Explain why plants that are grown commercially are often reproduced by asexual methods.
- (a)Explain why plants that are grown commercially are often reproduced by asexual methods.[5]
- (b)In some parts of the world, bees, which are insects, are being killed in large numbers by a parasite called the varroa mite. Suggest why this is widely considered to be a potentially serious problem to ecosystems.[5]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] mitosis;
- [1] only one parent;
- [1] all cells / organisms produced are genetically identical / clones;
- [1] artificial selection / under human control;
- [1] reproduces selected / desirable features or example ;
- [1] can be done throughout year / in different seasons ;
- [1] no need to rely on pollinators ;
- [1] fast + reason, e.g. no waiting for seeds to form / germinate / grow ;
- [1] bees are pollinators;
- [1] reduced yields / fewer seeds ;
- [1] fewer offspring / plants produced ;
- [1] less plants for herbivores / first trophic level ;
- [1] fewer bees + effect on consumers / food chains / webs / ecosystems / biodiversity ;
- [1] reduced honey production ;
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →