16.3. Sexual reproduction in plants
A subsection of Biology, 0610, through 16. Reproduction
Listing 10 of 316 questions
Coffee is an important crop in some countries. Coffee plants can be crossed to produce new varieties. A valuable variety would produce a high yield in a range of different habitats. Explain how two varieties of coffee plant could be crossed (bred together) to produce an improved variety. Scientists think that they may be able to use genetic engineering to produce valuable new varieties. This involves taking a gene from one species and putting it into another species. Define the term gene. Name the part of the coffee plant cells which contains the genes. New varieties of coffee plant can sometimes appear as a result of a random process. Name this random process. Four new varieties were produced. Some of their properties are shown in Table 9.1. Table 9.1 characteristic of plant Super Plus New Mocha Gro-Better Lo-Cost ability to withstand low temperature high high low low resistance to insect pests low high very high very low height short very tall tall short yield without fertiliser low medium high low In windy conditions the tall varieties of coffee plants blow over, so yields are very poor. Name the two varieties in Table 9.1 that would grow best in windy conditions. Yields can also be affected by whether the farmer can afford expensive chemicals such as pesticides and fertilisers. Name the two varieties in Table 9.1 that would grow best if the farmer could not afford fertiliser. A farm has the conditions shown in Table 9.2. Use information from Table 9.1 to complete Table 9.2. Table 9.2 temperature wind number of pests availability of fertiliser most suitable variety very cold not windy many only small amounts
0610_w13_qp_23
THEORY
2013
Paper 2, Variant 3
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