Questions the herring gull

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Дата канвертавання	22.04.2016
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Questions

Q1.
The herring gull

(a) Both white herring gulls and (Alaskan) lesser black backed gulls are found in Britain.

White herring gulls are unable to breed with (Alaskan) lesser black backed gulls. White herring gulls can breed with American herring gulls.

American herring gulls can breed with (Alaskan) lesser black backed gulls. white herring gull (Alaskan) lesser black backed gull

(i) This type of interbreeding between different species is known as

(1)

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(ii) Complete the sentence by putting a cross () in the box next to your answer.

This interbreeding of gulls results in the creation of

(1)

A circular species

B isolation

C ring species

D speciation

(b) The binomial term for the white herring gull is Larus argentatus.

State the level of classification that Larus in the binomial name refers to.

(1)

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(2)

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(d) Gulls belong to the phylum chordata.

Explain which features of gulls enable them to be classified in a vertebrate group.

(3)

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Q2.
Explain why it is difficult to classify some living organisms.

(2)

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Mark Scheme

Q1.

Question Number	Answer	Acceptable answers	Mark
(a)(i)	hybridisation	Ignore references to interbreeding	(1)
Question Number	Answer	Acceptable answers	Mark
(a)(ii)	C		(1)

Question Number	Answer	Acceptable answers	Mark
(b)	Genus		(1)
Question Number	Answer	Acceptable answers	Mark
(c)	A discussion linking the following points in a logical order • classification is based on the premise that separate species do not interbreed (1) • these gulls are interbreeding between species so a single classification of the species is not possible (1)		(2)
Question Number	Answer	Acceptable answers	Mark
(d)	An explanation linking the following points • method of obtaining oxygen through lungs (1) • method of reproduction internal and laying eggs (1) • homeothermic so can maintain internal temperature (1)		(3)

Question Number	Answer	Acceptable answers	Mark
	an explanation linking two of the following • there are variations within a species • some organisms have similar features / features that are common to more than one group / species / kingdom(1) • some closely related species can interbreed / breed with each other (1) • hybrids can be produced (1)	allow references to specific organisms such as the duck billed platypus / axolotl / kiwi	(2)