Questions the herring gull




Дата канвертавання22.04.2016
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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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(c) Discuss how this interbreeding in gulls may make accurate classification difficult.



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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.



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Number

Answer

Acceptable answers

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(a)(i)

hybridisation

Ignore references to interbreeding

(1)

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(a)(ii)

C

 

(1)



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(b)

Genus

 

(1)

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(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)

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Answer

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(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)


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