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OCR MERGED QUESTION PAPER AND MARK SCHEME A Level Biology AH420/02Biological diversity FOR JUNE 2024 $11.89   Add to cart

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OCR MERGED QUESTION PAPER AND MARK SCHEME A Level Biology AH420/02Biological diversity FOR JUNE 2024

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OCR MERGED QUESTION PAPER AND MARK SCHEME A Level Biology AH420/02Biological diversity FOR JUNE 2024

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  • October 31, 2024
  • 58
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
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williesmaish2999
Friday 14 June 2024 – Morning
A Level Biology A
H420/02 Biological diversity
Time allowed: 2 hours 15 minutes




Turn over

, 2
Section A

You should spend a maximum of 20 minutes on this section.

Write your answer to each question in the box provided.


1 Biomass is transferred through ecosystems.

What process makes biomass available for transfer to the next trophic level in the food chain?

A Excretion

B Growth

C Removal of undigested food

D Respiration


Your answer [1]



2 What explains why food chains rarely have more than five trophic levels?

A Parts of the food organism are not eaten by organisms higher in the food chain.

B Plants absorb only a small proportion of the Sun’s energy.

C There is a limit to the size to which a predator can grow.

D Transfer of biomass between trophic levels is inefficient.


Your answer [1]




© OCR 2024

, 3
3 The rate at which plants produce biomass is known as productivity.

What is a suitable unit with which to measure productivity at different depths in the ocean?

A kg day–1 m–2

B kg day–1 m–3

C kg year–1 m2

D m kg–1 year –1


Your answer [1]



4 Microscopes vary in terms of magnification and resolution.

Which option describes the terms magnification and resolution?

A Magnification is the size of an image under a microscope and resolution is the sharpness of
that image.

B Magnification is the size of the image compared to the actual size and resolution is the ability
to distinguish two objects from one another.

C Resolution is the ability to make small objects appear larger and magnification is the ability
to distinguish two objects from one another.

D Resolution is the size of an image under a microscope and magnification is the sharpness of
that image.


Your answer [1]




© OCR 2024 Turn over

, 4
5 Variation can be under genetic control.

Which statement about the genetic control of variation cannot be true for discontinuous
variation?

A Variation is controlled by a single gene with multiple alleles.

B Variation is controlled by an epistatic interaction between two genes with multiple alleles.

C Variation is controlled by many genes on different chromosomes.

D Variation is controlled by two genes on the same chromosome.


Your answer [1]



6 What is a direct consequence of the genetic code being degenerate?

A It is possible that a mutation could change the sequence of amino acids but leave the
function of the protein unchanged.

B It is possible that a mutation could leave the primary structure of the protein unchanged.

C It is possible that a mutation could leave the sequence of bases unchanged.

D It is possible that a mutation could substitute one amino acid for another with similar
properties.


Your answer [1]



7 Which of the statements describe(s) control of gene expression at the post-transcriptional level?

1 binding of a repressor protein to an operator sequence
2 the removal of introns to form mature RNA
3 editing of primary RNA

A 1, 2 and 3

B Only 1 and 2

C Only 2 and 3

D Only 1


Your answer [1]




© OCR 2024

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