Which of the following can be crystallised?

The correct answer is (c) A virus.
Viruses can be crystallized because they are non-living outside a host and have a well-organized structure made of proteins and genetic material. Unlike amoebas, sperms, and bacteria, which are living cells and cannot be crystallized, viruses can exist in a crystalline form.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.