



Match the LIST-I with LIST-II. \[ \begin{array}{|l|l|} \hline \textbf{LIST I} & \textbf{LIST II} \\ \hline A. \ \text{Franklin Stahl} & I. \ \beta\text{-form of DNA} \\ B. \ \text{Maurice Wilkins} & II. \ \text{Estimated absolute amount of each Base} \\ C. \ \text{Erwin Chargaff} & III. \ \text{Proposed two polynucleotide chain} \\ D. \ \text{Watson and Crick} & IV. \ \text{Individual strands of Duplexes are entirely heavy or light} \\ \hline \end{array} \]

A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?