People bid farewell to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Xue Yuge)

People are seen on their way to bid farewell to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Chen Sihan)

People are seen on their way to bid farewell to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Chen Sihan)

People are seen on their way to bid farewell to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Chen Sihan)

People lay flowers to pay their homage to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Chen Sihan)

People are seen on their way to bid farewell to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Chen Sihan)

Deng Ze, wife of deceased scientist Yuan Longping, attends his funeral at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Xue Yuge)

People are seen on their way to bid farewell to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Chen Sihan)

People lay flowers to pay their homage to deceased scientist Yuan Longping at the Mingyangshan funeral parlor in Changsha, central China's Hunan Province, May 24, 2021. China held a memorial service for Yuan Longping, known as the father of hybrid rice, Monday morning. The top rice scientist, who developed the first high-yield hybrid rice strain in 1973, died of organ failure at 91 last Saturday in Changsha. (Xinhua/Chen Sihan)