MODEL PAPER 1 — BIOLOGY STD 11 Science — Question

$I$. $ECG$ 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

$(i)$ Glycocalyx is the outermost envelope in bacteria.

$(ii)$ The glycocalyx could be a loose sheath called capsule.

$(iii)$ The glycocalyx may be thick and tough called slime layer.

$(iv)$ A special structure formed by the plasma membrane is called mesosome.

$(v)$ Small bristle like fibres sprouting out of the cell are called fimbriae.