A-LevelBiologyBiodiversity and conservationFeb/Mar 2025Paper 4 Q713 Marks
The Sumatran tiger, Panthera tigris sumatrae, is classified as critically endangered on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species™™. [Figure 7.1] shows a Sumatran tiger. (a) Fig. 7.2 shows the number of wild Sumatran tigers in the world between 1970 and 2020. [Figure 7.2] (c) Captive breeding programmes sometimes use IVF. Table 7.1 shows some of the events that occur during an IVF procedure. They are not listed in the correct order. Table 7.1 letter event A sperm added to oocyte B embryo formed C female given hormones to stimulate ovulation D zygote placed in culture medium E embryo placed in uterus of female F zygote formed G oocyte harvested with a fine needle Complete Table 7.2 to show the correct order of the events. One of the events has already been added in the correct position. Table 7.2 correct order letter 1 2 3 4 F 5 6 7
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