Biology - Maynooth University

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Bitheolaíocht, Roinn C – Ardleibhéal 
Leaving Certificate Examination 2020
2020. M44 
Section C  2   
Section C Answer any four questions.
 
10.  (a)  (i)  Why is it necessary for an organism to possess an adaptation to its habitat?           (ii)  Name two types of adaptation that an organism can exhibit.   (9) 
   (b)  Gunnera (Gunnera tinctoria), known as giant rhubarb is 
a ornamental plant native to Chile. It has umbrellalike  leaf blades up to two metres high and great numbers of  tiny flowers. 
   This huge plant has been recorded at 1,168 locations on  Achill Island and creeps invasively along cliffs,  streamsides, roadsides and damp meadows, shading  out native vegetation and building up huge seed banks which crowd out everything  else.    Gunnera spreads largely by its creeping surface rhizomes (horizontal stems) and the  scatter of plant fragments, rather than by birds eating the seeds.   Eradication schemes by county councils have proved difficult, as fresh leaves sprout  from rhizomes that have been partially poisoned with glyphosate herbicide and the  layered seed banks wait their turn to take over.   Gunnera is one of the few flowering plants to fix its own nitrogen through hosting a  toxic cyanobacteria in its cells. The plant’s need for water, humidity and frostfree  winters has kept it largely to the west coast of Ireland and its hinterland.  (Adapted from ‘Gunning for Gunnera: ornamental wonder or ecological menace?’, The Irish Times, 15th 
March, 2013.)   
   (i)  Give two methods by which Gunnera outcompetes native Irish plants.       (ii)  What method is usually used to control the population of Gunnera?    (iii)  Suggest one reason why Gunnera is so successful at growing in poor quality soil. 
(iv)  Biological control, using herbivores, might not be successful at controlling the  population of Gunnera. Suggest one reason why. 
  (v)  Suggest two ways how Gunnera may invade and colonise new areas.    (vi)  Name two abiotic factors that have limited the spread of Gunnera in Ireland.         (27)  (c)  (i)  State one reason why ecological surveying is important.     (ii)  Organisms’ roles in energy transfer in an ecosystem can be represented using        different methods. 
1. Name the ecosystem you studied.  2. Draw a food chain from this named ecosystem containing four members 
(trophic levels).  3. Why are food chains mostly limited to four or five members?  4. Draw a pyramid of numbers to represent this food chain.   5. Indicate on your pyramid of numbers, the position of 
   
  3   
11.  (a)  (i)  Name the type of nutrition exhibited by organisms that carry out photosynthesis.     (ii)  Write a balanced chemical equation to summarise photosynthesis. 
(9)    (b)  The diagram is that of a transverse section (T.S.) of a leaf growing in a sunny area.                                  (i)  What is the role of the stomata in photosynthesis?    (ii)  Which of the labelled part (A, B or C) would you expect to contain the most 
chloroplasts?    (iii)  Chloroplasts contain chlorophyll molecules.  What is the role of the chlorophyll 
molecules in photosynthesis?    (iv)  What particles are released from chlorophyll during the light dependent stage of 
photosynthesis.    (v)  These particles enter one of two pathways.      Give an account of the events of pathway 2. 
(27)    (c)  Answer the following questions in relation to the second stage of aerobic respiration.   
(i) Name the 3carbon molecule which enters the mitochondrion.  (ii) Name the two carbon containing molecules produced when the 3carbon 
molecule at (i) above is broken down.  (iii) One of these carbon containing molecules formed at (ii) above enters a series of     reactions.  Name this series of reactions. 
               
  4   
12.  (a)  (i)    What is meant by the term heredity?                 (ii)  State Mendel’s Law of Independent Assortment (2nd Law). 
 (9)      (b)  The series of images below represents the four main stages of the DNA profiling 
technique invented by Sir Alec Jeffreys in 1984.   
   
  (i) Distinguish between DNA profiling and genetic screening.      (ii) Explain each of the Stages, 1 to 4, of DNA profiling shown above.  (iii)  Give any two applications of DNA profiling.      (iv)  Identical twins have the same DNA profile. Explain why this is so. 
(27)   
  (c)  In Andalusian chickens the allele for black feathers (B) exhibits incomplete dominance 
 
(i) Explain the terms underlined in the passage above.   
(ii) Determine all the possible genotypes and phenotypes of the offspring of a    cross between the following chickens:   
“blue” rooster  X  “blue” hen        Include in your answer the ratio of the resulting phenotypes.   
(iii)  What would be the effect on the offspring phenotype ratio, in the genetic cross    at (ii) above, if there was no incomplete dominance between the two alleles for    feather colour, and if black feather was the dominant trait and white feather was    the recessive trait? 
       (24)             
1 2 3 4
  5   
13.  (a)   (i)  Explain what is meant by the term homeostasis.       (ii)  Give one reason why homeostasis is important in organisms.      (iii)  Explain what is meant by the term excretion.       (9)    (b)  Urine produced by the kidney contains water, salts and urea.      (i)  State the precise location in the body  
  where urea is made.  (ii)  Name the food biomolecule from which     urea is derived.   (iii)  A diagram of a human kidney is shown on     the right.  
    1.  In which part of the kidney is the        Bowman’s capsule located?      2.  In which part of the kidney is         the Loop of Henle located?      3.  Name the part labelled ‘A’.   
   
