What is the difference between lenticels and stomata ?
lenticles | stomata |
$\Rightarrow$ lenticles are made due to loosening of cortical tissue. | $\Rightarrow$ stomata are specific structure located in epidermis. |
$\Rightarrow$ they are mainly seen in stem. | $\Rightarrow$ mainly they are seen on the lower surface of leaves. |
$\Rightarrow$ lenticles don't have guard cells. | $\Rightarrow$ stomata have guard cells. |
$\Rightarrow$ these pores are not regulated. it works for removal of waste material. | $\Rightarrow$ the opening and closing of stomata is regulated. it is associated with gaseous exchange and removal of extra water and waste mateiral. |
Sclerenchyma usually_______ and ________ protoplasts.
What part of the plant would show the following :
$(a)$ Radial vascular bundle
$(b)$ Polyarch xylem
$(c)$ Well developed pith
What is a secondary meristem ? One which originates from
Match the following
Column$-I$ | Column$-II$ |
$(a)$. Hypodermis in dicot stem | $(i)$ Absent |
$(b)$. Pericycle in dicot stem | $(ii)$ Parenchymatous |
$(c)$. Ground tissue in monocot stem | $(iii)$ Collenchymatous |
$(d)$. Phloem parenchyma in monocot stem | $(iv)$ Sclerenchymatous |
Assertion : In angiosperms, the conduction of water is more efficient because their xylem has vessels.
Reason : Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria