Biology

Yes, you can sit for the aptitude test. You should fulfil all other criteria for the exam. Go to the official website of IISER and kindly look over it.
All the best.

Yes, you can sit for KVPY-SX. KVPY has two sections, each section has 4 parts or subjects, Biology, Physics, Chemistry and Mathematics. You can attempt any three subjects in the first section and any two subjects in the second section. If you are studying both, biology and mathematics, you can attempt all the four subjects and the best of three will be selected. This is applicable only for students currently studying in class 12th, ie, KVPY- SX.

You can apply to IISc, if you are appearing in NEET 2018 and securing a minimum of 60% marks (GN), 54% marks (OBC-NCL), 30% marks (SC/ST/PWD). Admission will be based on your rank.

No, you can can't apply without physics in class 12th.

Definitely, you will get botany or zoology (Hons).

Yes, you are eligible but you need to crack the entrance.

Hello Dear,
After 12th you can't apply for this course. The minimum eligibility of this course is Bachelor's degree in any medical field.

Check out the college predictors below for details:
Andhra Pradesh EAMCET:
https://www.shiksha.com/b-tech/resources/ap-eamcet-college-predictor
TS EAMCET:
https://www.shiksha.com/b-tech/resources/ts-eamcet-college-predictor