Hello aspirant,

When anyone fill-up the form of GATE, one have to decide that he/she want to give two papers or one paper.

Here paper stands for exams, you can give two exams in a day or alternative days according to the GATE schedule or can give one exam as usual.

As you have selected Zoology Life Sciences in PAPER 1, and if you don't want to give any other exam on GATE, you shouldn't fill the box of Paper 2 it should be remain blank. Or if you want to give another exam of GATE you can fill that blank according to your interest, but taking consideration to the schedule.

For more information regarding GATE exam, you can visit the link given below,

https://engineering.careers360.com/articles/all-about-gate

Hope it helps you..

Best of luck..