Problem: Double fertilization refers to a process in which two sperm cells fertilize cells in the ovary. This process begins when a pollen grain adheres to the stigma of the pistil (female reproductive structure), germinates, and grows a long pollen tube. While this pollen tube is growing, a haploid generative cell travels down the tube behind the tube nucleus. The generative cell divides by mitosis to produce two haploid (n) sperm cells. As the pollen tube grows, it makes its way from the stigma, down the style and into the ovary. Here the pollen tube reaches the micropyle of the ovule and digests its way into one of the synergids, releasing its contents (which include the sperm cells). The synergid that the cells were released into degenerates and one sperm makes its way to fertilize the egg cell, producing a diploid (2n) zygote. The second sperm cell fuses with both central cell nuclei, producing a triploid (3n) cell. As the zygote develops into an embryo, the triploid cell develops into the endosperm, which serves as the embryo's food supply. The ovary now will develop into fruit and the ovule will develop into seed.
What serves as the embryo's food supply?
The answer is the following: endosperm

Problem: After the early 20th century revolutions, shifting alliances of China's regional warlords waged war for control of the Beijing government. Despite the fact that various warlords gained control of the government in Beijing during the warlord era, this did not constitute a new era of control or governance, because other warlords did not acknowledge the transitory governments in this period and were a law unto themselves. These military-dominated governments were collectively known as the Beiyang government. The warlord era ended around 1927.
Why was there not a new era of governance in Beijing? 
The answer is the following: because other warlords did not acknowledge the transitory governments in this period and were a law unto themselves.

Problem: The 50th anniversary of his death was celebrated on 3 June 2013 by Pope Francis, who visited his tomb and prayed there, then addressing the gathered crowd and spoke about the late pope. The people that gathered there at the tomb were from Bergamo, the province where the late pope came from. A month later, on 5 July 2013, Francis approved Pope John XXIII for canonization, along with Pope John Paul II without the traditional second miracle required. Instead, Francis based this decision on John XXIII's merits for the Second Vatican Council. On Sunday, 27 April 2014, John XXIII and Pope John Paul II were declared saints on Divine Mercy Sunday.
On what date was John XXIII and Pope John Paul II declared saints?
The answer is the following: Sunday, 27 April 2014

Problem: The Science Fiction Hall of Fame inducted Spielberg in 2005, the first year it considered non-literary contributors. In November 2007, he was chosen for a Lifetime Achievement Award to be presented at the sixth annual Visual Effects Society Awards in February 2009. He was set to be honored with the Cecil B. DeMille Award at the January 2008 Golden Globes; however, the new, watered-down format of the ceremony resulting from conflicts in the 2007–08 writers strike, the HFPA postponed his honor to the 2009 ceremony. In 2008, Spielberg was awarded the Légion d'honneur.
When did Spielberg win the Cecil B. DeMille Award?
The answer is the following:
2009