The Bihar Board Class 10 examinations are one of the most important milestones in a student’s academic journey. Among all the subjects, Biology plays a vital role in science stream preparation as it covers key concepts of life processes, human physiology, genetics, environment, and natural resources. Many students look for a reliable guess paper to practice before the final exam so that they can revise all the important topics in less time.
To help Class 10 students of Bihar Board, we have prepared this Class10 Biology Guess Paper 2025, which includes:
Board Class 10 Biology Guess Paper 2025 | 75 Objective, Short & Long Questions
Part A – Objective Questions (Each carries 1 mark)
Q1. The basic unit of life is:
a) Tissue
b) Organ
c) Cell
d) Nucleus
Answer: c) Cell
Q2. Photosynthesis occurs in:
a) Ribosome
b) Chloroplast
c) Mitochondria
d) Nucleus
Answer: b) Chloroplast
Q3. The powerhouse of the cell is:
a) Ribosome
b) Golgi body
c) Mitochondria
d) Endoplasmic reticulum
Answer: c) Mitochondria
Q4. The green pigment in plants is:
a) Hemoglobin
b) Chlorophyll
c) Carotene
d) Melanin
Answer: b) Chlorophyll
Q5. Which gas is released during photosynthesis?
a) CO₂
b) O₂
c) N₂
d) H₂
Answer: b) O₂
Q6. The functional unit of kidney is:
a) Neuron
b) Nephron
c) Alveoli
d) Ureter
Answer: b) Nephron
Q7. The largest gland in human body is:
a) Liver
b) Pancreas
c) Kidney
d) Thyroid
Answer: a) Liver
Q8. The end product of photosynthesis is:
a) Glucose + O₂
b) Protein + CO₂
c) Fat + O₂
d) Water + CO₂
Answer: a) Glucose + O₂
Q9. The excretory product in humans is:
a) Uric acid
b) Urea
c) Ammonia
d) Lactic acid
Answer: b) Urea
Q10. The structural and functional unit of nervous system is:
a) Heart
b) Nephron
c) Neuron
d) Brain
Answer: c) Neuron
Q11. In plants, loss of water in vapor form occurs through:
a) Transpiration
b) Excretion
c) Respiration
d) Perspiration
Answer: a) Transpiration
Q12. The smallest bone in the human body is:
a) Stapes
b) Femur
c) Tibia
d) Humerus
Answer: a) Stapes
Q13. Which part of the brain controls balance of the body?
a) Cerebrum
b) Cerebellum
c) Medulla
d) Pons
Answer: b) Cerebellum
Q14. The voice box in humans is called:
a) Pharynx
b) Larynx
c) Epiglottis
d) Trachea
Answer: b) Larynx
Q15. In plants, transport of food occurs through:
a) Xylem
b) Phloem
c) Cambium
d) Cortex
Answer: b) Phloem
Q16. Which of the following is an example of asexual reproduction?
a) Fertilization
b) Budding
c) Pollination
d) Fusion of gametes
Answer: b) Budding
Q17. Fertilization in humans occurs in:
a) Uterus
b) Ovary
c) Fallopian tube
d) Vagina
Answer: c) Fallopian tube
Q18. Which hormone regulates sugar level in blood?
a) Adrenaline
b) Insulin
c) Thyroxine
d) Testosterone
Answer: b) Insulin
Q19. The exchange of gases in lungs takes place in:
a) Bronchi
b) Alveoli
c) Trachea
d) Diaphragm
Answer: b) Alveoli
Q20. The site of protein synthesis is:
a) Mitochondria
b) Ribosome
c) Lysosome
d) Nucleus
Answer: b) Ribosome
Q21. The universal donor blood group is:
a) A
b) B
c) AB
d) O
Answer: d) O
Q22. The universal recipient blood group is:
a) AB
b) A
c) B
d) O
Answer: a) AB
Q23. Which part of plant absorbs water?
a) Leaf
b) Stem
c) Root hair
d) Flower
Answer: c) Root hair
Q24. The process of conversion of glucose into alcohol is called:
a) Respiration
b) Photosynthesis
c) Fermentation
d) Transpiration
Answer: c) Fermentation
Q25. Movement of food in alimentary canal is due to:
a) Circulation
b) Transpiration
c) Peristalsis
d) Digestion
Answer: c) Peristalsis
Q26. Which vitamin is synthesized in skin by sunlight?
a) Vitamin A
b) Vitamin D
c) Vitamin C
d) Vitamin K
Answer: b) Vitamin D
Q27. Which enzyme is present in saliva?
a) Lipase
b) Amylase
c) Pepsin
d) Trypsin
Answer: b) Amylase
Q28. Which gas is used in photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide
Q29. The plant which shows double fertilization is:
a) Fern
b) Gymnosperm
c) Angiosperm
d) Algae
Answer: c) Angiosperm
Q30. The sex chromosome of male is:
a) XX
b) XY
c) YY
d) XO
Answer: b) XY
Q31. Who is called father of genetics?
