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A Level Biology OCR A Questions

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Overview of A Level in Biology A:

Content is split into six teaching modules:
Module 1 – Development of practical skills in biology
Module 2 – Foundations in biology
Module 3 – Exchange and transport
Module 4 – Biodiversity,evolution and disease
Module 5 – Communication,homeostasis and energy
Module 6 – Genetics,evolution and ecosystems

A Level Biology OCR A Questions

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25 Questions

1. List 4 commercial uses of plant hormones (not including weed-killing, rooting powder & controlling ripening).

Fauna - animals of a particular regionScatter graphPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processSpriacle - small openings along the side of insects where air enters and leaves the body

2. Define fauna.

Spriacle - small openings along the side of insects where air enters and leaves the bodyFauna - animals of a particular regionPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graph

3. State the type of graph used to show whether there is a correlation between two variables.

Spriacle - small openings along the side of insects where air enters and leaves the bodyPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processFauna - animals of a particular regionScatter graph

4. Define spriacle.

Plant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processFauna - animals of a particular regionScatter graphSpriacle - small openings along the side of insects where air enters and leaves the body

5. Describe 3 conservation methods to maintain or restore lowland peat bogs.

Scatter graphPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processFauna - animals of a particular regionPeat bog conservation methods: Ensuring peat and vegetation of surface is as undisturbed and wet as possibleRemoval of seedling trees from the area (trees have high water requirement so remove water from peatland)Controlled grazing to maintain biodiversity of peatland (wide range of habitats for rare insect species bc diverse plants)

6. Define the term conjugated protein.

Plant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processFauna - animals of a particular regionScatter graphConjugated protein - globular proteins that contain a prosthetic group

7. Define acinar cells.

Plant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processAcinar cells - secretory cells that group together to form acini Surround end of a branch of pancreatic duct, secrete pancreatic juice into the lumen of the branchFauna - animals of a particular regionScatter graph

8. Outline how xylem vessels and phloem sieve tubes are produced from meristems.

Fauna - animals of a particular regionProduction of xylem and phloem sieve tubes: Meristematic tissue located between xylem and phloem tissues - vascular cambiumCells originating from this region differentiate into diff cells present in xylem and phloem tissuesPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graph

9. Define systemic circulation.

Systemic circulation - the passage of blood from the left side of the heart through arteries to the capillaries in body tissues where it exchanges O for CO2 and is returned to the right side of the heart by veinsPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processFauna - animals of a particular regionScatter graph

10. Explain why regeneration of NAD is crucial part of either form of fermentation.

Regeneration of NAD: NADH reduces pyruvate/ethanal by donating a hydrogen, regenerating NADAllows glycolysis to take place - allows 2 ATP to be produced (net)Plant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graphFauna - animals of a particular region

11. Describe how hormonal communication works in general.

Fauna - animals of a particular regionHormonal communication: Secreted directly into bloodstream when gland stimulatedTransported in blood plasma, diffuse out of blood and bind to specific receptors for that hormone (on membrane or within cytoplasm) of target cells in the target organsOnce bound, they stimulate target cells to produce a responseScatter graphPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting process

12. Define transpiration pull.

Transpiration pull - the force which aids in drawing the water upward from roots to leaves in order to replace water lost by evaporationPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graphFauna - animals of a particular region

13. Draw a table to compare the structure and function of mRNA, tRNA and DNA.

Scatter graphmRNAtRNADNA StructureLinear, single stranded moleculeContains riboseContains bases A, U, G, CCarries codon sequence complementary to the sequence of the gene Single strand of RNA folded into clover leaf shape with three bases (anticodon) at one end of moleculeContains riboseContains bases A, U, G, CCarries an anticodon which is complementary to the codon on mRNA Double-stranded, antiparallel double helix moleculeContains deoxyriboseContains bases A, T, G, CCarries the original codon complementary to mRNA FunctionCarries genetic information (amino acid sequence order) copied from DNA Delivers correct amino acids to the ribosome in order to make up a polypeptideCarries the genetic material of an organismFauna - animals of a particular regionPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting process

14. What are the chemical used in the Benedict's test? Outline the method & the appearance of a negative/positive result.

