NEET · BiologyUpdated July 2026
NEET Biology Previous Year Questions (Sample) — With Solutions
A sample set of NEET-level Biology questions with answer keys and worked solutions. Attempt each question first, then reveal the solution to check your reasoning.
1
Which of the following is the site of the citric acid (Krebs) cycle in a eukaryotic cell?
- A.Cytoplasm
- B.Mitochondrial matrix
- C.Chloroplast stroma
- D.Nucleus
2
The contractile (functional) unit of a skeletal muscle fibre is the:
- A.Myofibril
- B.Sarcomere
- C.Sarcolemma
- D.Sarcoplasm
3
In humans, which hormone lowers the blood glucose level?
- A.Glucagon
- B.Insulin
- C.Cortisol
- D.Thyroxine
4
Double fertilisation in angiosperms produces:
- A.Two zygotes
- B.A zygote and a primary endosperm nucleus
- C.Two endosperms
- D.An embryo and a seed coat
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Which of the following is a purine base found in DNA?
- A.Cytosine
- B.Thymine
- C.Adenine
- D.Uracil
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The enzyme that fixes CO₂ in the Calvin cycle is:
- A.PEP carboxylase
- B.RuBisCO
- C.ATP synthase
- D.Nitrogenase
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