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

 

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

In the CBSE 10 class board exam 2026, Biology requires a mix of sharp memory and analytical thinking. You cannot just memorize diagrams; you must understand the "why" behind every biological process.

This paper follows the latest competency-based pattern. It ensures you are ready for those tricky Assertion-Reason and Case-Based questions.

SECTION A: OBJECTIVE TYPE QUESTIONS (1 MARK EACH)

Q1. The opening and closing of the stomatal pore depends upon:

  • (a) Oxygen

  • (b) Temperature

  • (c) Water in guard cells

  • (d) Concentration of $CO_2$

Q2. Which part of the human brain is responsible for maintaining posture and equilibrium of the body?

  • (a) Forebrain

  • (b) Cerebellum

  • (c) Medulla

  • (d) Pons

Q3. In a pea plant, a tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in the $F_2$ generation will be:

  • (a) 1:3

  • (b) 3:1

  • (c) 1:1

  • (d) 2:1

Q4. Assertion (A): The muscular walls of the ventricles are thicker than those of the atria.

Reason (R): Ventricles have to pump blood into various organs with high pressure.

  • (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.

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

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

  1. Bile juice

  2. Trypsin

Q6. What is the significance of "Translocation" in plants? Name the tissue responsible for it.

SECTION C: SHORT ANSWER QUESTIONS (3 MARKS EACH)

Q7. Explain the process of "Double Circulation" in humans. Why is it necessary for warm-blooded animals?

Q8. (a) What is "Reflex Action"?

(b) Draw a schematic representation of a Reflex Arc.

Q9. Define "Speciation." List two factors that could lead to the rise of a new species.

SECTION D: LONG ANSWER QUESTIONS (5 MARKS EACH)

Q10. (a) Draw a neat labeled diagram of the human female reproductive system.

(b) What happens when the egg is not fertilized? Explain the process of menstruation.

Q11. (a) Differentiate between Aerobic and Anaerobic respiration.

(b) Write the three pathways of glucose breakdown in different organisms.

SECTION E: CASE-BASED QUESTIONS (4 MARKS)

Q12. Case Study: Energy Flow in an Ecosystem

In an ecosystem, energy flows from one trophic level to another. According to the 10% law, only 10% of the energy is available to the next level. This limits the number of trophic levels in a food chain.

  1. Why is the flow of energy in an ecosystem "unidirectional"? (1M)

  2. If 10,000 J of energy is available at the producer level, how much energy will be available to the tertiary consumer? (1M)

  3. What is "Biological Magnification," and how does it affect humans? (2M)

✅ ANSWER KEY & TOPPER'S SOLUTIONS

  • Q1: (c) The swelling and shrinking of guard cells due to water movement controls the pore.

  • Q2: (b) Cerebellum (part of the Hindbrain).

  • Q4: (a) Both are true; thick walls are needed for high-pressure pumping to the body.

  • Q5: Bile emulsifies fats; Trypsin digests proteins in the small intestine.

  • Q12 (Part 2): Producer (10,000J) $\rightarrow$ Primary (1000J) $\rightarrow$ Secondary (100J) $\rightarrow$ Tertiary (10J). Answer: 10 J.

Topper's Tip for 2026: In Biology, always use a ruler for labeling lines. Ensure all labels are on one side (usually the right) to make your diagram look professional and easy to grade.

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