STD 11 - 4. Animal kingdom — BIOLOGY STD 11 Science — Question

 $\begin{array}{|p{0.3\linewidth}|l|} \hline Column-I   & Column-II  \\ \hline 1.\,\,Exoskeleton  & p.\;Thorax  \\ \hline 2.\,\,Three\,\,ganglion  & q.\;Chitin  \\ \hline 3.\,\,One\,\,pair\,\,of\,\,seminal\,\,vesicle & r.\;6^{th}-7^{th}\,\,segments\;\;of\;\;abdomen \\ \hline 4.\,\,Mushroom\,\,shaped  & s.\;6^{th}\,\,segments  \\ \hline \end{array}$

(i) First rise of saline = $10 \,ml$

(ii) Second rise of saline after adding $KOH = 30 \,ml$

$I$. $ECG$ is of a great clinical significance

$II$. Electrocardiograph is the recording of electrical changes in cardiac muscles during the cardiac cycle

$III$. To obtain a standard $ECG$, a patient is connected to the machine with $3$ electrical electrodes (one to each wrist and to the left ankle)

$IV$. Normal activities of the heart are regulated intrinsically

$V$. Electrocardiogram is the electrical activity of heart

The option with correct statements is