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

 

POST 3: BIOLOGY MODEL PAPER (CBSE 10TH - 2026)

Title: CBSE Class 10 Biology Last Minute Model Paper (Exam Ready 2026)

Labels: Biology, CBSE 2026, Life Processes, Board Exam

Biology: Diagrams & Functional Analysis

In Biology, a well-labeled diagram is worth a hundred words. Focus on the flow of energy and the structure of organs.

Section A: MCQs (1 Mark each)

  1. The kidneys in human beings are a part of the system for:

    • (a) nutrition

    • (b) respiration

    • (c) excretion

    • (d) transportation

  2. Which of the following is a plant hormone?

    • (a) Insulin

    • (b) Thyroxin

    • (c) Oestrogen

    • (d) Cytokinin

Section B: Short Answer (2 Marks each)

  1. What is the difference between an autotroph and a heterotroph?

  2. Name the two components of the peripheral nervous system.

Section C: Analytical (3 Marks each)

  1. Draw a labeled diagram of the human heart and show the direction of blood flow.

    2. Shutterstock

  1. Explain the process of double fertilization in flowering plants.

Section D: Long Answer (5 Marks each)

  1. (a) What is the role of the placenta in the human female reproductive system?

    (b) List three contraceptive methods and explain how they prevent pregnancy.

    (c) Draw the human female reproductive system and label the Ovary and Fallopian tube.

    2. Shutterstock
    Explore

Section E: Case-Study (4 Marks)

  1. Heredity: A cross is made between a homozygous tall pea plant (TT) and a short pea plant (tt).

    • (i) What will be the phenotype of the $F_1$ generation?

    • (ii) What is the ratio of Tall to Short plants in the $F_2$ generation?

    • (iii) State Mendel's Law of Dominance.

Final Biology Tip: Use sharp pencils for diagrams. Label only on the right side of the drawing with straight lines—it makes your paper look like a topper's!


 

Post 3: Biology Answer Key

  • Q1: (c) Excretion.

  • Q2: (d) Cytokinin (Promotes cell division).

  • Q3: Autotrophs produce their own food via photosynthesis (Plants). Heterotrophs depend on others for food (Animals/Fungi).

  • Q4: Cranial nerves (arise from brain) and Spinal nerves (arise from spinal cord).

  • Q5:

    • Shutterstock

Ensure labels for Vena Cava, Aorta, Left Atrium, and Ventricles are correct.

  • Q6: One male gamete fuses with the egg (Syngamy $\rightarrow$ Zygote). The second fuses with two polar nuclei (Triple Fusion $\rightarrow$ Endosperm).

  • Q7: (a) Provides nutrition/oxygen to fetus and removes waste. (b) Barrier (Condoms), Chemical (Pills), Surgical (Vasectomy/Tubectomy).

  • Q8: (i) All Tall plants ($Tt$). (ii) $3:1$ (Tall:Short). (iii) In a hybrid, only the dominant trait expresses itself physically.

 

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