a) Darwin
b) Mendel
c) Lamarck
d) Morgan
Answer: b) Mendel
Q32. Fossils are found in:
a) Igneous rock
b) Sedimentary rock
c) Metamorphic rock
d) Marble
Answer: b) Sedimentary rock
Q33. Which process purifies blood in kidney?
a) Assimilation
b) Filtration
c) Photosynthesis
d) Transpiration
Answer: b) Filtration
Q34. Which organ controls voluntary action?
a) Medulla
b) Spinal cord
c) Cerebrum
d) Cerebellum
Answer: c) Cerebrum
Q35. Which blood cells fight against disease?
a) RBC
b) Platelets
c) WBC
d) Plasma
Answer: c) WBC
Q36. Tubectomy is a method of:
a) Male sterilization
b) Female sterilization
c) Contraceptive pill
d) Condom use
Answer: b) Female sterilization
Q37. Which organ produces bile juice?
a) Stomach
b) Pancreas
c) Liver
d) Small intestine
Answer: c) Liver
Q38. Stomata are found in:
a) Stem
b) Root
c) Leaf
d) Seed
Answer: c) Leaf
Q39. The unit of inheritance is:
a) Chromosome
b) Gene
c) Protein
d) Enzyme
Answer: b) Gene
Q40. Which element is essential for synthesis of protein?
a) Nitrogen
b) Oxygen
c) Phosphorus
d) Sulphur
Answer: a) Nitrogen
Q41. The blood vessel carrying blood from lungs to heart is:
a) Pulmonary artery
b) Pulmonary vein
c) Aorta
d) Vena cava
Answer: b) Pulmonary vein
Q42. Which disease is caused due to deficiency of insulin?
a) Malaria
b) Diabetes
c) Tuberculosis
d) Asthma
Answer: b) Diabetes
Q43. The male reproductive part of flower is:
a) Carpel
b) Ovary
c) Stamen
d) Petal
Answer: c) Stamen
Q44. The female reproductive part of flower is:
a) Stigma
b) Style
c) Carpel
d) Filament
Answer: c) Carpel
Q45. Which part of seed grows into root?
a) Plumule
b) Cotyledon
c) Radicle
d) Endosperm
Answer: c) Radicle
Q46. Plants prepare food by the process of:
a) Respiration
b) Photosynthesis
c) Transpiration
d) Fermentation
Answer: b) Photosynthesis
Q47. Male sex hormone in human is:
a) Estrogen
b) Testosterone
c) Progesterone
d) Insulin
Answer: b) Testosterone
Q48. Which vitamin deficiency causes rickets?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
Answer: d) Vitamin D
Q49. Which disease is caused by mosquito?
a) Diabetes
b) Malaria
c) Tuberculosis
d) Pneumonia
Answer: b) Malaria
Q50. Which process gives us energy from glucose?
a) Respiration
b) Excretion
c) Reproduction
d) Circulation
Answer: a) Respiration
Q51. The site of exchange of materials between blood and tissues is:
a) Arteries
b) Veins
c) Capillaries
d) Heart
Answer: c) Capillaries
Q52. Which organ is known as the control center of the body?
a) Heart
b) Brain
c) Kidney
d) Lungs
Answer: b) Brain
Q53. The process of releasing energy in absence of oxygen is called:
a) Aerobic respiration
b) Anaerobic respiration
c) Photosynthesis
d) Transpiration
Answer: b) Anaerobic respiration
Q54. The genetic material in organisms is:
a) Protein
b) RNA
c) DNA
d) Enzyme
Answer: c) DNA
Q55. Which part of nephron collects urine?
a) Bowman’s capsule
b) Loop of Henle
c) Collecting duct
d) Glomerulus
Answer: c) Collecting duct
Q56. The process of fusion of male and female gametes is:
a) Pollination
b) Fertilization
c) Germination
d) Reproduction
Answer: b) Fertilization
Q57. The lens of eye is held in position by:
a) Iris
b) Ciliary muscles
c) Retina
d) Cornea
Answer: b) Ciliary muscles
Q58. Which type of reproduction produces genetically identical offspring?
a) Sexual
b) Asexual
c) Cross fertilization
d) None
Answer: b) Asexual
Q59. The opening and closing of stomata is regulated by:
a) Guard cells
b) Epidermis
c) Xylem
d) Phloem
Answer: a) Guard cells
Q60. Which scientist proposed the theory of natural selection?
a) Mendel
b) Darwin
c) Lamarck
d) Aristotle
Answer: b) Darwin
Q61. Which gas is essential for aerobic respiration?
a) Nitrogen
b) Oxygen
c) Hydrogen
d) Carbon dioxide
Answer: b) Oxygen
Q62. Which tissue transports water in plants?
a) Xylem
b) Phloem
c) Cambium
d) Epidermis
Answer: a) Xylem
Q63. Which organ stores bile juice?
a) Liver
b) Gall bladder
c) Pancreas
d) Small intestine
Answer: b) Gall bladder
Q64. Which blood cells carry oxygen?
