class 12th biology model paper year 2024-25 PDF download link

class 12th biology model paper year 2024-25 PDF download link

Tips for Preparation:

1. Understand Diagrams:

   • Practice drawing and labeling key biological diagrams such as the cell structure, heart, DNA, and plant parts.
   • Ensure clarity and accuracy in your sketches.

2. Review Sample Papers:

   • Refer to textbooks or educational websites that offer sample model papers with images.
   • Solve previous years' papers to get acquainted with the format.

3. Use Study Guides:

   • Utilize study guides that include diagrams and explanations for better visual understanding.

4. Online Resources:

   • Websites like studywithjeet, and educational platforms often provide diagrams and practice questions.

5. Flashcards:

   • Create flashcards with diagrams on one side and explanations on the other to test your knowledge.

Instructions:

• Answer all questions.
• Draw neat and properly labeled diagrams wherever required.
• Time management is crucial; allocate time wisely to each section.

12th Biology Model Paper

Time Allowed: 3 Hours
Maximum Marks: 80

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Section A: Multiple Choice Questions (1 mark each)

1. Which of the following is the primary site of photosynthesis in plants?

   • A) Mitochondria
   • B) Chloroplast
   • C) Nucleus
   • D) Ribosome

2. DNA replication occurs during which phase of the cell cycle?

   • A) G1 phase
   • B) S phase
   • C) G2 phase
   • D) M phase

3. The process by which water moves across a semipermeable membrane is called:

   • A) Diffusion
   • B) Osmosis
   • C) Active Transport
   • D) Filtration

(… and so on for a total of 20 MCQs)

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Section B: Short Answer Questions (2 marks each)

1. Define Mendel’s Law of Segregation.

2. Explain the role of ribosomes in protein synthesis.

3. What is the function of the stomata in plant leaves?

4. Describe the structure of a nucleotide.

5. Differentiate between prokaryotic and eukaryotic cells.

(… total of 10 short answer questions)

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Section C: Long Answer Questions (5 marks each)

1. Photosynthesis:

   • a. Write the balanced chemical equation for photosynthesis.
   • b. Describe the light-dependent reactions, including a diagram of a chloroplast thylakoid membrane.

   [Include a diagram of the chloroplast with labeled parts such as thylakoid, granum, stroma, etc.]

2. Genetics:

   • a. Explain the principle of independent assortment.
   • b. Use a Punnett square to predict the offspring of a cross between two heterozygous individuals for a single trait.

   [Include a Punnett square diagram showing the cross and possible genotypes and phenotypes.]

3. Human Physiology:

   • a. Describe the structure and function of the human heart.
   • b. Draw a labeled diagram of the heart showing its chambers, valves, and major blood vessels.

   [Include a labeled diagram of the heart with atria, ventricles, valves, aorta, etc.]

(… total of 4 long answer questions)

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Section D: Diagram-Based Questions (5 marks each)

1. Plant Cell Structure:

   • a. Draw a plant cell and label the following organelles: nucleus, chloroplast, mitochondria, vacuole, and cell wall.
   • b. Briefly describe the function of each labeled organelle.

2. Human Respiratory System:

   • a. Draw a diagram of the human respiratory system.
   • b. Label the major components and explain the pathway of air during respiration.

3. Molecular Biology:

   • a. Illustrate the structure of DNA.
   • b. Indicate the directionality and complementary base pairing.

4. Ecology:

   • a. Draw a simple food chain including producers, consumers, and decomposers.
   • b. Explain the flow of energy through the food chain.