Without plant, people could not live. We eat plants. We breathe the oxygen that plants produce. And we need plants for another reason: we need them for their beauty. Imagine a world with no plants. Imagine no flowers with their sweet smells, their beautiful colors and their lovely shapes. Imagine when the wind blows, not being able to hear the leaves in the trees or watch the branches sway from side to side. Everywhere people need the beauty of plants. That is why we have parks full of trees and flowers. That is why people always try to design houses with room for some grass and a garden. Do you talk to your plants? Do you give them love and attention? Peter Tompkins and Christopher Bird, writers of a book called THE SECRET LIFE OF PLANTS, tell of an experiment in which two seeds were planted in different places. While the plants were growing, one plant was given love and hopeful ideas. The other plant was given only hopeless ideas. After six months, the loved plant was bigger. Under the earth it had more and longer roots; above the earth, it had a thicker stem   and more leaves. According to the passage, which of the following is right?
If there are no flowers, there will be no sweet smells. Without plants, we can't hear the wind. We plant trees to watch the branches sway from side to side. We need plants not only for food and oxygen but also for their beauty.