How many facets are present in a parenchyma cell
$20$
$14$
$10$
$7$
Contractile tissues have the following features
$(i)$ Mesodermal in origin
$(ii)$ They contain stretch receptors.
$(iii)$ Rhythmic contractions are seen in them
$(iv)$ They do not fatigue during the life of the animal
Which of the above are characteristics of sphincters?
Two cross-sections of stem and root appear simple, when viewed by naked eye. But under microscope, they can be differentiated by
Vascular bundles having xylem and phloem sit at the same radius is termed as
Which of the following have sunken stomata?