Scatter graphFauna - animals of a particular regionBenedict's test Substances used Qualitative Benedict's solution (alkaline solution of copper(II)sulfate)Solution you are testing (reducing/non-reducing sugar) Method Sugar being tested must be in solution so that reducing sugar molecules can expose their aldehyde group in linear formAdd qualitative benedicts solution in equal volume to sample being tested - reactants will be in excess so reaction will be completeHeat mixture to 80+ deg C - catalysing reaction Results Brick red precipitate - Cu2+ ions reduced to Cu+ - brick red color - positive resultNo color change - solution stays blue - negative resultPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting process

15. State the formula for recombination frequency. + explain how to interpret.

Scatter graphFauna - animals of a particular regionRecombination frequency: 50% - no linkage & genes are on separate chromosomesLess than 50% - there is gene linkage & independent assortment has been hinderedPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting process

16. Define density dependent factors. + some examples

Scatter graphFauna - animals of a particular regionPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processDensity dependent factors - force that affects the size of a population of living things in response to the density of the population CompetitionPredationDisease & parasitesWaste accumulation

17. Describe the characteristic features of eukarya domain.

18. Draw a table to show the advantages and disadvantages of open and closed circulatory systems.

Fauna - animals of a particular regionPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graphAdvantagesDisadvantages OpenRequires less energy for distributionMore suitable for animals with slow metabolism and smaller bodyBlood is at low pressure so it is distributed slowlySteep diffusion gradients cannot be maintained for efficient diffusionAmount of haemolymph flowing to particular tissue cannot be variedLittle control of direction of flow & flow is affected by movementClosedBlood is at high pressure so blood flows rapidly meaning faster & more efficient distribution of oxygen & removal of wasteAmount of blood flowing can be adjusted by narrowing blood vesselsSteep diffusion gradients are able to be maintainedRequires more energy compared to openMore complex

19. Define gene flow.

Gene flow - movement of alleles between populationsFauna - animals of a particular regionScatter graphPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting process

20. Define ectotherm.

21. What happens at A1?

Fauna - animals of a particular regionAnaphase 1: Homologous chromosomes are pulled to opposite poles and chromatids stay joined to each otherEntangled sections of DNA on non-sister chromatids that became entangled during crossing over break off and rejoin at chiasmata, resulting in formation of recombinant chromatidsScatter graphPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting process

22. Name the photosynthetic pigments found in the antennae complex.

23. Describe the process of photolysis.

Plant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graphFauna - animals of a particular regionPhotolysis: Water molecules split into hydrogen ions, electrons and oxygen molecules using energy from the SunCatalysed by enzyme attached to PSII

24. Define sex linkage.

Sex linkage - when genes are carried on the sex chromosomesPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graphFauna - animals of a particular region

25. Give adaptations that show how an ectotherm regulates its internal temeprature. + state which animals have each

Ectotherm regulation: AdaptationAnimal Basking in sun / moving to shade Lizards Orientating themselves/extending body to make sure maximum/minimum surface area exposed to Sun Locusts and butterfliesPressing body against warm/cool ground Namaqua chameleon Using exothermic metabolic reactions Galapagos iguanas contract muscles to increase metabolism Moths and butterflies vibrate wings to warm up muscles before flight Dark colors to absorb more radiation Lizards in colder climates Altering heart rate to change metabolic rate Namaqua chameleonPlant hormones uses: Auxins used in production of seedless fruitEthene used to promote fruit dropping (e.g. in cotton, walnuts and cherries)Cytokinins used to prevent ageing of ripened fruit & products such as lettuceGibberellins used to delay ripening and ageing in fruit, to improve size and shape of fruits and in beer brewing to speed up malting processScatter graphFauna - animals of a particular region

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❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

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All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | What Should We Know?
Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com