Mark the odd one in each series: (d) Maxilla; mandible; labrum; antennae
Explanation ‘Antennae’ is correct ‘Antennae’ of a cockroach is used for various sensory responses such as tactile, humidity, and olfactory. It is the part that is situated in the head region. Hence, it is the odd one out. Explanation ‘Maxilla’ is incorrect ‘Maxilla’ is one of the parts of the mouth of the cockroach. It is present in pairs and is used for manipulating food and tasting it. Hence, it is not the odd one out. Explanation ‘Mandible’ is incorrect ‘Mandible’ is the anterior-most part of the mouth of the cockroach. It is used for grasping the food item and then crushing or cutting it. It is also used in defense. Hence, it is not the odd one out. Explanation ‘Labrum’ is incorrect ‘Labrum’ is a fused structure that is located just below the mouthparts of the cockroach. It helps in holding the food material while the cockroach is feeding. Hence, it is not the odd one out. Final answer Antennae
