Parts of a Plant
There are more than 400,000 kinds of plants on Earth. Some plants are as big as tall buildings; others are as small as rice. Plants are key parts of the food circle. They play an important part in the nature because they give out oxygen—the gas that all animals need for breathing.
What is a plant?
Most people have no difficulty finding the differences between an animal and a plant. That is because animals can move around, but plants can’t. What makes a plant a plant? Like animals, plants are living things that are made up of lots of cells (细胞). Unlike animals, plants make their own food by photosynthesis (光合作用). Most plants have roots, stems, and leaves, and most plants reproduce by growing flowers and making seeds. All plants need energy to stay alive and grow, and they get it from sunlight instead of food.
How does a plant grow?
Most animals grow in a certain way, and genes control their growth. That is to say, even when they are small, it’s easy to know what they will look like after they grow up. Plants are different. Their growth is controlled by genes too, but their final shape also depends on where they live. For example, a tree can be big and round if it grows up in an open space, but much taller and thinner if it grows in the woods with other trees all around. Plants are unable to move from one environment to another, so it is important that they are able to get used to the environment.
【小题1】Which of the following is NOT mentioned in Paragraph 1?| A．The number of plants. | B．Different sizes of plants. |
| C．The importance of plants. | D．Planting more trees. |
| A．By comparing. | B．By giving examples. |
| C．By giving numbers. | D．By telling stories. |
| A．Flowers and seeds are the most important parts of a plant. |
| B．Plants and animals grow in the same way. |
| C．Only environment controls the plants’ growth. |
| D．It’s important for the plants to get used to the environment. |
| A．Different Kinds of Plants | B．The Life of Plants |
| C．Plants and Animals | D．All About Plants |
