Question

Explain the mode of feeding of starfish​

Answer 1

Answer is:-

A starfish feeds by first extending its stomach out of its mouth and over the digestible parts of its prey, such as mussels and clams. The prey tissue is partially digested externally before the soup-like "chowder" produced is drawn back into its 10 digestive glands.

$<font colour="blue"><b><u><marquee behaviour="scroll"direction="right"=marquee scrollamount=150>⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡■■◉◉★▼●ᴥ●▼★◉◉■■⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡</marquee>$

$<font colour="orange"><b><u><marquee behaviour="scroll"direction="left"=marquee scrollamount=130>⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡■■◉◉★▼●ᴥ●▼★◉◉■■⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡</marquee>$

$<b><u><marquee behaviour = ''alternative"=marquee scrollamount=10>Hope it helps you dear.......xD</marquee>$

$<font colour="blue"><b><u><marquee behaviour="scroll"direction="right"=marquee scrollamount=130>⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡■■◉◉★▼●ᴥ●▼★◉◉■■⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡</marquee>$

$<font colour="orange"><b><u><marquee behaviour="scroll"direction="left"=marquee scrollamount=150>⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡■■◉◉★▼●ᴥ●▼★◉◉■■⊡⊡⊡⊡⊡⊡⊡⊡⊡⊡</marquee>$

Answer 2

$\huge\underline \mathfrak\orange{Answer}$

The mouth of a starfish is located on the underside of the body, and opens through a short esophagus into firstly a cardiac stomach, and then, a second, pyloric stomach. Each arm also contains two pyloric caeca, long hollow tubes branching outwards from the pyloric stomach. Each pyloric caecum is lined by a series of digestive glands, which secrete digestive enzymes and absorb nutrients from the food. A short intestine runs from the upper surface of the pyloric stomach to open at an anus near the center of the upper body.

Many starfish, such as Astropecten and Luidia, swallow their prey whole, and start to digest it in the stomachs before passing it into the pyloric caeca. However, in a great many species, the cardiac stomach can be everted from the organism's body to engulf and digest food. In these species, the cardiac stomach fetches the prey, and then passes it to the pyloric stomach, which always remains internal.

Some species are able to use their water vascular systems to force open the shells of bivalve molluscs, such as clams and mussels. A continuous pull on the two valves by the tube feet is sufficient to part them slightly. A cleft of 0.1 mm (0.004 in) is sufficient for insertion of a fold of the cardiac stomach. Enzymes produced by this start digesting the mollusc's body and under this onslaught, the adductor muscles relax and the valves gape. Later the stomach is retracted with its semi-digested contents and the food is moved to the pyloric stomach. Further digestion occurs in the intestine. Waste is excreted through the anus on the aboral side of the body.

Because of this ability to digest food outside its body, the starfish is able to hunt prey much larger than its mouth would otherwise allow, such as clams and oysters, arthropods, small fish, and molluscs. However, some species are not pure carnivores, and may supplement their diets with algae or organic detritus. Some of these species are grazers, but others trap food particles from the water in sticky mucus strands that can be swept towards the mouth along ciliated grooves.

Some echinoderms can live for several weeks without food under artificial conditions. Scientists believe they may receive some nutrients from organic material dissolved in seawater

$<font color="red">$$<b >$$<marquee>$ Hope it helps

follow me