Question

If you removed the tertiary consumers from a food web, what would be the response of the primary consumers

Answer 1

The secondary consumers would be overpopulated with no one to consume them. Then the primary consumers will decrease. 

Answer 2

I think .....most affect will go on producers ....but still number of primary consumer decreases a lot as second consumer will increase in number....or may be all the food chain will be lost !!!