IGCSE Science - Combined (0653) — May–June 2023, Paper 31

Fig. 1.1 shows the parts of an insect-pollinated flower. State the letter in Fig. 1.1 that identifies the: sepal part where fertilisation occurs.

A student measures the melting point of some salty water and some pure water. Table 2.1 shows the results: salty water melting point –5 °C; pure water 0 °C. State the name of one…

Fig. 3.1 shows a group of people keeping warm by a campfire and playing musical instruments. State the process that causes the hot smoke to move upwards from the fire.

Fig. 4.1 shows a model of the human gas exchange system. Draw a label line and the letter D to identify the diaphragm on Fig. 4.1.

Ethane, C2H6, is an alkane. It is one of the saturated hydrocarbons present in refinery gas obtained from petroleum (Fig. 5.1 shows a fractionating column with refinery gas at the…

Fig. 6.1 shows a moving conveyor belt carrying a box (weight 500 N) from the ground up to an aircraft. On Fig. 6.1, draw a force arrow to show the weight of the box. The arrow…

The leaves of some plants have green and white areas; only the green areas of the leaf contain chlorophyll. Fig. 7.1 shows a green and white leaf. Glucose from photosynthesis is…

Copper(II) sulfate, CuSO4, can be made by reacting copper(II) oxide, CuO, with a dilute acid. Complete the word equation for the formation of copper(II) sulfate from copper(II)…

Fig. 9.1 shows a student using a laptop computer with a lamp beside the student. The student sees the light from the lamp reflected in the computer screen. Fig. 9.2 is a diagram…