Final answer:
Gehendra Shumsher is considered to be the first scientist of Nepal due to his significant contributions to various scientific fields, his establishment of Nepal's first weather observatory, and his efforts in laying the foundation for modern scientific research in Nepal.
Step-by-step explanation:
Gehendra Shumsher is considered to be the first scientist of Nepal because of his significant contributions to various scientific fields, his instrumental role in establishing Nepal's first weather observatory, and his efforts in laying the foundation for modern scientific research in Nepal. He made notable contributions in the areas of meteorology, botany, and geology, conducting extensive research and publishing scientific papers. His establishment of the weather observatory in Kathmandu allowed for systematic weather monitoring and forecasting in Nepal.