NEET Biology PYQ-Style 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.
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
Answer: Mitochondrial matrix
The Krebs cycle takes place in the mitochondrial matrix. Glycolysis occurs in the cytoplasm, and the electron transport chain is on the inner mitochondrial membrane. So the matrix is where acetyl-CoA is oxidised in the cycle.
The contractile (functional) unit of a skeletal muscle fibre is the:
- A.Myofibril
- B.Sarcomere
- C.Sarcolemma
- D.Sarcoplasm
Answer: Sarcomere
A sarcomere is the region between two successive Z-lines and is the functional contractile unit. Myofibril is the whole fibre-long bundle; sarcolemma is the muscle-cell membrane; sarcoplasm is its cytoplasm.
In humans, which hormone lowers the blood glucose level?
- A.Glucagon
- B.Insulin
- C.Cortisol
- D.Thyroxine
Answer: Insulin
Insulin, secreted by the beta cells of the islets of Langerhans in the pancreas, promotes glucose uptake and lowers blood glucose. Glucagon raises it; cortisol and thyroxine also tend to raise glucose.
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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Unlock all solutions — freeWhich of the following is a purine base found in DNA?
- A.Cytosine
- B.Thymine
- C.Adenine
- D.Uracil
Solution locked
Unlock all solutions — freeThe enzyme that fixes CO₂ in the Calvin cycle is:
- A.PEP carboxylase
- B.RuBisCO
- C.ATP synthase
- D.Nitrogenase
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