兩篇
Plants need light to grow.In fact a plant cannot grow in the absence of light.Plants majorly act as the producers in the economy therefore,they produce food not only for their own use but also for the use of men.Light is very necessary for the plants because plants take energy from the sunlight and use that energy in making food.Food is in the form of glucose and it is prepared by plants by using carbon dioxide and water in the presence of sunlight.The reaction is as follows:
Carbon dioxide + Water + Light energy ------> Glucose + Oxygen
Therefore,light is very important for the plants for making glucose and to grow.
All living things need light and heat from the sun to live.Plants need light and heat to grow.They use the light from the sun to make food.We cannot make our own food,but plants can.All the food we eat comes from plants in a food chain which starts with the sun.For example,animals need sunlight,too.Just like us,their comes from a food chain which begins with the sun and the plants.
所有生物都要依靠太陽的光和熱而生存.植物需要光和熱才能生長,它們接受陽光制造食物.我們無法自行制造食物,但植物可以.我們所吃的所有食物都來自食物鏈中的植物,而其源頭則是太陽.動物也需要陽光.就象我們一樣,動物也是食物鏈中的一環(huán),而食物鏈正是起源于植物和太陽.