MCQ
Secondary growth is absent in
- ADicot stem
- BGymnosperms
- ✓Monocot stem
- DDicot root
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$X-Y$
$(i)$ is released by sympathetic fibers
$(ii)$ is released by parasympathetic fibers
$(iii)$ increases the heart rate
$(iv)$ decreases blood pressure.
Which of the above statements are correct ?
$I.$ Muscle fibre is lined by the plasma membrane called sarcolemma
$II.$ Cytoplasm of the muscle fibre is called tonoplasm
$III.$ Sarcolemma of the muscle fibre encloses the sarcoplasm
$IV.$ Muscle fibre is syncitium
Select the correct option