Practise ecology and environment questions on sampling populations, biodiversity, food chains, biomass pyramids, energy transfer and carbon cycling.
The diagram shows part of a woodland food web.
Which organism is a primary consumer in this food web?
aphid
blackbird
fox
oak tree
Which of these describes the woodland community?
all the abiotic and biotic factors in the area
all the blackbirds in the area
all the different species and the habitat
all the different species in the area
This is one food chain from the food web.
A student counted 20 mice living around 4 oak trees. There were also 2 foxes in the area.
Draw a labelled pyramid of numbers for this food chain on the grid.
Your pyramid should be drawn to scale.
Photosynthesis results in 25000 kJ of energy being transferred to the biomass of the oak trees each year.
Only 8\% of this energy is transferred to the biomass of the 20 mice each year.
Calculate the mean amount of energy transferred to the biomass of one mouse each year.
mean amount of energy = kJ
Explain why only 8% of the energy stored in the biomass of the oak trees is used by the mice for growth.
The diagram shows a cycle found in ecosystems.
Give the name of the cycle.
Which process is represented by the letter W ?
combustion
decomposition
feeding
respiration
Which process is represented by the letter X ?
combustion
decomposition
feeding
respiration
Name a group of organisms that is responsible for decomposition.
Using the recommended amount of fertiliser on a crop increases crop yield. Some farmers think that adding extra fertiliser will give an even greater crop yield.
Some farmers apply more nitrogen fertiliser and more water to their fields than are needed.
Explain the biological consequences of applying more nitrogen fertiliser and more water than needed.
The atmosphere can be polluted by gases such as carbon monoxide released from industry.
Describe the effects of carbon monoxide on the human body.
Which of these is not a greenhouse gas?
carbon dioxide
methane
nitrogen
nitrous oxide