MCQ 2_2B Food webs & Pyramids – National 5 Unit 2 Homework

1.	A pyramid of energy shows
	A.	what happens to the solar energy entering a food chain
	B.	how the organisms in a food chain use energy
	C.	the quantity of energy at each stage in a food chain
	D.	how energy is passed from one food chain to another


2.	As energy flows along a food chain it becomes
	A.	less because some is used for growth by the organisms
	B.	less because some is lost by the organisms as movement and heat
	C.	more because some is gained as movement and heat
	D.	more because some is gained as organisms grow


3.	A pyramid of numbers shows the
	A.	number of organisms at each stage in food chain
	B.	number of organisms in different food chains
	C.	number of food chains in a food web
	D.	total number of organisms in a food web


4.	Which of the following describes a community?
	A.	the total number of one species present
	B.	all the living organisms and the non-living parts
	C.	all the living organisms
	D.	all the plants


5.	Which of the following is a correct description of a decomposer?
	A.	A micro-organism which lives inside animals and causes disease
	B.	An organism which releases chemicals from organic waste
	C.	A fungus which grows on living tissue
	D.	A green plant which roots in rotting vegetation


6.	The biomass at each stage in a food chain decreases because
	A.	there are fewer organisms
	B.	the organisms are smaller
	C.	biomass is converted to waste
	D.	less energy is available for growth


7.	Why might a pyramid of biomass not have the same shape as a a pyramid of numbers for the same food chain?
	A.	the biomass is not always related to the number
	B.	the biomass depends on the number
	C.	the number depends on the energy available
	D.	the number is always greater than the biomasss


8.	Which food chain below would give a different pattern in a pyramid of biomass and a pyramid of numbers?
	A.	rose bush → greenfly → ladybird
	B.	algae → waterflea → fish
	C.	grass → rabbit → fox
	D.	seed → vole → kestrel


9.	The niche of an organism is
	A.	where it lives
	B.	its role in the habitat
	C.	the type of habitat where it is found
	D.	the number of organisms present


10.	Which of the following is not a description of a niche?
	A.	tiny decomposer in the soil
	B.	small bird of prey
	C.	microscopic floating producer
	D.	large black beetle


11.	An ecosystem is more stable when it has
	A.	only a few different members of each species
	B.	many different species
	C.	many members of each species
	D.	few different species


12.	Plants convert 1% of the light energy they receive into new plant material. In the food chain below, primroses receive 100 000 units of light energy. Primrose → vole → weasel → owl How much energy is available for the vole?
	A.	10 000 units
	B.	1000 units
	C.	100 units
	D.	10 units


13.	Animals that feed on both plants and animals are called …
	A.	carnivores
	B.	herbivores
	C.	detritivores
	D.	omnivores

14.

The diagram below shows a food web from the seashore.

The mussel can be described as……

producer

primary consumer

secondary consumer

decomposer

15.

The diagram below represents a pyramid of biomass.

producers

prey

predators

herbivores


16.	Which term describes all the organisms living in the same area?
	A.	food web
	B.	ecosystem
	C.	population
	D.	community


17.	Which term describes an animal that eats other animals in food web?
	A.	prey
	B.	predator
	C.	producer
	D.	primary consumer


18.	In a woodland ecosystem which of the following describes a population?
	A.	all the oak trees
	B.	all the plants
	C.	all the plants and animals
	D.	all the oak trees and blackbirds

19.

The diagram below shows part of a food web in an oak woodland.

The use of insecticides in a nearby field resulted in the death of most aphids and caterpillars.

Which line in the table identifies the effect on the numbers of slugs and carnivorous insects?

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