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]OCR Gateway GCSE Biology June 2022 Paper 3
5 questions on this paper's topics
26:001 of 5
A person with Type 1 diabetes says that insulin lowers blood glucose because it destroys glucose molecules in the bloodstream.
.1
Explain why this explanation is incorrect.
[2 marks].2
Explain why a person with Type 1 diabetes may need insulin treatment even when they avoid sugary foods.
[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]A potometer reservoir initially contains 24.0 cm³ of water. After 90 minutes it contains 17.7 cm³. A sealed control loses no water. The student claims that all 6.3 cm³ must have evaporated from the leaves.
.1
Calculate the shoot's mean uptake rate.
[2 marks].2
Evaluate the claim about evaporation.
[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]