Hi aspirant,

No chapter is important in biology. If you are particularly talking about NEET examination then whole course of biology without any chapter left must be prepared because approximately 95% paper comes directly from NCERT book of biology. So prepare well.

See, nobody knows what topics will come this year and what will be the division of examination for a particular subject so prepare well.

Check out this link fro important topics and chapters that an individual must prepare without any fail: https://medicine.careers360.com/articles/do-or-die-chapters-for-neet

I hope this information will help you.

Wishing you very good luck:)