Collecting duct  Distal convoluted tubule  Glomerulus 
 
Urea  0.03  0.03  1.8 
Glucose  0.1  0.1  0 
Proteins  7  0  0 
      (i)  Using the data from the table above, what is the main difference between the         composition of blood plasma and glomerular filtrate? Explain why this is so.         (ii)  Using the data from the table above, in relation to glucose, explain the findings        in the composition of the fluids between: 
        1.  Blood plasma and glomerular filtrate.        2.  Glomerular filtrate and urine. 
    (iii)  Using your knowledge of homeostasis and excretion:      1.  State the effect on the volume of urine produced by a high salt intake.      2.  Explain your answer to part 1. 
  (24) 
  6   
    
 
 
 
 
 
 
 
        (i)  What is the role of the menstrual cycle?      (ii)  Name the event that occurs between days 15 of the cycle.      (iii)  The event you have named at (ii) is triggered by a large drop in a certain         hormone. Name the hormone.      (iv)  Where is the hormone oestrogen produced?      (v)  Using the time axis from the graph above, sketch a graph in your answer book, to         indicate the changes in oestrogen levels during the cycle.      (vi)  Name the event that occurs at day 14 and name the hormone which causes this         to happen.       (vii)  Name the structure that the Graafian follicle develops into after day 14.      (viii)  Does the graph indicate that the woman became pregnant during this menstrual         cycle? Explain your answer.    
  (b)  Answer the following questions from your knowledge of sexual reproduction in  flowering plants. 
   (i)  Describe in detail:       1.  The development of the pollen grain from a microspore mother cell.       2.  The events that happen to a mature pollen grain following pollination up to         double fertilisation.      (ii)  Give two adaptations of windpollinated flowers that increase their chance of 
successful pollination. 
     
  7   
 
(i)  Draw a large labelled diagram of a typical bacterial cell.  
(ii)  Name the method of asexual reproduction exhibited by bacteria.  
(iii)  Describe the process of this asexual reproduction in bacteria. 
(iv)  The diagram below is that of a typical growth curve for microorganisms; 
1.  Name each of the stages of the growth curve labelled A, B and C. 
2.  What is a suitable label for axis Y? 
 
 
 
 
 
 
      
   
 
 
    (v)  Copy the growth curve in your answer book and indicate on your diagram         when endospore formation is most likely to occur.                                        
Time (hours) 
  8   
  
(a) Plants produce chemicals called growth regulators such as auxin to regulate tropisms.     (i) What is a tropism? 
(ii) Where precisely in plants are auxins produced? 
(iii) What is the precise benefit to the plant that the shoot is positively phototropic? 
(iv) Give two uses in agriculture or horticulture of plant growth regulators. 
(v) The graph below shows the result of a student’s investigation on the effect of  different concentrations of IAA on the growth of plant roots and shoots.  
               
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(–) 
(+) 
  9   
  (b)  Human papilloma virus (HPV) is a virus that can infect cells and cause some cancers in  
    males and females.  A vaccine has been produced to prevent infection by the human  
    papilloma virus and is now available to all first year students attending Irish second 
    level schools.  The vaccine contains particles from the coat of the virus only, in a saline  
    solution, and stimulates induced immunity in humans.    
      (i)  From which biochemical component are viral coats made? 
    (ii)  Name the other main chemical component of a virus.  
(iii) Why can viruses be described as obligate parasites? 
(iv) Describe how virus particles can infect and replicate in host cells.   
    (v)  Immunity is the ability to resist infection. Name the two types of induced 
immunity. 
    (vi)  Which of these types of immunity that you have named at (v), occurs after a 
   vaccination with the HPV vaccine?  
(vii)  Give one difference between the types of induced immunity that you have 
   named at (v). 
      (c)  Answer the following questions about a plant root.   
    (i)  Draw a diagram of the longitudal section (L.S.) of a typical root. 
    (ii)  Label any three zones on your diagram.  
    (iii)  In which zone is water absorbed from the soil? 
    (iv)  Name the process through which water is absorbed from the soil.  
    (v)  Name the tissue that transports water in roots. 
    (vi)  Give two ways in which this tissue is adapted to transporting water.  
    (vii)  Two Irish scientists, Dixon and Joly, first proposed the theory of water movement 
      in plants.  Using this theory, describe the mechanism by which water moves 
      through this tissue to the leaves in a plant. 
           
  10   
 
  11   
 
Section C 
 
   
Copyright notice This examination paper may contain text or images for which the State Examinations Commission is not the copyright  owner, and which may have been adapted, for the purposes of assessment, without the authors’ prior consent.  This  examination paper has been prepared in accordance with Section 53(5) of the Copyright and Related Rights Act, 2000.   Any subsequent use for a purpose other than the intended purpose is not authorised.  The Commission does not accept  liability for any infringement of thirdparty rights arising from unauthorised distribution or use of this  examination paper. 
Do not hand this question paper up  
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<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> /ENU (Stephen Austin Distiller settings file V6) >> >> setdistillerparams << /HWResolution [2400 2400] /PageSize [612.000 822.047] >> setpagedevice