Summary

• Description:

  The PDF document is the Marking Scheme for the Biology Paper 3 Kenya High School 2024 Mock Exam, which is a practical KCSE Trial Exam.

  This document provides the expected answers, observations, and mark allocations for the three questions on the practical paper. The questions assess skills in biochemical food tests, observation and identification of biological specimens, and comparative analysis of structures.

  The marking scheme addresses the following questions:

  • Question 1: This question details an experiment on enzyme activity. The marking scheme provides the expected colour changes for the iodine test on starch solutions mixed with diastase (P2) and boiled diastase (P3). It outlines the marks awarded for correctly identifying the absence of starch in the active enzyme setup and its presence in the control and denatured setups, along with the correct scientific explanations (hydrolysis by diastase and denaturation by boiling).
  • Question 2: This question focuses on the observation of various fruit and seed specimens (Q, R, S, T). The marking scheme lists the correct identification for types of placentation (Marginal and Axile), the parts of a fruit (Exocarp, Mesocarp, Endocarp), and the modes of dispersal (self and animal), along with their corresponding adaptive features (lines of weakness, succulence).
  • Question 3: This question involves comparing features of different plant specimens (R and S1), likely flowers. The answers in the scheme focus on identifying the mode of pollination (insect vs. wind) and the observable adaptive features for each, such as large, conspicuous petals for insect pollination and feathery stigmas for wind pollination. Marks are also allocated for correctly comparing the structures in a table format.
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY

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