Quelpr
2 marksFood and Nutrition

CSEC Integrated Science · 2009 · Paper 2 · Question 1(e)(i)

Reproduction of the unicellular organism occurred in a flask containing water and glucose. Over three weeks, the population increased then decreased.

Suggest two likely reasons for the decrease in the population of organisms.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)Name each of the structures labelled A, B, C and D.[2 marks]
  2. 1(b)Outline two differences between the flowering plant and the reproducing unicellular organism shown in the figures.[2 marks]
  3. 1(c)(i)Identify in Figure 1 two structures that are associated with sexual reproduction.[2 marks]
  4. 1(c)(ii)Identify in Figure 1 one structure that is associated with asexual reproduction.[1 mark]
  5. 1(d)(i)Which of the labelled parts of the flowering plant should the farmer use?[1 mark]
  6. 1(d)(ii)Give a reason for your choice of plant part in (d)(i).[1 mark]
  7. 1(d)(iii)State one advantage and one disadvantage of cultivating genetically identical trees.[2 marks]
  8. 1(e)(ii)What is the likely effect on the population of the organisms if the temperature of the flask is raised to 80 °C?[1 mark]
  9. 1(e)(iii)Give one reason for your answer in (e)(ii).[1 mark]

More practice: the rest of this paper · more Food and Nutrition questions · all CSEC Integrated Science past papers