Question
Draw a well labelled diagram of xylem.

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What is metameric segmentation?
Explain, how sonic booms are produced?



Calculate the speed of a sound wave whose frequency is 2kHz and wavelength 65cm.
$^{58}_{26}\text{A},\ ^{58}_{28}\text{B}$
$^{79}_{35}\text{X},\ ^{80}_{35}\text{Y}$