Q.Identify the correctly matched pair

Step 1. Check option (a) - 'Actinomycete – Late blight'. Wrong pairing. Late blight of potato is caused by Phytophthora infestans, which is a Fungus (an Oomycete), not an Actinomycete. The disease actually associated with an Actinomycete (Actinomyces bovis) is lumpy jaw.

Step 2. Check option (b) - 'Mycoplasma – lumpy jaw'. Wrong pairing. Lumpy jaw is caused by Actinomyces bovis, an Actinomycete, not a Mycoplasma. Mycoplasma is instead associated with diseases such as sandal spike, little leaf of brinjal, witches' broom of legumes and phyllody of cloves.

Step 3. Check option (d) - 'Fungi – sandal spike'. Wrong pairing. Sandal spike is caused by Mycoplasma, not by a fungus. The disease genuinely caused by a fungus in this set is late blight (Phytophthora infestans). …

Trace each disease back to its correct causative organism/group from the chapter and che …

• Assuming each option is an independent fact rather than noticing the four diseases and four groups are simply rotated/mismatched against each other. …