Articulated laticifers or latex vessels are prominent in
Papaver
Calotropis
Banana
Euphorbia
Protosteles are found in
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?
Histogen theory states that epidermis is derived from the
Periclinal division in a cell takes place by