A nursery produces 240 clones from one disease-resistant plant using meristem tissue. All are planted in one field.
.1
Explain how meristem cells produce complete plants.
[2 marks].2
Evaluate planting only these clones in one field.
[3 marks]Edexcel GCSE Combined Science June 2024 Biology Paper 1H
5 questions on this paper's topics
26:001 of 5
A pharmaceutical team isolates a compound from willow. Another team studies a mould that prevents nearby bacteria growing.
.1
Explain how these investigations relate to the origins of aspirin and penicillin.
[2 marks].2
Evaluate the claim that a natural origin guarantees a safe and effective medicine.
[2 marks]A news report claims that a gene is a whole chromosome and the genome is the collection of proteins in a cell.
.1
Correct both claims using the relationships between DNA, genes, chromosomes and the genome.
[2 marks].2
Suggest two benefits of studying human genomes.
[2 marks]Eighteen approximately equal cells span a field diameter of 0.90 mm with no gaps.
.1
Estimate the mean cell width in micrometres.
[2 marks].2
Suggest why an individual cell may differ from this estimate.
[2 marks]During exercise a patient's heart rate is 120 beats/min and each side pumps 110 cm³ per beat. Cardiac output is the volume pumped by one side per minute.
.1
Calculate cardiac output in dm³/min.
[2 marks].2
Explain how increased cardiac output supports exercise.
[3 marks]