Systematics

• Masked Hunter Bug: Species of the genus Reduvius (family Reduviidae, assassin bugs), such as Reduvius delicatus and Reduvius personatus.
• Camouflage Behaviour: The nymphs possess glandular setae on their body surface that secrete a sticky substance, causing dust, flour particles, lint, and grain debris to adhere to their cuticle. This serves as an effective disguise ("mask") while hunting stored-product insect pests and booklice.
• Correct Option: Option 2 (Reduvius delicatus).

• Water pH Classifications in Pesticide Spray Application:
• Pair-by-Pair Matching:
• Water pH 2.0 $\rightarrow$ (III) Highly acidic: Solutions with pH $\lt 3.0$ have high hydrogen ion concentrations and are categorized as highly acidic.
• Water pH 6.0 $\rightarrow$ (IV) Moderately acidic: pH in the range of $5.5-6.5$ is slightly/moderately acidic (ideal for spray water to avoid alkaline hydrolysis of pesticides).
• Water pH 7.0 $\rightarrow$ (II) Neutral: Exactly at the neutral point where $[ ext{H}^+] = [ ext{OH}^-] = 10^{-7}\text{ M}$.
• Water pH 9.0 $\rightarrow$ (I) Alkaline: pH $\gt 7.0$ indicates excess hydroxide ions, causing rapid alkaline hydrolysis and degradation of organophosphates and carbamates.
• Correct Choice: Option 3 maps (A)-(III), (B)-(IV), (C)-(II), (D)-(I).

Correct option: (3) (A) - (IID, (B) - (IV), (E) - ), (B) - (1)

• Pebrine Disease in Sericulture:
• Causal Organism: Pebrine is caused by the obligate microsporidian fungal parasite Nosema bombycis.
• Destructiveness: It is the most feared and devastating disease in sericulture because it undergoes transovarial (congenital) transmission from infected female moths into the eggs, as well as oral transmission. An entire batch of larvae can collapse, exhibiting characteristic black pepper-like spots on the integument.
• Pasteur's Discovery: Louis Pasteur developed mother moth examination (cellular grainage system) to eliminate infected batches.
• Conclusion: Pebrine is the most destructive disease in sericulture (Option 2).

Correct option: (2) Pebrine