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1 markGrowth

CSEC Biology · January 2007 · Paper 2 · Question 1(d)(ii)

Another method of determining plant growth is using dry mass (weight).

State ONE step to be taken to ensure the accuracy of the results when using this method.

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Other parts of this question

  1. 1(a)(i)On the grid provided in Figure 1, draw a graph of the results shown in Table 1.[7 marks]
  2. 1(a)(ii)Using information from the graph you constructed on page 2, estimate the height of the corn plant on Days 5 and 13.[2 marks]
  3. 1(b)Describe the pattern of growth shown by the plant over the 36-day period.[3 marks]
  4. 1(c)(i)What is the likely source of food for the corn plant during the first 6 days?[1 mark]
  5. 1(c)(ii)Give TWO uses of the food obtained by the corn plant during the first 6 days.[2 marks]
  6. 1(d)(i)Describe the method for obtaining dry mass, including the materials and apparatus necessary.[2 marks]
  7. 1(d)(iii)Give ONE disadvantage of using dry mass to determine growth.[1 mark]
  8. 1(e)(i)Suggest TWO ways in which the growth of the corn plant would be different over the 36 days, if the soil in which it grew were deficient in nitrogen and…[2 marks]
  9. 1(e)(ii)Explain how a lack of EACH of the following elements may result in the differences suggested in (e)(i) above: Nitrogen; Magnesium.[2 marks]
  10. 1(f)(i)The corn seed germinated after a heavy shower of rain, although it had been in the soil for a long period of time. What changes occurred in the seed for…[3 marks]
  11. 1(f)(ii)Apart from water, state TWO conditions necessary for germination.[2 marks]

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