Q: 131 (SSC/NA)
question_subject:
Science
question_exam:
SSC
stats:
0,4,13,4,2,4,7
keywords:
{'chitinous exoskeleton': [1, 0, 0, 0], 'snails': [1, 0, 0, 0], 'insects': [1, 0, 1, 2], 'animals': [0, 0, 1, 2], 'sponges': [1, 0, 1, 1], 'urchin': [1, 0, 0, 0], 'sea': [1, 0, 0, 0]}
Animals with chitinous exoskeletons are insects. Chitin is a tough, flexible, and lightweight material that makes up the outer covering or exoskeleton of insects. The exoskeleton functions as a protective barrier, providing support and protection for the insect`s internal organs.
Option 2, sponges, do not have an exoskeleton made of chitin. Instead, they have a porous body structure made of cells and protein fibers called spongin.
Option 3, sea urchins, have a hard outer skeleton or test made of calcium carbonate, not chitin.
Option 4, snails, have a shell made of calcium carbonate, not chitin.
Therefore, the only correct option is option 1, insects, as they are the animals with a chitinous exoskeleton.