MCQ
The P-wave in ECG is generated:
- AAt the beginning of ventricular contraction
- BAt the beginning of atrial relaxation
- ✓At the end of atrial relaxation
- DNone of the above
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$(i)$ Excretion is performed by malphigian tubules.
$(ii)$ They absorb nitrogenous waste products and convert them into uric acid which is excreted out through hindgut.
$(iii)$ In addition, fat body, nephrocytes and urecose glands also help in excretion.
$R -$ Plasma membrane of a cell is selectively permeable.