Class Test(2) Explanation of Concepts: 1. Natural selection(适应自然环境条件的个体被保存下来) 2. Artificial selection(适应人类需要的个体被保存下来) 3. Individual selection(以单株为单位进行选择) 4. Bulk selection( Mass selection)(将选择优良单株混合种 植进行鉴定) 5. Group bulk selection(将选择的优良单株按一定的重要性 状进行分类,在类内进行混合选择)Class Test (2) Explanation of Concepts: 1. Natural selection (适应自然环境条件的个体被保存下来) 2. Artificial selection (适应人类需要的个体被保存下来) 3. Individual selection (以单株为单位进行选择) 4. Bulk selection (Mass selection) (将选择优良单株混合种 植进行鉴定) 5. Group bulk selection (将选择的优良单株按一定的重要性 状进行分类,在类内进行混合选择)