Fig. 4.1 shows part of a food web from a woodland: mango trees → badgers, mice and horses; grass → horses; mice → badgers and owls; badgers → owls; owls → ticks; horses → ticks.

1. aState the principal source of energy for the web. [1]
2. bIdentify an organism that is both a primary and secondary consumer. [1]
3. cIdentify an organism that is a tertiary consumer. [1]
4. dSuggest the effect of killing all badgers on the population of mice. [1]
5. eGive an explanation for your answer. [2]

You'll mark your own answer against the marking guide when you hand it in.