Name: Biology Paper 3: QAC Model – Document ID 20250302001
Brand: 8-4-4 Exams and Tutorials
SKU: 1162
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Biology Paper 3: QAC Model – Document ID 20250302001

Structure of the Document

Header Information:
- The document begins with a header that includes contact information for the Elimu Assistant Team, spaces for students to fill in their names, index numbers, school, and date of examination.
Instructions to Candidates:
- Candidates are instructed to write their personal information in the designated spaces.
- Emphasis is placed on spending the first 15 minutes reading the entire paper before starting the work.
Scoring Breakdown:
- The paper is divided into three main questions, each with a specific maximum score, totaling 40 marks.

Content of the Practical Examination

Question 1: Experimentation with Glucose and Substance Y
- Candidates are provided with a 10% glucose solution and a substance labeled Y (identified as yeast).
- The task is to investigate the reaction between the glucose solution and substance Y, including measuring, observing changes, and recording results.
- The question includes sub-questions requiring candidates to fill in tables, draw conclusions, identify processes (such as fermentation), and answer related inquiries about the experiment.
Question 2: Specimen Analysis
- Candidates are required to analyze provided photographs (labeled A, B1, and B2) and answer questions about the coiled part of a specimen, the type of response it exhibits (thigmotropism), and the biological significance of this response.
- The question also asks about pollination, external features of leaves, and identification of the specimen class based on floral parts.
Question 3: Identification of a Mammalian Organ Section
- This section includes identifying a section through a mammalian organ, labeling parts, and stating their functions.
- Candidates are required to name processes occurring in specific organ parts (glomerulus and Loop of Henle) and identify renal diseases.

Marking Scheme

The document includes a detailed marking scheme for each question, indicating how marks are allocated based on the correctness of answers and the completeness of responses.

Confidential Instructions

The document ends with a section marked “CONFIDENTIAL INSTRUCTION TO SCHOOLS,” indicating that the information is meant only for teachers and school heads to prepare adequately for the practical examination. It emphasizes the importance of keeping this information away from candidates to ensure fairness in the examination process.

Conclusion

Overall, the document serves as a practical examination paper for biology students, guiding them through various experiments, observations, and analyses related to biological processes. It is designed to evaluate their understanding of theoretical concepts through practical application, adherence to scientific methods, and ability to analyze and interpret data.

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Description

Featured Questions

Here are all the featured questions from the “KCSE MOCK-BIOLOGY PAPER 3 QA MODEL20250302001.pdf” document:

Questions

Question 1:
- a) Fill the table below:
  - Tube Observations
    - Boiling Tube
    - Test Tube
- b) What conclusions can you draw from your observations in the test tube?
- c) Name the process that took place in the test tube.
- d) Shake the contents of the boiling tube and using a dropper remove a little of the contents. Transfer a drop to a glass slide; add two drops of methylene blue stain. Cover with a cover slip and observe using a microscope of 10x or 15x eyepiece lens.
  - (i) Draw and label the substance Y which is in the slide.
  - (ii) What is the possible identity of substance Y?
- e) Why was the temperature of the water bath kept between 35 – 38°C?
- f) If the experiment was done under the following conditions, suggest, giving reasons the expected results.
  - (i) Water bath was kept at 100°C.
    - Observations:
    - Reasons:
- g) From the microscope:
  - (i) Name the part labeled Q.
  - (ii) Give the function of part labeled P.
- h) Name the form in which substance Y stores its excess glucose.
Question 2:
- a) Examine photograph A, B1, and B2 carefully and answer the questions that follow.
  - (i) What name is given to the coiled part labeled T found on specimen A?
  - (ii) Name the type of response exhibited by the coiled part on specimen A.
  - (iii) Name the stimulus responsible for the response named in (ii) above.
  - (iv) Explain how the response exhibited by the coiled part on specimen A occurred.
  - (v) State the biological significance of the response described in (iv) above to the survival of the specimen.
- b) Use photographed specimens labeled B1 and B2 above to answer the questions below.
  - (i) State the agent of pollination for the specimen above.
  - (ii) Give a reason for your answer.
  - (iii) Describe the external features of leaves of the specimen B2.
  - (iv) Based on the floral parts, state the class to which specimen B belongs.
  - (v) Give a reason for your answer in (iv) above.
Question 3:
- Below is a section through a mammalian organ.
  - i) Identify the section.
  - ii) Name the parts labeled A, B, and C.
  - iii) State two functions of the photographed specimen.
  - iv) Label on the photograph using G and L the region where the Glomerulus and Loop of Henle are located respectively.
  - v) Name a process that occurs in the glomerulus and Loop of Henle.
    - a) Glomerulus
    - b) Loop of Henle
  - vi) Name two renal diseases.

These questions are designed to assess students’ understanding of various biological concepts and their ability to conduct experiments, analyze results, and apply theoretical knowledge to practical situations.