Which of the following solar terms reflects the phenological phenomenon of natural organisms? 1 .thorn 2. Qingming 3. Grain Rain 4. Xiaoman 5. Mangzhong 6. Egret

Those natural phenomena that are influenced by the environment (climate, hydrology, soil) and have annual cycles are all phenological phenomena. It includes three aspects: first, the germination, leaf spreading, flowering, leaf discoloration and defoliation of various plants; Second, the first song, the last song, leaving, hibernation, etc. of migratory birds, insects and other animals. ; Third, some hydrometeorological phenomena, such as first frost, last frost, freezing, melting, first snow, last snow and so on.

the following

1. Odor refers to insects, hibernating animals, etc. Waking up means that spring has come. (2)

2. Xiaoman means that the seeds of summer crops are full, but not yet mature. ( 1)

3. Miscanthus, which means the crops are mature (2)

So choose a.