A researcher compares disease survival in clones and sexually produced offspring of the same plant species. The clones are grown in dry soil; the sexually produced offspring are grown in moist soil.
Why can the researcher not attribute a survival difference to the method of reproduction alone?
soil moisture also differs and must directly change the reproduction method
soil moisture also differs and could affect the survival of plants
clonal offspring are genetically highly varied and must differ in resistance
sexual offspring are genetically completely identical and must match in resistance
40 exam-style questions on Edexcel GCSE Biology 3.1 Reproduction and meiosis, covering 3.1.1 Advantages and disadvantages of reproduction and 3.1.2 Role of meiotic cell division. Each one has a worked solution and a mark scheme showing where the marks go.