Phylum Rotifera

Question 1

Phylum rotifera?

Answer 1

Philodina (fresh water animals) 🫓

Question 2

Where do phylum rotifers live?

Answer 2

Some sessile,
Some colonial
Some Epizoic (mean they live on the surface of other animal)

Question 3

Structures of phylum rotifers?

Answer 3

Corona
And their body has:- head, truck, tail or foot.
And they move like leech and they move by corona or both.

Question 4

Internal structures of rotifers?

Answer 4

Cuticle is external
Syncytial epidermis
Sub-epidermal muscles 💪
Location of pseudocoel.
Mastax (Is stomach area)or pharynx have muscles.
Salivary and gastric glands.
Protonephridia tubules (responsible of osmoregulation)
Female have cloaca.
Beloved brain, dorsal to mastax

Question 5

Reproduction of Rotifers?

Answer 5

They are dioecious.
One testis
Male lack cloaca.
Copulation, male penis can penetrate any part of the female and inject sperm.

Question 6

Eutely of Rotifers?

Answer 6

Neuclear consistency:-
183 nucleus in brain 🧠
39 nucleus in stomach.
172 nucleus in corona (mouth is between corona).

Question 7

Haplodiploidy of Rotifers?

Answer 7

Amictic = Mitosis
Mictic = Meioses
parthenogenesis = means no sperm is involved

2 Chromosomes ➡️ by process of mitosis release egg 🥚 become Amictic female ➡️ This female make eggs ➡️ egg becomes female (This cycle is called diploid parthenogenesis)⬆️
When environment becomes Tough
Mix is stimulus:- egg that female makes becomes Mictic female ➡️ Mictic female make sperm and egg ➡️ and both of those are haploid ➡️ then haploid egg is fertilized by sperm ➡️ and it becomes male ➡️ male release sperm➡️ sperm fertilize the egg that come form Mictic female ➡️ and this egg is dormant or enchantment (mean it can stay in environment for long time, it does not multiply) ➡️ when environment comes back to normal then that egg becomes FEMALE. This is called Bisexual Reproduction ⬆️.