Biology 8461: Organisation Topical Past Paper Questions

Farmers can increase the growth rate of farm animals by controlling the animals' diets. A farmer has 1000 chickens. • The farmer feeds the chickens on seeds from maize plants. • 1 hectare of land produces 16.4 tonnes of maize seeds. • The maize seeds have an energy content of 16…

Organic substances decay into simpler substances. 1 The leaves fall off many trees in autumn. The dead leaves contain carbon compounds and nitrogen compounds. Describe how carbon and nitrogen in compounds in the leaves are recycled and used by living trees. You should include a d…

Water and carbon dioxide are exchanged between leaves and the atmosphere through pores called stomata. 1 Name the cells that control the opening and closing of the stomata. [1 mark] Water moves through a plant in the transpiration stream. 2 Describe two differences between the tr…