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BIOLOGY

JAMB 2008 - Question 27

Biology 2008 JAMB Past Questions - Question 27: The part labelled IV indicates that the yeast population has

use the diagram below to answer the questions 26 and 27

The part labelled IV indicates that the yeast population has

A: reached its maximum size

B: reached senescence

C: stopped metabolizing food

D: started dying

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Correct Answer

Explanation

A At this point or stage there is ceasation of growth. The yeast cells no longer increase possibly because the food (glucose) on which the yeast cells feed upon is completely depleted and there is accumulation of alcohol which is toxic to yeast growth. Senescence or old age is a phase of negative growth. This is the period the shallow part of fresh water that has a cells are getting weak and dying