7.4 Trophic levels in an ecosystem (biology only)

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Question 11
Medium

A food for pet bearded dragons contains dried silkworms.

The food chain is:

Mulberry tree⟶Silkworm⟶Bearded dragon \text{Mulberry tree} \longrightarrow \text{Silkworm} \longrightarrow \text{Bearded dragon} Mulberry tree⟶Silkworm⟶Bearded dragon
a.

What is the trophic level of the bearded dragon?

  • 1
  • 2
  • 3
[1]
b.

Match each organism (Silkworm, Bearded dragon, Mulberry tree) to the correct description of its position in this food chain:

  • Descriptions: Herbivore, Producer, Secondary consumer, Tertiary consumer
[3]
c.

Name the chemical process the mulberry tree uses to produce glucose.

[1]
d.

Some of the silkworm's biomass does not become part of the bearded dragon's biomass. What is one reason why?

  • Some of the silkworm is used for the bearded dragon to grow
  • The bearded dragon produces waste in faeces
  • The mulberry leaf is eaten by the bearded dragon
[1]
e.

A new reptile food has been developed which is made from black soldier fly larvae instead of silkworms. In the processing facility, these larvae are fed on vegetables.

Which of the following describes the correct shape of the pyramid of biomass representing this new food chain (vegetables, black soldier fly larvae, and bearded dragons)?

  • An inverted pyramid structure which is narrowest at the bottom and widest at the top.
  • A standard pyramid structure which is widest at the bottom (vegetables), narrower in the middle (black soldier fly larvae), and narrowest at the top (bearded dragons).
  • A diamond-like structure which is widest in the middle (larvae) and narrow at both ends (vegetables and bearded dragons).
[1]
f.

Beef from cattle is also used to make some reptile food. Cows release methane. The company that makes reptile food from black soldier fly larvae made the statement:

"Reptile food made from black soldier fly larvae is more sustainable than reptile food made from beef."

Identify two reasons from the list below that support the company's statement:

  • Bearded dragons will eat more black soldier fly larvae than beef.
  • Farming cattle requires significantly more land and water resources than breeding black soldier fly larvae.
  • Fewer cattle being farmed will reduce methane emissions, slowing down global warming.
  • Fewer black soldier fly larvae than cows are needed to produce the same mass of reptile food.
  • The food chain for reptile food made from black soldier fly larvae contains more trophic levels.
[2]

7.4 Trophic levels in an ecosystem (biology only) Questions

  1. GCSE
  2. /Biology
  3. /7.4 Trophic levels in an ecosystem (biology only)