7.4 Trophic levels in an ecosystem (biology only)

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Question 4
Medium

A feed for domestic chickens contains dried snails.

The food chain is:

Clover⟶Snail⟶Chicken\text{Clover} \longrightarrow \text{Snail} \longrightarrow \text{Chicken}Clover⟶Snail⟶Chicken

a.

What is the trophic level of the chicken?

  • 1
  • 2
  • 3
[1]
b.

Match each organism (Snail, Chicken, Clover) to the correct description of its position in this food chain:

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

Name the chemical process clover uses to produce glucose.

[1]
d.

Some of the snail's biomass does not become part of the chicken's biomass. What is one reason why?

  • Some of the snail is used for the chicken to grow
  • The chicken produces waste in faeces
  • The clover is eaten by the chicken
[1]
e.

A new chicken feed has been developed which is made from black soldier fly larvae instead of snails. In the breeding facility, the larvae are fed on organic vegetable scraps.

Which of the following describes the correct shape of the pyramid of biomass representing this new food chain (vegetable scraps, larvae, and chickens)?

  • 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 (vegetable scraps), narrower in the middle (larvae), and narrowest at the top (chickens).
  • A diamond-like structure which is widest in the middle (larvae) and narrow at both ends (vegetable scraps and chickens).
[1]
f.

Pork from pigs is also used in some domestic animal feeds. Pigs release greenhouse gases and require vast areas of arable land for feed crop cultivation. The company that makes chicken feed from larvae made the statement:

"Chicken feed made from black soldier fly larvae is more sustainable than animal feed made from pork."

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

  • Chickens will eat more larvae than pork.
  • Farming pigs needs significantly more land to grow feed than breeding larvae.
  • Fewer pigs being farmed will reduce greenhouse gases and slow down global warming.
  • Fewer larvae than pigs are needed to produce the same mass of feed.
  • The food chain for chicken feed made from larvae contains more trophic levels.
[2]

7.4 Trophic levels in an ecosystem (biology only) Questions

  1. GCSE
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