IChoose the correct option in the following questions:1. Skeleton of human body is made up of (a) bones (b) cartilage(c) both bones and cartilage (d) None of these2. Human skeleton comprises (a) skull and backbone (b) ribs and breast bone(c) shoulder and hip bones(d) all of these3. Fixed joints are found in (a) lower jaw (b) skull(c) hands (d) hip bone4. Knee joints are (a) hinge joints (b) ball and socket joints(c) pivotal joints (d) fixed joints5. Fish swims by (a) forming loops alternately on two sides of the body (b) forming loops on single side(c) somersaulting (d) alternate dipping and coming up6. Which one of the following are the characteristics of birds?(a) Strong muscles (b) Light bones(c) Hollow bones (d) All of these7. In cockroaches, the body parts helping in movement are(a) three pairs of legs and two pairs of wings(b) two pairs of legs and two pairs of wings(c) two pairs of legs and three pairs of wings(d) none of these8. Muscular foot is a locomotory organ in (a) snakes (b) earthworm(c) housefly (d) snails9. The organ that protects the main nerve cord is (a) skull (b) backbone(c) breast bone (d) chest bone10. The number of cervical vertebrae in man is (a) ten (b) five(c) seven (d) eight​