In plants, photosynthesis occurs mainly within the leaves. Since photosynthesis requires carbon dioxide, water, and sunlight, all of these substances must be obtained by or transported to the leaves. [ Carbon dioxide is obtained through tiny pores in plant leaves called stomata. Oxygen is also released through the stomata. Water is obtained by the plant through the roots and delivered to the. leaves through vascular plant tissue systems. Sunlight is absorbed by chlorophyll, a green pigment located in plant cell structures called chloroplasts.
Super Bowl XLIX, a thrilling contest that came down to an unbelievable interception in the fourth quarter, has become the most watched show in television history. According to numbers released by the ratings agency Nielsen, 114.4 million Americans tuned in to watch the Patriots beat the Seahawks 28 to 24 on Sunday.
Last updated at 12:52 01 May 2005. England's 1966 World Cup victory, an event relived by fans for decades, is the most-watched TV broadcast in British history, research has revealed. A mammoth audience of 32.3 million tuned in to see England's 4-2 triumph over West Germany at Wembley Stadium. That figure is 200,000 higher than the number who watched Princess Diana's funeral in 1997.