9.2 Feeding Relationships

Figure 1 shows a food web from a marine ecosystem.

Figure 1

Identify two secondary consumers in this food web. 

Identify the apex predators from the food web in Figure 1.

With reference to the food web in Figure 1, suggest and explain one effect on crabs if humans were to increase the amount of lobsters caught in this part of the sea.

The role of a producer in a food chain is to produce food.

What process is used and what food type is produced by the majority of producers?

Process ____________________

Food Type __________________

A food chain is shown in Figure 1 below, along with the levels of biomass at each trophic level.

Figure 1

Complete the pyramid of biomass below; the sparrowhawk and blue tit have been completed for you. 

Give one reason why in a pyramid of biomass, each level is narrower than the level below it.

Complete the missing information from Table 1 below.

Table 1

(1)

           Sun → Grass → Rabbit → Bear

(1)

Define the term "ecosystem resilience" in the context of food webs.

What is the primary role of the sun in an ecosystem?

List two factors that can influence the shape of a pyramid of biomass in an ecosystem.