问题
问答题
简述生态因子的不可替代性和补偿作用。
答案
参考答案：
（1）不同生态因子对生物的作用不同，但都是必不可少的，如果一个因子缺失会造成生物的死亡，这是生态因子的不可替代性。
（2）若某一生态因子的数量不足，在一定条件下，可以由其他因子的加强而得到补偿，结果仍可以得到相似的生态效应，这是生态因子的补偿作用。
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简述生态因子的不可替代性和补偿作用。
参考答案：
（1）不同生态因子对生物的作用不同，但都是必不可少的，如果一个因子缺失会造成生物的死亡，这是生态因子的不可替代性。
（2）若某一生态因子的数量不足，在一定条件下，可以由其他因子的加强而得到补偿，结果仍可以得到相似的生态效应，这是生态因子的补偿作用。
| 从下面方框中选择适当的选项填入短文中，使短文通顺、完整。其中有两个选项是多余的。 | |
my little sister and me. It was time to send wishes. My father said, "You've done 1______ things for us. On this special day, let me 2______ all the housework for you. " After kissing my mother, my sister said, "Mum, you're a 3______ mum in my eyes." 4______ at my mother's eyes and said, " Dear Mum, I am always waiting for one day when you and Dad get old. " My parents seemed puzzled (困惑) , and I explained, " When you're old, I will take care of you just like you take care of me. " There were tears in their eyes... Yes, 5______ they get old, I will take care of them. These words were in my mind 6______ a long time, and at last I said them to my dear parents. I felt 7______ happy. My parents are just common people, 8______ they're great. Like other parents, they bring us up with love, and give us food and 9______.They teach us how to be real people. My parents have done a lot of things for me and I am very thankful to them. However, they will not always be able to take care of me. One day, they will get old. They may not even be able to take care of 10______. But that doesn't matter. I, their child, will take charge. |
