In short: Diagrams carry 10-15 marks in CBSE Class 10 Science board exam. This guide lists all important diagrams chapter-wise with labeling points — practice these for guaranteed marks.
Why Diagrams Matter
- Direct questions: 3-5 mark questions ask for labeled diagrams
- Support answers: Diagrams in long answers fetch extra marks
- Easy marks: Well-drawn diagrams with correct labels = full marks
Chapter 6: Life Processes
1. Human Digestive System ⭐⭐⭐
Labels to include:
- Mouth (Buccal cavity)
- Salivary glands
- Oesophagus (Food pipe)
- Stomach
- Liver
- Gall bladder
- Pancreas
- Small intestine (Duodenum, Jejunum, Ileum)
- Large intestine (Colon)
- Rectum
- Anus
Key points:
- Show liver on right side
- Pancreas behind stomach
- Small intestine coiled
- Large intestine frames small intestine
2. Human Heart ⭐⭐⭐
Labels to include:
- Right atrium
- Left atrium
- Right ventricle
- Left ventricle
- Superior vena cava
- Inferior vena cava
- Pulmonary artery
- Pulmonary vein
- Aorta
- Tricuspid valve
- Bicuspid valve
- Septum
Key points:
- Left side thicker (pumps to whole body)
- Show arrows for blood flow direction
- Oxygenated blood on left, deoxygenated on right
3. Human Respiratory System ⭐⭐
Labels to include:
- Nasal cavity
- Pharynx
- Larynx
- Trachea (Windpipe)
- Bronchi
- Bronchioles
- Lungs
- Alveoli
- Diaphragm
- Ribs
Key points:
- Right lung has 3 lobes, left has 2
- Show alveoli as grape-like clusters
- Diaphragm at bottom
4. Nephron (Excretory Unit) ⭐⭐⭐
Labels to include:
- Bowman's capsule
- Glomerulus
- Proximal convoluted tubule (PCT)
- Loop of Henle (Descending & Ascending)
- Distal convoluted tubule (DCT)
- Collecting duct
- Afferent arteriole
- Efferent arteriole
- Peritubular capillaries
Key points:
- Glomerulus inside Bowman's capsule
- U-shaped Loop of Henle
- Show blood vessels around tubules
5. Stomata ⭐⭐
Labels to include:
- Guard cells
- Stomatal pore
- Chloroplasts (in guard cells)
- Epidermal cells
- Subsidiary cells
Key points:
- Kidney-shaped guard cells
- Chloroplasts only in guard cells
- Show open and closed states
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Chapter 7: Control and Coordination
6. Human Brain ⭐⭐⭐
Labels to include:
- Cerebrum (Forebrain)
- Cerebellum (Hindbrain)
- Medulla oblongata
- Pons
- Thalamus
- Hypothalamus
- Pituitary gland
- Spinal cord
- Corpus callosum
Key points:
- Cerebrum largest, wrinkled surface
- Cerebellum at back, below cerebrum
- Medulla connects to spinal cord
7. Neuron (Nerve Cell) ⭐⭐
Labels to include:
- Cell body (Cyton)
- Nucleus
- Dendrites
- Axon
- Myelin sheath
- Node of Ranvier
- Axon terminals (Synaptic knobs)
- Schwann cells
Key points:
- Dendrites branched, receive signals
- Axon long, transmits signals
- Show direction of impulse
8. Reflex Arc ⭐⭐
Labels to include:
- Receptor (Sense organ)
- Sensory neuron
- Spinal cord
- Relay neuron (Interneuron)
- Motor neuron
- Effector (Muscle/Gland)
Key points:
- Show stimulus and response
- Arrows showing direction of impulse
- Synapse between neurons
Chapter 8: How Do Organisms Reproduce?
