Explanation: The primary sector extracts or harvests products directly from nature — crops, fish, minerals, timber. It forms the base of an economy and supplies raw materials to other sectors.

Explanation: Secondary sector (manufacturing) processes raw materials from agriculture, mining, and forestry. Without stable raw inputs from the primary sector, manufacturing costs rise and production can be disrupted.

Explanation: Agriculture in developing countries often uses traditional methods, leading to low output per worker. During off-seasons workers may be idle or take low-paying casual work, causing disguised unemployment and underemployment.

Explanation: Mining extracts natural resources → primary. Weaving converts raw materials into goods → secondary. Public transport provides a service → tertiary.

Explanation: Industrialisation and expansion of services increase GDP contributions from other sectors; even if agricultural output rises in absolute terms, its percentage share falls.

Explanation: Coal is vital for energy and industry; fertile land supports agriculture which employs a large share of the population.

Explanation: Secondary activities add value by transforming inputs — manufacturing, construction are typical secondary activities.

Explanation: Factories, construction and processed goods employ many workers in cities and towns. Manufactured exports (textiles, machinery) generate export earnings and stimulate ancillary industries.

Explanation: The processing raises the product's market value. Value added equals the difference between the value of output and the cost of intermediate goods.

Explanation: Large-scale uses heavy capital and many workers; small-scale may be labour-intensive, often local and family-run.

Explanation: Industry raises per-worker productivity, urban employment opportunities, and produces goods for domestic consumption and foreign markets, stimulating overall growth.

Explanation: Manufacturing creates products by processing inputs; construction assembles materials on-site to create buildings/ infrastructure.

Explanation: Tertiary activities support production and consumption through services — finance, healthcare, education, transport, trade, etc.

Explanation: Service industries are labour-intensive in many sub-sectors (retail, hospitality); growth often raises demand for trained professionals (IT, finance), driving education and skill training.

Explanation: Marketing and extension help farmers sell and improve yields; transport moves raw materials and finished goods so manufacturers can operate efficiently.

Explanation: As standards of living rise, demand shifts to services (health, education, leisure). Technological advances (IT, finance) create high-value service exports increasing GDP share.

Explanation: Government-run schools and hospitals provide essential services counted in the tertiary sector's contribution to GDP.

Explanation: Reduced transaction and transport costs increase market access and productivity; prompt communication allows coordination across sectors and enables new service models (e.g., e-commerce, telemedicine).

Explanation: Development often begins with industrialisation (secondary growth) and later a dominant services sector as incomes rise and demand changes.

Explanation: A large employment share with low GDP share indicates per-worker output is low, often due to small landholdings, traditional methods, and lack of capital.

Explanation: Banking = service (tertiary). Fishing = extraction of natural resources (primary). Steel production = manufacturing (secondary).

Explanation: Mechanisation and higher yields mean fewer workers produce the same output, while service industries absorb labour with higher wages.

Explanation: Organized firms follow labour laws and often provide written contracts, pensions, and regulated working conditions.

Explanation: The unorganized sector often has casual employment, variable income and limited legal protections.

Explanation: Social security reduces vulnerability; skills increase employability in organized jobs; credit helps small enterprises grow and register formally.

Explanation: Informal work is dispersed and sometimes seasonal; administrative burdens and taxes can push small enterprises away from formal registration.

Explanation: Training equips workers with required skills for industry/services; access to credit helps start micro/small enterprises or fund vocational training.

Explanation: Machines replace manual labor in many tasks; displaced workers may migrate to towns seeking non-farm employment.

Explanation: Education enhances employability in manufacturing and services; it supports technological adoption and higher-value economic activities.

Explanation: Services can generate high incomes and exports (IT, finance). But over-reliance on certain service exports or urban services can create inequality and external vulnerability.