GENERAL HISTOLOGY

OESOPHAGUS STOMACH

ECHINODERMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
By what process will starfish regrow an arm torn off by a predator?
A
Reconstructive meiosis
B
Regeneration
C
Tissue regenesis
D
Mitotic restoration
Explanation: 

Detailed explanation-1: -Though starfish are well understood to utilize their regenerative capabilities to regrow arms eaten or damaged by predators, they are also capable of regenerating arms they have intentionally shed through a process known as autotomy.

Detailed explanation-2: -Asexual reproduction occurs by fragmentation when the animal breaks into two parts and each half forms a complete new sea star or by regeneration of parts of the animal. Life span is 3-5 years.

Detailed explanation-3: -For starters, they are among the few species on the planet that can regenerate their arms. They can do this because of two reasons: Because they house their vital organs in their central disc, and because they have what scientists call ‘indeterminate stem cells’.

Detailed explanation-4: -Starfish. These five-limbed creatures can regrow arms that detach from their central disc, and some species have even been observed to complete the process in reverse: regrowing an entire body from a lost arm. To do this the starfish will store nutrients in the arm until it is able to regrow its mouth.

Detailed explanation-5: -Asexual reproduction in starfish takes place by fission or through autotomy of arms. In fission, the central disc breaks into two pieces and each portion then regenerates the missing parts.

There is 1 question to complete.