Topic content:
China is known as the "hometown of gymnosperms" because our country ()
A. Most gymnosperms
B. The most species of seed plants
C. There are peculiar gymnosperms
D. Gymnosperms only grow in China
Best answer:
Biodiversity usually has three levels of meaning, that is, the diversity of biological species, the diversity of genes (heredity) and the diversity of ecosystems. China is very rich in gymnosperms resources. Modern gymnosperms are divided into 5 classes, 9 orders, 12 families, 71 genera, and nearly 800 species. China has the largest number of gymnosperms and the richest resources, including 5 classes, 8 orders, 11 families, 41 genera, 236 species, of which 51 species belong to 7 genera in 1 family. Many are Tertiary relict plants, or "living fossil" plants, accounting for 26.7% of the known species in the world, ranking first in the world. Therefore, China is known as the "hometown of gymnosperms"
Therefore: A
Answer analysis:
There is no explanation for this question
Test core:
Biodiversity: Biodiversity includes biodiversity of biological species, genetic diversity and ecosystem diversity.