Lesson 2 Sample Exam Questions On Energy Transfer and Food Webs
Lesson 2 Sample Exam Questions On Energy Transfer and Food Webs
Lesson 2 Sample Exam Questions On Energy Transfer and Food Webs
Q1. Scientists investigated a food chain in a wheat field immediately after the wheat had been
harvested.
........................................................................................................................
(1)
(i) Complete the table by calculating the total biomass of red kites and of field mice.
(ii) Use data from your completed table to draw a pyramid of biomass for the food chain
shown in the table.
Page 1 of 15
(c) The total biomass of the red kites is less than the total biomass of the field mice.
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
(2)
(d) The scientists could not find the exact number of organisms in the wheat field.
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
(2)
(Total 10 marks)
Q2. There are many ways to increase the efficiency of food production.
(a) The table shows the energy available to humans from two different food chains.
Wheat → pigs → humans 90 000
(i) Compare the amount of energy the two food chains transfer to humans.
...............................................................................................................
...............................................................................................................
(1)
(ii) Give one reason for the difference in the amount of energy the two food chains
transfer to humans.
...............................................................................................................
...............................................................................................................
(1)
Page 2 of 15
Q3. The photographs show a food chain from a seashore. The photographs are not to the same
scale.
Students estimated the population and biomass of each of the organisms on part of a seashore.
Gull 2 900
(a) (i) Use the data in the table to calculate the biomass of the gull population.
...............................................................................................................
...............................................................................................................
Biomass = ................................... g
(1)
(2)
Page 4 of 15
(b) The biomass of the crab population is much less than the biomass of the limpet
population.
1........................................................................................................................
..........................................................................................................................
2........................................................................................................................
..........................................................................................................................
(2)
(Total 5 marks)
(a) Which diagram shows a pyramid of biomass for the food chain in the picture?
(1)
Page 5 of 15
(b) The plants at the start of the food chain absorb energy.
Give two ways in which energy may be lost from the food chain.
1 .....................................................................................................................
........................................................................................................................
2 .....................................................................................................................
........................................................................................................................
(2)
(Total 4 marks)
Q5. Scientists have found the following food web in the cold Antarctic Ocean.
Some scientists argue that this could lead to a decrease in the numbers of squid and
penguins.
Others argue that the numbers of squid and penguins will stay the same.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(1)
Page 6 of 15
Why they might stay the same.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)
(b) The following information is about the biomass of the organisms in one of the food chains
in the web.
(2)
(c) Explain, as fully as you can, why the conversion of shrimp biomass into cod biomass is
more efficient than that of cod biomass into seal biomass in the cold Antarctic Ocean.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(3)
(d) Boats from many countries fish the Antarctic Ocean. The cod are being overfished. If the
numbers of cod are to increase, the population must be carefully managed.
(i) Suggest two control measures which would prevent a further drop in numbers,
...........................................................................................................................
...........................................................................................................................
(2)
Page 7 of 15