Sessile is the term given to the organisms, which spend their entire adult lives attached to one spot. Tube feet is the structure that works as a suction cup in the echinoderm.
• The biological property of an species, which illustrates that it lacks a means of locomotion by self is known as sessility.
• The sessile organisms are naturally immobile. These organisms spend entirely their lives in one spot unless they are moved with the help of external force like water current.
• The large number of small flexible hollow appendages projecting through the ambulacra in an echinoderm, which is used for collecting food or for locomotion are known as tube feet.
• Each of the tube feet functions like a sticky suction cup, which helps to hold the surface underneath the echinoderm, this helps them in movement.
Thus, the correct answers are options a for 1st question and option b for 2nd question.
To know more about:
https://brainly.com/question/3006290
