Extinction of Stellar’s sea cow and passenger pigeon was due to:

1.	Habitat loss and fragmentation	2.	Over exploitation
3.	Invasion of alien species	4.	Co-extinctions

What exotic introduction is threatening indigenous catfishes in our rivers?

Introduction of Lates niloticus led to the extinction of:

Loss of biodiversity may lead to all except:

The main difference between the “Sixth Extinction” and the previous five extinctions is that the sixth extinction:
1. is mainly occurring on islands
2. is mainly affecting plants
3. is occurring at a faster rate
4. does not involve human activities

Which group, amongst the following, has the maximum percentage of species facing threat of extinction?

Which of the following species of tiger has not gone extinct?

The largest carnivorous marsupial that got extinct in 20th century was:
1. Dodo
2. Quagga
3. Thylacine
4. Stellar’s sea cow

Year-to-year variation shown by areas with more species is ................... with respect to areas with less species.

The rivet popper hypothesis was given by: