Biology B (9-1) - Twenty First Century Science Suite J257 9-1: Living together – food and ecosystems Topical Past Paper Questions

Fig. 4.1 shows a complete food chain for a small pond. (a) Which organism is the source of biomass for all other organisms in the food chain? (b) Explain why phytoplankton are producers. Use evidence from Fig. 4.1. (c) Explain why zooplankton are not producers. Use evidence from…

Fungi are a type of organism that live in soil. They are eukaryotic. (a) Fungi use their genome to make proteins, like humans. (i) Describe what the fungi's genome is and where it is stored. (ii) Explain how the genome is used to make proteins. (b) Fungi release digestive enzymes…

Layla is setting up a compost bin, as shown in Fig. 7.1. Fig. 7.1 (a) To make good compost, the waste added to the bin should be 50% green (such as grass cuttings) and 50% brown (such as dead leaves). Today, Layla has added 1.1 kg of grass cuttings and 1.4 kg of dead leaves. Calc…