(a) What is lac culture? Explain the life cycle of lac insect and describe cultivation and processing of lac in India. Also add a…

(a) Lac Culture

Lac culture is the scientific management and commercial exploitation of the lac insect, Kerria lacca (formerly Laccifer lacca), for the production of resin, dye, and wax.

The life cycle begins when fertilized females lay 200–500 eggs inside the lac cell. The eggs hatch into boat-shaped, red-coloured nymphs called crawlers. These nymphs emerge, walk along twigs, and settle in dense aggregations on tender shoots of host plants. Inserting their piercing-sucking mouthparts into the bark, they feed on phloem sap and secrete a semi-fluid resinous substance from dermal glands across their body. This resin hardens on contact with air, encasing each insect in an individual test or cell.

Following three nymphal instars, sexual dimorphism becomes pronounced. Male nymphs metamorphose into winged or wingless, mouthless adults that emerge from their cells, fertilize the sedentary females, and die soon after. The female nymph never develops wings or distinct body segmentation; after fertilization, she grows rapidly and secretes the bulk of commercial lac. She produces a large resinous chamber, lays eggs, and dies, leaving her body encrusted within the lac matrix.

Cultivation in India relies on specific deciduous host plants, predominantly Palas (Butea monosperma), Ber (Ziziphus mauritiana), and Kusum (Schleichera oleosa). Host trees are systematically pruned to induce succulent shoots. Inoculation is performed by tying mature, brood-lac-bearing twigs onto the fresh branches. After crawler emergence, used brood twigs are removed.

Harvested twigs coated with resin are known as sticklac. Processing begins with scraping the encrustations off the wood, followed by crushing and washing in vats to eliminate insect remains, body pigments, and debris. The dried, washed granular product is seedlac. Seedlac is winnowed to remove fine dust, loaded into long cotton bags, and melted over a charcoal furnace. The molten resin is squeezed through the cloth, mixed, and stretched into thin sheets that break into flakes known as shellac, or molded into button lac.

Economically, lac is a major non-timber forest product providing secondary livelihood and employment to forest-dwelling tribal communities across Jharkhand, Chhattisgarh, Madhya Pradesh, West Bengal, and Odisha. India is a leading global producer and exporter of refined lac. Shellac possesses superior dielectric, adhesive, and film-forming properties, making it indispensable in electrical insulation, varnishes, wood polishing, pharmaceuticals (enteric tablet coating), cosmetics, fruit glazing, and the munitions industry.

(b) Project Tiger

Project Tiger was launched on April 1, 1973, at Corbett National Park as a Centrally Sponsored Scheme to conserve viable populations of the Bengal tiger (Panthera tigris tigris) and its ecological habitats. Functioning on an umbrella species approach, protecting the apex predator ensures the integrity of entire trophic webs and ecosystem services. The management paradigm maintains breeding populations in high-density source habitats that naturally disperse into sink areas and adjoining corridors.

Tigers face severe anthropogenic threats, including habitat loss and fragmentation caused by linear infrastructure projects (highways, railway lines, canals), mining, and human settlements. These factors elevate human-wildlife conflict and retaliatory poisonings. Poaching driven by the illicit international trade in tiger body parts for Traditional Chinese Medicine (TCM) remains an acute pressure. Ecologically, tiger populations are threatened by prey base depletion due to poaching of ungulates, degradation of grasslands by invasive alien plants (such as Lantana camara), and climate change-induced disruptions in fragile ecosystems like the Sundarbans.

India’s conservation strategy is governed statutorily by the National Tiger Conservation Authority (NTCA) under the amended Wildlife (Protection) Act, 1972. Tiger reserves are structured on a core-buffer model, where the inviolate core is kept free of human disturbance through incentivized, voluntary village relocations, while buffer zones accommodate co-managed eco-development. Enforcement is strengthened via the Special Tiger Protection Force (STPF) and real-time electronic patrolling using M-STrIPES (Monitoring System for Tigers: Intensive Protection and Ecological Status). The tiger population has risen to 3,682 (2022 census). Regionally and internationally, transboundary landscape management and anti-poaching operations are coordinated through the Global Tiger Forum.

(c) Imprinting

Imprinting is a specialized, rapid, and developmentally programmed form of learning wherein an animal develops a specific attachment or behavioral response to an object or organism during a brief, genetically constrained "critical period" (or sensitive period) in early ontogeny. Unlike associative conditioning, it occurs without explicit physiological reinforcement and exhibits marked resistance to subsequent modification or forgetting.

Filial imprinting is observed primarily in precocial birds. Konrad Lorenz demonstrated this phenomenon in greylag geese (Anser anser): goslings exposed to Lorenz during a critical window (13–16 hours post-hatching) imprinted on him, following him persistently in preference to their biological mother.

Sexual imprinting operates during early life to direct adult mate choice toward conspecifics possessing traits similar to the rearing parent, as demonstrated in cross-fostered mallard ducks (Anas platyrhynchos).

Habitat (olfactory) imprinting occurs in aquatic species such as sockeye salmon (Oncorhynchus nerka), where juveniles imprint on the unique chemical bouquet of their natal stream, allowing accurate upstream homing years later for spawning.

Neurobiologically, filial imprinting triggers rapid synaptic plasticity and protein synthesis within designated avian telencephalic regions, predominantly the Intermediate Medial Mesopallium (IMHV) and the Lateral Paraolfactory Lobe (LPO).

Evolutionarily, imprinting is an adaptive mechanism ensuring immediate maternal protection, social cohesion, and the prevention of interspecific hybridization. In applied conservation and captive breeding programmes, understanding imprinting is vital; rearing endangered chicks (such as the California Condor or Whooping Crane) requires lifelike hand puppets and isolation from human caretakers to prevent maladaptive human-directed imprinting prior to wild reintroduction.