Introduction:
The Indian economy is classified into three sectors - primary, secondary, and tertiary. Each sector contributes differently to the Gross Domestic Product (GDP) of the country. In this response, we will analyze the share of these sectors in the GDP of India in the years 2000 and 2013.

Share of Three Sectors in GDP:
1. Primary Sector:
- The primary sector includes activities related to natural resources, such as agriculture, forestry, fishing, mining, etc.
- In 2000, the primary sector contributed around 25% to India's GDP.
- By 2013, the share of the primary sector in GDP had decreased to around 17%.
- This decline can be attributed to the growth of the secondary and tertiary sectors and the shift towards a more industrialized economy.

2. Secondary Sector:
- The secondary sector comprises activities that involve manufacturing and construction.
- In 2000, the secondary sector contributed around 24% to India's GDP.
- By 2013, the share of the secondary sector in GDP had increased to around 26%.
- This growth can be attributed to increased industrialization, manufacturing activities, and infrastructure development in the country.

3. Tertiary Sector:
- The tertiary sector includes activities related to services, such as trade, transport, communication, banking, education, healthcare, etc.
- In 2000, the tertiary sector contributed around 51% to India's GDP.
- By 2013, the share of the tertiary sector in GDP had increased to around 57%.
- This growth can be attributed to the expansion of services, increased urbanization, and the rise of the middle class in India.

Conclusion:
In conclusion, the share of the three sectors in India's GDP has undergone significant changes between 2000 and 2013. The primary sector's contribution has decreased, while the secondary and tertiary sectors have experienced growth. This shift reflects the country's transition towards a more industrialized and service-oriented economy. The increasing share of the tertiary sector highlights the importance of services in India's economic development.

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