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Phylum Cnidaria
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Phylum coelenterata

Juhi Mishra is teaching live on Unacademy Plus

Juhi Mishra
JAI HIND 🇮🇳 M.Sc Botany(gold medalist)CET,DCA,B.Ed. Be Best In BIOLOGY Follow & Subscribe 🎯NEET

U
Unacademy user
learn a lot mam .... thank you so much mam..
N
what is blastostyles, manubrium, ocelli,?
Juhi Mishra
a year ago
Manubrium is a handle shaped part . 1 meaning- It is the broad part of sternum bone in mammals with which clavicle/Shoulder bone articulates with first rib. 2 meaning- It is a tube which bear mouth of a coelenterate. Blastostyle- Imperfect zooid in some hydroids which produces medusoid buds. Ocelli- They are simple photoreceptors which detect light and movement, not make images.most Arthropods have ocelli
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Nandanisingh
a year ago
thanks mam
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Nandanisingh
a year ago
syllabus fr zoology honrs is... details classification, character, general account and type of protozoa, coelenterata, ctenophora, platyhelminthes, aschelminthes, nematodes, helminthes, annelida, arthropoda, mollusca, echinodermata, hemichordata.and detailed study of example of each phylum....
Juhi Mishra
a year ago
I will start with protozoa but please visit my course on animal diversity where you can find notes on phyla
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Nandanisingh
a year ago
yaah Mam.... already l am going through this lesson.... and thank u so much
Juhi Mishra
a year ago
It sounds great...Have a happy learning dear☺
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Nandanisingh
a year ago
thnks mam... and always stay happy.... 😆😆
N
Mam, what is perisarc, hydrotheca and gonothecae
Juhi Mishra
a year ago
Perisarc- Outer chitinous or horny covering of soft parts of hydrozoans Hydrotheca- A cup shape extension of perisarc in hydroids of group leptomedusae that surround and protect hydranth when they are contracted Gonotheca-A capsule develop on hydroids enclosing blastostyle upon which medusoid bud or gonophore develop. Also called teleophore or gonangium.
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Nandanisingh
a year ago
thnks mam..... and pls. can u prepare lecture on multiplication of viruses in detail ?plsssss.... pls...
Juhi Mishra
a year ago
I will make it
N
Nandanisingh
a year ago
Mam... what is dactylozooid and gastrozooid?
N
Nandanisingh
a year ago
Good evening mam...... what is bell margin in hydrozoa
N
Mam, what is velum, stomodaeum?... pls answer me mam
Juhi Mishra
a year ago
Velum is a thin membrane that covers medusa of cnidarians. It is also present in some Molluscs. Stomodaeum is the depression in between brain and pericardium of an embryo and it is the precursor of mouth & anterior pituitary Proctodaeum is the inward fold of Embryonic ectoderm that give rise to anal passage
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Nandanisingh
a year ago
thanks a lot Mam...
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Nandanisingh
a year ago
At b. sc level fr zoology honrs, is your notes available in market?
Juhi Mishra
a year ago
No Nandini, my notes are not in market
nice explanation mam👍👍thnks alot
Juhi Mishra
a year ago
always welcome
Juhi Mishra
9 months ago
Thanks a lot .pls share my lessons to others also and rate 5 star and dedicate hats if u like.
  1. Phylum-Cnidaria By Juhi Mishra


  2. TARGET AUDIENCE All biology aspirants for any competitive exam


  3. This is Juhi Mishra * M.Sc.in Botany(Gold Medalist) 7 years of Teaching Experience CET, DCA & B.Ed in Biology


  4. Phylum Cnidaria/Coelenterata: General Characteristic and Classification


  5. General characteristics of Phylum Coelenterata 1. Kingdom: Animalia 2. Habitat: aquatic, mostly marine 3. Habit: solitary or colonial. Each individual is known as zooid 4. Symmetry: radially symmetrical 5. Grade of organization: tissue grade of organization


  6. 6. Germ layer: diploblastic, outer ectoderm and inner endoderm Mesogloea separates these two layer 7. The body has a single opening called hypostome urrounded by sensor y tentacles. 8. Coelom: gastrovascular cavity or coelenteron.


  7. 9. Nematocyst: organ for capturing and paralyzing pray, present in tentacles 0. Nutrition: holozoic 1. Digestion is both intracellular and extracellular. 2. Respiration and excretion are accomplished by simple diffusion. 3. Circulatory system: absent


  8. 4. Nervous system: poorly develop 5. Many forms exhibit polymorphism ie Polyp and medusa 6. Polyps are sessile, asexual stage 7. Medusa are free swimming, sexual stage 8. Metagenesis: asexual polypoid generation alternate with sexual medusoid generation


  9. Mouth/anus Tentacle Gastrovascular cavity - Gastrodermis Mesoglea Epidermis Body stalk Gastrovascular cavity Gastrodermis Mesoglea Epidermis Tentacle Mouth/anus


  10. 9. Reproduction: - Asexual: by budding - Sexual: by gamatic fusion :0. Fertilization: internal or external 1. Development: indirect with larval stage 2. (Koilos: hollow, enteron: cavity)


  11. mouth tentacle epitheliomuscular gastrovascular cavity gastrodermis mesoglea epidermis mesoglea gastrodermis mesorislongitudinal muscle fibers cnidocyte sensory interstitial nerve net gastrovascular cavity Ecell epidermis Circular muscle fibers Cross section of Hydra


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