Support in plants and the human skeleton
Answers are for parents and teachers.
1
Explain why the outside of a plant needs a waterproof layer, and name the two substances that can supply it.
The cells inside would lose water through the surface. Cutin on the epidermis and suberin in cork make the surface waterproof.
2
Sort into the axial or the appendicular skeleton: scapula, cervical vertebra, femur, rib, clavicle, skull.
Axial: cervical vertebra, rib, skull. Appendicular: scapula, femur, clavicle.
3
Count the bones in the forearm, wrist and palm of one arm.
Radius and ulna 2 + carpals 8 + metacarpals 5 = 15 bones.
4
Name the two organs protected by the rib cage, and say how many pairs of ribs it has.
The heart and the lungs. The rib cage has 12 pairs of ribs.
5
Name the girdle that joins the arms to the axis and the two bones in each of its halves.
The pectoral girdle. Each half is made of a scapula and a clavicle.