9. Longitudinal Section of Flower ⭐⭐⭐
Labels to include:
- Sepals (Calyx)
- Petals (Corolla)
- Stamen (Anther + Filament)
- Pistil/Carpel (Stigma + Style + Ovary)
- Ovules
- Pollen grains
- Receptacle
- Pedicel
Key points:
- Stamen = male part
- Pistil = female part
- Ovules inside ovary
10. Human Male Reproductive System ⭐⭐
Labels to include:
- Testis
- Epididymis
- Vas deferens
- Seminal vesicle
- Prostate gland
- Urethra
- Penis
- Scrotum
Key points:
- Testes in scrotum (outside body)
- Show path of sperm
11. Human Female Reproductive System ⭐⭐⭐
Labels to include:
- Ovary
- Fallopian tube (Oviduct)
- Uterus
- Cervix
- Vagina
- Fimbriae
- Endometrium
Key points:
- Two ovaries, one on each side
- Fallopian tubes connect ovaries to uterus
- Fertilization occurs in fallopian tube
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Chapter 10: Light — Reflection and Refraction
12. Human Eye ⭐⭐⭐
Labels to include:
- Cornea
- Iris
- Pupil
- Lens
- Ciliary muscles
- Retina
- Optic nerve
- Vitreous humor
- Aqueous humor
- Blind spot
- Yellow spot (Fovea)
Key points:
- Lens behind pupil
- Retina at back
- Optic nerve exits at blind spot
13. Defects of Eye and Correction ⭐⭐
Myopia (Near-sightedness):
- Image forms before retina
- Corrected by concave lens
Hypermetropia (Far-sightedness):
- Image forms behind retina
- Corrected by convex lens
Labels: Eye, Lens, Retina, Corrective lens, Light rays, Image position
14. Refraction through Prism ⭐⭐
Labels to include:
- Incident ray
- Refracted ray
- Emergent ray
- Angle of incidence (i)
- Angle of emergence (e)
- Angle of deviation (δ)
- Angle of prism (A)
- Normal at each surface
15. Dispersion of Light ⭐⭐
Labels to include:
- White light
- Prism
- Spectrum (VIBGYOR)
- Violet, Indigo, Blue, Green, Yellow, Orange, Red
Key points:
- Violet bends most
- Red bends least
Chapter 12: Electricity
16. Electric Circuit Symbols ⭐
Must know symbols:
- Cell and Battery
- Switch (Open/Closed)
- Resistor
- Variable resistor
- Ammeter
- Voltmeter
- Bulb
- Wire junction
17. Domestic Electric Circuit ⭐⭐
Labels to include:
- Main fuse
- Meter
- Main switch
- Live wire (Red)
- Neutral wire (Black)
- Earth wire (Green)
- MCB/Fuse
- Socket
- Bulb
Key points:
- Parallel connection for appliances
- Earth wire for safety
- Fuse in live wire
Chapter 13: Magnetic Effects of Electric Current
18. Electric Motor ⭐⭐⭐
Labels to include:
- Armature (Coil ABCD)
- Permanent magnets (N and S poles)
- Split ring commutator
- Brushes
- Axle
- Battery
Key points:
- Coil rotates between magnets
- Split ring reverses current direction
- Brushes maintain contact
19. Electric Generator (AC) ⭐⭐⭐
Labels to include:
- Armature (Coil)
- Permanent magnets
- Slip rings
- Brushes
- Axle
- Galvanometer/Load
Key points:
- Slip rings (not split rings) for AC
- Mechanical energy → Electrical energy
20. Magnetic Field Lines ⭐
Bar Magnet:
- Lines emerge from N pole
- Enter S pole
- Closed loops
- Never intersect
Current-carrying Conductor:
- Concentric circles
- Direction by right-hand thumb rule
Chapter-wise Diagram Summary
| Chapter | Important Diagrams | Marks |
|---|---|---|
| Life Processes | Heart, Digestive system, Nephron, Stomata | 3-5 each |
| Control & Coordination | Brain, Neuron, Reflex arc | 3-5 each |
| Reproduction | Flower, Male/Female reproductive system | 3-5 each |
| Light | Eye, Defects correction, Prism | 3-5 each |
| Electricity | Circuit diagrams | 2-3 each |
| Magnetism | Motor, Generator | 3-5 each |
Tips for Drawing Diagrams
Do's ✅
- Use pencil for drawing, pen for labels
- Draw large, clear diagrams (at least 1/3 page)
- Label with straight lines (not arrows)
- Write labels horizontally
- Give title below diagram
Don'ts ❌
- Don't draw too small
- Don't use colored pencils (unless specified)
- Don't cross label lines
- Don't forget the title
- Don't leave diagrams unlabeled
Frequently Asked Questions
How many diagrams should I practice?
Focus on the 20 diagrams listed above. These cover 90% of diagram questions in board exams.
Do I need to draw diagrams in long answers?
Yes! Adding a relevant diagram to a 5-mark answer can fetch 1-2 extra marks even if not explicitly asked.
How to remember all labels?
- Draw each diagram 5 times
- Use mnemonics for label sequences
- Practice labeling blank diagrams
- Revise diagrams daily for 2 weeks before exam
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