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]AQA GCSE Combined Science June 2018 Biology Paper 1H
5 questions on this paper's topics
26:001 of 5
Oxygen volumes collected from pondweed in three 5-minute repeats are 4.5, 5.0 and 5.5 cm³. A second student counts bubbles instead of collecting gas.
.1
Calculate the mean oxygen production rate.
[2 marks].2
Evaluate counting bubbles compared with collecting gas volume.
[2 marks]Root cells absorb nitrate from a solution with a lower nitrate concentration than the cells. A poison stops respiration without damaging the cell membrane.
.1
Explain why nitrate uptake decreases.
[3 marks].2
Explain why water can still cross the membrane.
[2 marks]A campaign says: "Every lung cancer case is caused by smoking, so non-smokers need not consider any cancer risks."
Evaluate the campaign statement.
[6 marks]A patient with influenza asks for antibiotics and takes a painkiller to reduce fever.
.1
Explain why antibiotics do not cure influenza and why the painkiller may still help.
[2 marks].2
Explain why developing drugs against viruses can be difficult.
[2 marks]