Continuity and Change D.4 Cell & Nuclear Division (id: 9da4bc182)

本题目来源于试卷: Continuity and Change D.4 Cell & Nuclear Division，类别为 IB生物学

[问答题]
The mitotic index is an indy -ue8ji hg,3(9bv tcoirect way 58cdf6z/y x5 i; hq xuij5ibd9of measuring plant growth. A study was conducted onhc i yxdizu;xi 5b55jqf9 68d/ white onions (Allium cepa), under controlled conditions in a lab, to investigate the effect of soil pH on the mitotic index of the roots.


1.Describe the trends shown in the graph.

2.Outline how the mitotic index is calculated.

3.Discuss whether the data support the hypothesis that onion plants should be grown in soil with a pH of 5.5.

4.Suggest how a pH of 9 affects the process of mitosis.

5.1.Explain why measuring the mitotic index in the root is an indirect way of measuring the overall growth rate of the onion plant.

5.2.Suggest another method, apart from measuring mitotic index, that could be used to measure plant growth.

6.State one of the variables that must be controlled to make this experiment valid.

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