Mark the odd one in each series: (e) Protonema; mesothorax; metathorax; coxa
Explanation ‘Protonema’ is correct ‘Protonema’ is found in mosses. It is produced when the spore of the moss germinates. It is a chain of cells (thread-like) that forms during the haploid phase. Hence, it is the odd one out. Explanation ‘Mesothorax’ is incorrect The thorax region of the body of an insect comprises three segments. ‘Mesothorax’ is the middle segment of the thorax region. It is the part that bears the second pair of legs. Hence, it is not the odd one out. Explanation ‘Metathorax’ is incorrect ‘Metathorax’ is one of the segments of the thorax region of the insects. It is the segment that contains the hindwings along with the third pair of legs. Hence, it is not the odd one out. Explanation ‘Coxa’ is incorrect ‘Coxa’ is the segment of the leg of the insect that attaches the leg to the thorax region. Hence, it is not the odd one out. Final answer Protonema
