Biological Control

• Arthropod Molting and Mouthpart Anatomy:
• Statement (I) is incorrect: Apolysis is the initial detachment of the epidermal cells from the old cuticle; ecdysis is the subsequent physical shedding and casting off of the old exuviae. They are distinct sequential stages of the molt cycle.
• Statement (II) is incorrect: Chelicerae are the pincer-like or fanged feeding appendages characteristic of chelicerate arthropods (spiders, scorpions, ticks, mites). Termite soldiers belong to the order Blattodea (mandibulate insects) and possess heavily sclerotized, adapted biting mandibles, not chelicerae.
• Conclusion: Both Statement (I) and Statement (II) are incorrect (Option 2).

Correct option: (2) Both Statement (I) and Statement (Il) are incorrect

• Ovariole Classification: Insect ovarioles are divided into two main categories: panoistic (lacking nurse cells/trophocytes, as in Orthoptera and Odonata) and meroistic (possessing trophocytes).
• Meroistic Subtypes:
• Acrotrophic (Telotrophic): The nurse cells remain clustered exclusively in the apical germarium at the tip of the ovariole, and elongate cytoplasmic strands (nutritive cords) connect them to developing oocytes in the vitellarium. This condition is characteristic of Hemiptera and polyphagan Coleoptera.
• Polytrophic: Nurse cells accompany each individual oocyte down the vitellarium inside the follicular sheath (typical of Lepidoptera, Diptera, and Hymenoptera).
• Correct Option: Option 3 (Hemiptera).

• Spermatophore Deposition in Lepisma (Thysanura): Male silverfish do not engage in copulation via intromission; instead, in the active presence of a receptive female during ritualized courtship, the male spins silk threads on the ground and deposits a spermatophore droplet, subsequently guiding the female to take it up into her gonopore.
• Spermatophore Deposition in Collembola: Male springtails produce stalked spermatophore droplets and anchor them blindly to the soil or leaf litter substrate independently of whether a female is immediately present; females later encounter and pick them up passively.
• Conclusion: Both statements accurately describe apterygote reproductive behavioral biology.
• Correct Option: Option 1 (Both Statement (I) and Statement (II) are correct).

• Acone Ommatidia Structure: In insect compound eyes, ommatidia are classified according to the nature of the optical focusing element beneath the corneal lens into eucone, pseudocone, acone, and exocone types. In acone ommatidia, a true crystalline cone is absent; instead, four unmodified, transparent Semper cells remain as transparent cytoplasmic structures lacking refractive crystalline secretions.
• Occurrence: Acone ommatidia are characteristically found in hemipteroid orders (Hemiptera), Dermaptera (earwigs), and certain Diptera.
• Other Types: In contrast, eucone ommatidia possess true crystalline cones formed by cone cells (typical of Orthoptera, Lepidoptera, Hymenoptera, Odonata).
• Correct Option: Option 3 ((A) and (B)).