Question

Find the odd one out in each of the following groups giving reasons.
(a) blood, bone, kidney, cartilage
(b) liver, heart, stomach, intestine
(c) skull, fingers, ureter, backbone
(d) spine, knee, shoulder, fingers

Answer 1

(a) kidney
Blood, bone and cartilage are connective tissues, whereas kidney is not.
(b) heart
Liver, stomach and intestine are parts of digestive system, whereas heart is a part of circulatory system.
(c) ureter
Skull, fingers and backbone are parts of skeletal system, whereas ureter is a part of excretory system.
(d) spine
Knee, shoulder and fingers are parts of skeletal system, whereas spine is a part of nervous system.