Biology Previous Year Questions 2026 | Bihar Police SI

Biology - MOST IMPORTANT Bihar Police SI Previous Year Questions

Practice real questions from previous year exams of Bihar Police SI.

📘 Circulatory System- IV (Heart Chambers)📚 Animals and Heart Chambers
Q1

In the body of which of the following, blood passes through the heart only once in a single cycle?

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📘 Nervous System📚 Receptors (Olfactory, Gustatory, etc.)
Q2

What is the diameter of the human eyeball?

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📘 Digestive System- III: Stomach📚 Gastric Juice
Q3

By which acid is food digested in the stomach?

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📘 Morphology📚 Germination
Q4

What are 'plumule' and 'radicle' related to?

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📘 Important Scientists of Biology📚 Other scientists and discoveries
Q5

Charak was associated with which of the following dynasties?

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📘 Connective Tissue📚 Cartilage
Q6

Which of the following is not a connective tissue?

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📘 Genetic Material📚 DNA
Q7

Which enzyme is used to join DNA fragments in DNA restriction?

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📘 Endocrine Glands- behind stomach📚 Pancreas and secreted hormones
Q8

Islets of Langerhans are part of which organ?

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📘 Digestive System- VI: Pancreas📚 General Facts
Q9

Which is the second largest digestive gland?

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📘 Morphology📚 Transpiration
Q10

When water enters guard cells, they swell and the stomatal pore ________.

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📘 Protozoal Diseases📚 Kala Azar
Q11

Which of the following is a Protozoan disease?

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📘 Macro-Nutrients: Carbohydrates📚 Disaccharides- Maltose, Sucrose, Lactose, Trehalose, etc.
Q12

Which of the following is non-reducing sugar?

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📘 Digestive System- I📚 Steps of Digestion (Ingestion, Digestion, Absorption, Assimilation, Egestion)
Q13

Absorbed fat after digestion in the intestine is transported by-

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📘 Endocrine Glands- Kidney📚 Hormones Secreted by Medulla
Q14

Emergency hormone is called-

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📘 Nervous System📚 Receptors (Olfactory, Gustatory, etc.)
Q15

Gustatory receptors detect______.

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📘 Circulatory System- I (Blood and its Cells)📚 Red Blood Cells
Q16

In polycythemia, cells that increase in number abnormally are:

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📘 Micro-Nutrients: Vitamin-B Complex- Sources and Deficiency Diseases📚 Vitamin B3 (Niacin)
Q17

Pellagra disease is caused by deficiency of which vitamin?

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📘 Botany- types of Hormones📚 Growth Inhibitor- Ethylene, Abscisic Acid
Q18

Which of the following plant hormones inhibits growth?

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📘 Circulatory System- I (Blood and its Cells)📚 Blood vessels- Artery, Vein, Capillary
Q19

Which blood vessels are composed of a single endothelial layer?

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📘 Classification of Kingdom📚 Phylum Mollusca
Q20

Cultivation is done for obtaining pearls -

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