. Haplontic Life Cycle- In this type of life cycle the main plant body is gametophytic (haploid). Eg. Green
algae.
17. • 2. Diplontic Life Cycle- The dominant plant thallus is diploid. The thallus reproduces sexually by gametes
that are formed by meiosis in sex organs. Eg. Diatoms
18. 3. Diplohaplontic Life Cycle- In this type of life cycle two different generations alternate each other.
a. Isomorphic- In this life cycle, alternating
sporophyte and gametophyte are
morphologically similar. E.g. Ectocarpus, Ulva,
Cladophora, Dictyota etc.
b. Heteromorphic- In this life cycle, alternating
generations are morphologically dissimilar. E.g.,
Laminaria, Desmarestia etc.
19. 4. Haplobiontic Life Cycle- This is either diphasic or triphasic life cycle. In Nemalion a red
alga exhibits two haploid phases (gametophyte, carposporophyte) and a diploid zygote.
Batrachospermum (red alga) do exhibit haplobiontic life cycle but it is triphasic as it consists of
three prominent haploid phases (main gametophyte, carposporophyte and chatransia phase).
5. Diplobiontic Life Cycle- This life cycle consists three phases of which two phases are diploid
and one is haploid. Tetraspores eventually develop into main gametophytic plant thallus. This
type of life cycle is exhibited by some members of red algae such as Polysiphonia.