Question 1
FOrchids are plants with valuable flowers. Growers produce large numbers of orchids by tissue culture.
The Figure shows the main stages of tissue culture.
Figure
a.[2]
Explain why the pieces of tissue are placed on a sterile nutrient medium at stage B.
b.[1]
The nutrient medium also contains plant hormones.
Give one reason why.
c.[2]
Explain why all the plants produced at stage D are genetically identical to the parent plant.
d.[1]
Give one advantage of using tissue culture in a plant breeding programme.
4.3 Selective breeding and genetic modification Questions
44 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.