Question

give brief explanation of pisces?

Answer 1

$\textbf{Hey..mate here is yur ans...}$
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⏩ $\pink{Pisces}$ ⏪
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⏩They mostly found in $\pink{Marine water}$ but some are found in $\red{freshwater}$.

⏩They are orginated from $\blue{cyclostomata}$ during $\green{silurian period}$ and become dominant and diversified during $\purple{devonian period}$.
So devonian period is known as $\pink{Golden era of pisces}$.

⏩ They are called $\textbf{true fishes.}$

⏩ In Pisces Both $\textbf{paired and unpaired fins}$ are present for swimming.

⏩They have $\red{two chambered heart}$ ➡

●$\pink{1 auricle}$.

●$\pink{1 vantricle}$.

⏩ They are $\bold{poikilothermic}$ ( cold blooded ).

⏩ Their body is $\blue{stream lined}$. ( Narrow from both the ends and broad in between ).

⏩ Notochord is persistent thorugh out the life.

⏩ Skull and endoskeleton is made up of [tex\textbf{bones or cartilage.}[/tex]

⏩ Skull is $\green{monochondylic}$ ( They have only one occipaetal chondyle ).

⏩ Between skull and endoskeleton their are $\textbf{1 protective meninx}$ are present.

● $\red{Meninx prinitiua}$.

⏩ Scales on the body are smaller or larger ( Mesodermal scales ).

⏩ $\textbf{Two Nostrils}$ are present.

⏩ $\textbf{Eyelids are present}$.

⏩ Nictiating Membrane is present. It is a transparent protectivelayer ( 3 eyelids ).

⏩ External and middle ear are absent only inner ear is present.

⏩ Brain do not have carpus collossum and cerebral cortex.

⏩ Heart is venous they contain only deoxygeneted blood.

⏩ Sinus venosus and trunkers arteriosus are two additional chamber associated with heart but these are not chamber of heart beacuse they do not made up of cardiac muscles.

⏩ They have all three portal system are present➡

● $\blue{Renal portal system}$

● $\textbf{Hepatic portal system.}$

● $\purple{H-H portal system}$

⏩ $\red{Lateral line receptor}$ are present.

⏩ They are $\green{amphcoelous}$ type vertebrae.

⏩ $\textbf{Lateral line receptors}$ are present.

⏩ Pisces are $\blue{unisexual}$. fertilization may be $\textbf{external or internal.}$

⏩ They have $\pink{direct development}$.

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Answer 2

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✴Pisces is a group of organism which live under water. They are referred to as fishes.

✴They do respiration through their gills because they respire that oxygen which is dissolved in water.

✴They have got fins and tail to can swim in water.

✴The mode of reproduction in those organism is External Fertilization which means that they are oviparous organisms.