Which cause speciation according to Hugo de vries ?

Name the plant in which mutations were observed by Hugo deVries.

Of the four major causes for the loss of biodiversity (Alien species invasion habitat loss and fragmentation, over-exploitation and co-extinctions) which according to you is the major cause for the loss of biodiversity? Give reasons in support.

Among the following curves, which is not according to Charle's law ?

According to de- Vries what is saltation?

Pollutant which causes acid rain is

Which of the following causes abortion in ladies?