Animal Locomotion and Movement Purposes — NEET Biology

Correct answer: A — S1, S2 and S3

Let's evaluate each statement: S1: Locomotory movements are specifically defined as voluntary movements that result in a change of an organism's place or location. This statement is correct. The NCERT states, 'Such voluntary movements are called locomotion.' These movements explicitly involve a change in location. S2: Animals commonly perform locomotion to find food, shelter, a mate, or to escape from predators. This statement is correct. The NCERT lists these as general purposes for locomotion: 'search of food, shelter, mate, suitable breeding grounds, favourable climatic conditions or to escape from enemies/predators.' S3: In unicellular organisms like Paramoecium, cilia contribute to both food movement through the cytopharynx and general locomotion. This statement is correct. The NCERT mentions, 'in Paramoecium, cilia helps in the movement of food through cytopharynx and in locomotion as well.' S4: All movements observed in living beings are considered locomotion, although not all locomotions are movements. This statement is incorrect. The NCERT explicitly states the opposite: 'all locomotions are movements but all movements are not locomotions.' S5: Amoeboid movement, such as that exhibited by macrophages and leucocytes, typically does not facilitate a change in the cell's overall location. This statement is incorrect. Macrophages and leucocytes move within the body by amoeboid movement, which does facilitate a change in their location to reach sites of infection or injury. Therefore, statements S1, S2, and S3 are correct.