CBSE CLASS 10 BIOLOGY MODEL PAPER 2026: THE ULTIMATE PRACTICE SET

Biology in the CBSE 10 class board exam 2026 isn't just about drawing pretty flowers; it's about understanding the intricate "machinery" of life. This section usually carries a significant weightage in the Science paper, and the key to scoring a 25/25 lies in labeling accuracy and conceptual clarity.

This model paper covers all essential chapters: Life Processes, Control and Coordination, How do Organisms Reproduce?, Heredity, and Our Environment.

SECTION A: OBJECTIVE TYPE QUESTIONS (1 MARK EACH)

Q1. Which of the following events does NOT occur during photosynthesis?

(a) Absorption of light energy by chlorophyll.

(b) Reduction of carbon dioxide to carbohydrates.

(c) Oxidation of carbon to carbon monoxide.

(d) Conversion of light energy to chemical energy.

Q2. The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in:

(a) Cytoplasm

(b) Mitochondria

(c) Chloroplast

(d) Nucleus

Q3. Assertion (A): The length of the small intestine differs in various animals.

Reason (R): Herbivores need a longer small intestine to allow cellulose to be digested.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

Q4. In a pea plant cross between a pure tall (TT) and a pure short (tt) plant, the percentage of tall plants in the $F_2$ generation is:

(a) 25%

(b) 50%

(c) 75%

(d) 100%

SECTION B: VERY SHORT ANSWER QUESTIONS (2 MARKS EACH)

Q5. State the role of the following in the human respiratory system:

  1. Alveoli: (Site of gas exchange).

  2. Diaphragm: (Helps in changing the volume of the chest cavity).

Q6. Name the plant hormones responsible for:

  1. Growth of the stem.

  2. Inhibition of growth and wilting of leaves.

SECTION C: SHORT ANSWER QUESTIONS (3 MARKS EACH)

Q7. (a) What is "Double Circulation"?

(b) Why is it necessary for mammals and birds to separate oxygenated and deoxygenated blood?

Q8. Explain the process of "Reflex Action" with the help of a flowchart showing the Reflex Arc.

Q9. Differentiate between Aerobic and Anaerobic Respiration.

FeatureAerobic RespirationAnaerobic Respiration
OxygenRequires OxygenOccurs in absence of Oxygen
EnergyLarge amount released (38 ATP)Very little energy released (2 ATP)
End Products$CO_2$ and $H_2O$Ethanol/$CO_2$ or Lactic Acid

SECTION D: LONG ANSWER QUESTIONS (5 MARKS EACH)

Q10. (a) Draw a neat labeled diagram of the Human Male Reproductive System.

(b) What is the role of the Prostate gland and Seminal vesicles?

(c) Why are testes located outside the abdominal cavity in the scrotum?

Shutterstock

Q11. (a) Define "Transpiration." What are its two main functions in plants?

(b) How does the "Transpiration Pull" help in the ascent of sap?

SECTION E: CASE-BASED QUESTIONS (4 MARKS)

Q12. Case Study: Energy Flow in an Ecosystem

In an ecosystem, the flow of energy is unidirectional. According to the 10% Law, only 10% of the energy is transferred from one trophic level to the next.

  1. If 20,000 J of energy is available at the Producer level (Plants), how much energy is available to the Secondary Consumer? (1M)

  2. Why are food chains generally limited to 3 or 4 trophic levels? (1M)

  3. What is "Biological Magnification"? Give an example. (2M)

✅ ANSWER KEY & QUICK TIPS

  • Q1: (c) Oxidation of carbon to CO is not part of photosynthesis.

  • Q2: (b) Mitochondria.

  • Q3: (a) Both true; herbivores need more time to break down cellulose.

  • Q12 (1): Plants (20,000 J) → Primary (2,000 J) → Secondary (200 J).

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