5 votes 5 votes The growth of bacteria (lactobacillus) in milk leads to curd formation. A minimum bacterial population density of $0.8$ (in suitable units) is needed to form curd. In the graph below, the population density of lactobacillus in $1$ litre of milk is plotted as a function of time, at two different temperatures, $25^{\circ}$C and $37^{\circ}$C. Consider the following statements based on the data shown above: The growth in bacterial population stops earlier at $37^{\circ}$C as compared to $25^{\circ}$C The time taken for curd formation at $25^{\circ}$C is twice the time taken at $37^{\circ}$C Which one of the following options is correct? Only i Only ii Both i and ii Neither i nor ii Quantitative Aptitude gate2017-me-1 general-aptitude quantitative-aptitude data-interpretation graphical-data + – Arjun asked Feb 26, 2017 edited Jun 16, 2019 by Sukanya Das Arjun 2.0k views answer comment Share Follow Migrated from GO Mechanical 4 years ago by Arjun See all 4 Comments See all 4 4 Comments reply Ayush Upadhyaya commented Jan 12, 2018 reply Follow Share I is true as very obvious from the given graph. II is false as the given graph shown only bacterial growth in milk but curd formation in milk may have other factors too like the purity of milk which might affect the speed of curd formation so II is false. So, this way I got ans as (a) and as per key it is correct. Is my analysis for II part correct? 0 votes 0 votes saxena0612 commented Jan 12, 2018 reply Follow Share For $II$ my reasoing is not considering any other factor : At around approx $90$ min at $37^o$ Population density is suitable whereas for $25^o$ its approx $130$ min. Therefore its not twice . 0 votes 0 votes joshi_nitish commented Jan 12, 2018 reply Follow Share @saxena your reasoning is not correct, entire 1 litre milk will not change into curd instantaneously when bacterial population density will reach 0.8, more info is required for it. 1 votes 1 votes saxena0612 commented Jan 12, 2018 reply Follow Share Yes ! Thanks nitish though minimal density is achieved way before at $37$ compared to $25$ but cannot comment on twice time ! Correct thank you ! 0 votes 0 votes Please log in or register to add a comment.
Best answer 9 votes 9 votes The growth in bacterial population stops earlier at $37^∘$C as compared to $25^∘$C - TRUE. From the graph it can be seen that the growth stops after $150$ minutes at $37^∘$C while it stops after $180$ minutes at $25^∘$C The time taken for curd formation at $25^∘$C is twice the time taken at $37^∘$C - FALSE. From the graph it can be seen that curd formation happens in around $90$ minutes at $37^∘$C and in around $120$ minutes at $25^∘$C Correct Option: A. Arjun answered Jun 5, 2019 Arjun comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes Growth of Bacterial population stops when Bacterial population becomes steady. It happens after 140 min at 37∘C& at 180 min at 25∘C 180. it stops earlier at 37∘C Time taken for curd formation is time required to reach density of 0.8. At 37∘C time required ≈≈ 90 min At 25∘C, time required ≈≈ 130 min Hence only statement -1 is true 2 can not be correct according to above explanation so A is answer Ram Swaroop answered Jan 9, 2019 Ram Swaroop comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes According to the given graph, Statement-(i) is correct, The time taken for curd formation in $25^{\circ} = 120$ minutes, the time taken for curd formation in $37^{\circ} C= 80$ minutes, hence (ii) is incorrect. Hence Option A is correct go_editor answered Jun 4, 2019 go_editor comment Share Follow See all 0 reply Please log in or register to add a comment.