a) Platelets
b) RBC
c) WBC
d) Plasma
Answer: b) RBC
Q65. Which type of reproduction ensures variation in organisms?
a) Asexual
b) Sexual
c) Binary fission
d) Budding
Answer: b) Sexual
Q66. The functional unit of nervous system is:
a) Nephron
b) Neuron
c) Brain
d) Axon
Answer: b) Neuron
Q67. Which disease is caused due to lack of iodine?
a) Rickets
b) Goitre
c) Scurvy
d) Anaemia
Answer: b) Goitre
Q68. Which vitamin deficiency causes scurvy?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
Answer: c) Vitamin C
Q69. Which organ produces insulin?
a) Liver
b) Pancreas
c) Kidney
d) Brain
Answer: b) Pancreas
Q70. In human beings, sex of child is determined by:
a) Father
b) Mother
c) Both parents equally
d) Environment
Answer: a) Father
Q71. The waste product released during respiration is:
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Ammonia
Answer: b) Carbon dioxide
Q72. Which of the following is a renewable resource?
a) Coal
b) Petroleum
c) Water
d) Natural gas
Answer: c) Water
Q73. Which of the following is a greenhouse gas?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
Answer: c) Carbon dioxide
Q74. Which part of eye is responsible for vision?
a) Cornea
b) Retina
c) Iris
d) Lens
Answer: b) Retina
Q75. Which of the following is an example of biodegradable waste?
a) Plastic
b) Glass
c) Vegetable peel
d) Polythene
Answer: c) Vegetable peel
Part B – Short Answer Questions (3 marks each)-Board Class 10 Biology Guess Paper 2025
Q1. Define photosynthesis.
Answer: Photosynthesis is the process by which green plants prepare food using carbon dioxide, water, and sunlight in the presence of chlorophyll, producing glucose and releasing oxygen.
Q2. What is peristalsis?
Answer: Peristalsis is the wave-like muscular contraction of the alimentary canal that pushes food forward during digestion.
Q3. Name three methods of asexual reproduction in organisms.
Answer: Binary fission, budding, and spore formation.
Q4. What are fossils?
Answer: Fossils are the preserved remains or impressions of ancient organisms found in sedimentary rocks that provide evidence of evolution.
Q5. What is transpiration?
Answer: The process of loss of water in the form of vapor through stomata of leaves is called transpiration.
Q6. State the function of platelets in human blood.
Answer: Platelets help in clotting of blood during injury and prevent excessive loss of blood.
Q7. What is synapse?
Answer: Synapse is the junction between two neurons where transmission of nerve impulse occurs through neurotransmitters.
Q8. Write three differences between autotrophic and heterotrophic
nutrition.
Answer:
-
Autotrophs prepare their own food; heterotrophs depend on others.
-
Autotrophs use chlorophyll; heterotrophs do not.
-
Example: Plants (autotrophs), Humans (heterotrophs).
Q9. Why is sustainable management of resources important?
Answer: It ensures resources are used without depletion, conserved for future generations, and helps maintain ecological balance.
Q10. What are Mendel’s laws of inheritance?
Answer:
-
Law of Dominance
-
Law of Segregation
-
Law of Independent Assortment
Part C – Long Answer Questions (5 marks each)- Board Class 10 Biology Guess Paper 2025
Q1. Explain the process of digestion of food in human beings.
Answer:
-
In mouth: food chewed, saliva digests starch.
-
In stomach: gastric juices act on proteins.
-
In small intestine: bile digests fats, pancreatic juice digests proteins & carbohydrates, villi absorb nutrients.
-
In large intestine: water absorbed, waste eliminated.
Q2. Describe the structure and function of the human heart.
Answer:
-
Heart has four chambers: two atria, two ventricles.
-
Right side pumps deoxygenated blood to lungs.
-
Left side pumps oxygenated blood to body.
-
Valves prevent backflow.
-
Function: circulation of blood, supply of oxygen, nutrients, and removal of wastes.
Q3. Explain the process of reproduction in flowering plants.
Answer:
-
Male part (stamen) produces pollen; female part (carpel) has ovules.
-
Pollination transfers pollen to stigma.
-
Fertilization: pollen fuses with ovule.
-
Ovule → seed, Ovary → fruit.
Q4. What is environmental pollution? Explain types and control.
Answer:
-
Air pollution: by smoke, industries → control with filters, clean fuels.
-
Water pollution: by sewage, plastics → control with treatment plants.
-
Soil pollution: by pesticides → control with organic farming.
-
Noise pollution: by traffic → control with rules and awareness.
-
Pollution harms health and biodiversity; must be prevented.
Q5. Write a note on Darwin’s theory of natural selection.
Answer:
-
Proposed by Charles Darwin.
-
Main points: variation exists among organisms, struggle for existence, survival of the fittest, favorable variations are inherited.
-
Example: Evolution of long neck in giraffes.
Board Class 10 Biology Guess Paper 2025 | 75 Objective, Short & Long Questions
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