Cambridge & Pearson Edexcel Past Paper Questions
Browse 35,704 questions from Cambridge O-Level & A-Level and Pearson Edexcel IGCSE & IAL exams. Click any question to practice.
The plantain lily, Hosta plantaginea, as shown in Fig. 1.1, is a flowering plant found in Asia. [Figure 1.1] The hydrostatic pressure increases ins...
Scientists investigated the effect of abscisic acid (ABA) on reducing water loss in plants. The scientists predicted that ABA, as well as stimulati...
Seeds of the common stork's-bill, Erodium cicutarium, are shown in Fig. 3.1. [Figure 3.1] The awn is an extension on the E. cicutarium seed. The se...
Compounds containing nitrite ions (NO₂⁻) are present in many foods eaten by humans. Scientists tested the effect of different concentrations of ni...
Which of the following is an example of an involuntary action?
Figure 1 shows a diagram of a plant cell.
Enzymes are biological catalysts that control the rate of metabolic reactions.
A student investigated the effect of light intensity on the rate of photosynthesis in an aquatic plant.
In pea plants, tall (T) is dominant to dwarf (t), and purple flowers (P) are dominant to white flowers (p). A pure-breeding tall pea plant with pur...
Blood contains various components. Which component is responsible for transporting oxygen?
Describe the main differences between asexual reproduction and sexual reproduction.
The diagram shows a section through a flower. [Figure 3]
Explain why enzymes are described as specific.
The graph shows the effect of pH on the activity of two enzymes, P and Q. [Figure 4]
Organisms can be classified into different groups based on their characteristics.
Water is absorbed by plant roots and transported to the leaves.
Malaria is a disease caused by a parasite and transmitted by mosquitoes.
Genetic variation within a population is essential for natural selection.
The diagram shows a food web from a grassland ecosystem.
The menstrual cycle in human females is regulated by hormones.
Microorganisms play essential roles in the carbon cycle.
The kidneys play a vital role in osmoregulation and excretion.
A student investigated the effect of different antibiotic concentrations on bacterial growth.
(a) Explain what is meant by the term sustainable development. (b) Describe two ways in which human activities can lead to deforestation. (c) Expla...