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RRB Group D Biology — Human Body

Study Material — 1 PYQs (2024–2024) · Concept Notes · Shortcuts

RRB Group D Biology — Human Body is a frequently tested subtopic — 1 previous year questions from 2024–2024 papers are included below with concept notes, key rules and shortcut tricks.

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Previous Year Questions

RRB Group D Biology — Human Body — Past Exam Questions

1 questions from actual RRB Group D papers · all shown free · click option to reveal solution

Exam Q 12024Previous Year Pattern

Which part of the human brain is primarily responsible for regulating body temperature, hunger, and thirst?

Concept Notes

Biology — Human Body— Rules & Concept

Core ConceptRead this first — the foundation of the topic

The human body is a complex biological machine with multiple organ systems working together. For SSC CGL, focus on the 11 major organ systems and their functions. The circulatory system pumps blood through a 60,000-mile network of blood vessels.

The respiratory system exchanges gases 20,000 times per day. The digestive system breaks down food in a 30-foot tube from mouth to anus. The nervous system contains 86 billion neurons processing information at 268 mph.

The skeletal system has 206 bones in adults, while babies are born with 270 bones that fuse over time. The muscular system has over 600 muscles, with the heart being the strongest. The endocrine system produces hormones that regulate growth, metabolism, and reproduction.

The excretory system filters 180 liters of blood daily through kidneys. The reproductive system ensures species continuation. The integumentary system (skin) is the largest organ, covering 20 square feet.

The lymphatic system fights infections and maintains fluid balance.

Exam PatternsWhat examiners ask — read before attempting PYQs

SSC CGL asks 2-3 questions on human body systems. Common topics include blood groups, vitamins, hormones, and organ functions. Questions often test which organ produces what hormone or which vitamin deficiency causes which disease.

ShortcutsUse these to save 30–60 seconds per question

Use the mnemonic 'CRED-MEN-LI' for major systems - Circulatory, Respiratory, Excretory, Digestive, Muscular, Endocrine, Nervous, Lymphatic, Integumentary.

Worked ExampleSolve this step-by-step before moving on
1
Step 1

Identify the function - insulin controls blood sugar.

2
Step 2

Recall endocrine glands - pancreas, thyroid, pituitary, adrenals.

3
Step 3

Match function to gland - pancreas produces digestive enzymes AND insulin. Answer: Pancreas (specifically beta cells in islets of Langerhans). WORKED EXAMPLE 2: Question - How many chambers does human heart have?

1
Step 1

Recall heart structure - divided into upper and lower chambers.

2
Step 2

Count chambers - 2 atria (upper) + 2 ventricles (lower) = 4 total.

3
Step 3

Remember blood flow - right side pumps to lungs, left side pumps to body. Answer: 4 chambers (2 atria, 2 ventricles). FORMULA SHORTCUTS: Blood pressure = Systolic/Diastolic (normal = 120/80 mmHg). Heart rate = 72 beats/minute average. Body temperature = 98.6°F or 37°C. BMI = Weight(kg)/Height²(m²). Normal breathing rate = 16-20 breaths/minute.

Exam TrapsCommon mistakes students make — avoid these

Students confuse arteries and veins. Remember: Arteries carry blood AWAY from heart (both words start with 'A'). Veins carry blood TO heart.

Exception: Pulmonary artery carries deoxygenated blood to lungs, pulmonary veins carry oxygenated blood to heart. Another trap: confusing endocrine and exocrine glands. Endocrine glands release hormones directly into blood (ductless).

Exocrine glands release substances through ducts (like sweat glands). The pancreas is both - releases insulin into blood (endocrine) and digestive enzymes through ducts (exocrine).

Key Points to Remember

  • Human body has 11 major organ systems working together
  • Adult skeleton has 206 bones, newborn has 270 bones that fuse
  • Heart pumps blood through 60,000 miles of blood vessels
  • Normal heart rate = 72 bpm, blood pressure = 120/80 mmHg
  • Kidneys filter 180 liters of blood daily producing 1.5L urine
  • Skin is largest organ covering 20 square feet of surface area
  • Brain contains 86 billion neurons processing at 268 mph speed
  • BMI Formula = Weight(kg) ÷ Height²(m²) for body mass index
  • Pancreas produces both insulin (endocrine) and enzymes (exocrine)
  • Arteries carry blood AWAY from heart, veins carry blood TO heart

Exam-Specific Tips

  • Normal human body temperature is 98.6°F or 37°C
  • Adult human has 206 bones, newborn has 270 bones
  • Human heart has 4 chambers - 2 atria and 2 ventricles
  • Kidneys filter 180 liters of blood per day
  • Normal blood pressure is 120/80 mmHg
  • Human brain weighs approximately 1.4 kg or 3 pounds
  • Largest bone in human body is femur (thighbone)
  • Smallest bone in human body is stapes in middle ear
Practice MCQs

Biology — Human Body — Practice Questions

3graded MCQs · easy to hard · full solution & trap analysis

All MCQs →
Practice 1easy

Which of the following is the primary function of haemoglobin in the human body?

Practice 2medium

Which of the following hormones is produced by the pancreas and helps regulate blood glucose levels?

Practice 3hard

Which of the following statements about the human pancreas is INCORRECT?

60-Second Revision — Biology — Human Body

  • Remember: Arteries carry blood AWAY from heart, veins TO heart
  • Formula: BMI = Weight(kg) ÷ Height²(m²), Normal = 18.5-24.9
  • Mnemonic: CRED-MEN-LI for 9 major body systems
  • Trap: Pancreas is both endocrine (insulin) and exocrine (enzymes)
  • Key numbers: 206 bones, 4 heart chambers, 37°C temperature
  • Vital signs: 72 bpm heart rate, 120/80 BP, 16-20 breaths/min
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