Revision 2 Section C questions

  1. In an experiment a group of female locust were provided with excess amounts of food from

the day they moulted to adult stage upto the 20th day of adulthood.  The average fresh weight of each locust was also calculated every second day.  It was also noted that they all laid eggs between day 12 and day 14 and again between day 18 and 20 of adult life.

Data on  average dry weight of faeces and weight of each locust every two days is presented in the table below. 

Days of adult life 2 4 6 8 10 12 14 16 18 20
 

Average dry weight of faeces (mg)

 

250

 

420

 

610

 

740

 

850

 

630

 

540

 

830

 

750

 

620

Average weight of locust (mg) 530 750 840 970 1020 1160 860 980 1120 820

 

(a) on the graph paper, plot histograms to show the average dry weight of faeces produced by each locust every 2 days

(b) What is the relationship between food consumption and body weight?  Explain your answer

(c) What is the relationship between egg production and food consumption?  Explain your answer

  1. d) Explain the relationship between egg production and body weight
  2. e) State two possible consequences that may happen if the amount of food was reduced to one half of that required by each locust throughout the study period

(f) From the data state two nutrients that must be present in the locust diet.  Give a reason in each case.

  1. Describe how breathing takes place in mammalian lungs.
  2. (a) Define the term transpiration

(b) Explain the factors that affect the rate of transpiration in plants

 

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