The chemical present in the walls of bark of the tree which makes them impervious to gases and water is

Name the two types of complex tissues.

Voluntary muscles are found in

Name the region of the plant where meristematic tissues are usually found. Give the position and function of various types of meristematic tissue.

Fill in the blanks:
$(a)$ ............. are forms of complex tissue.
$(b)$ .............. have guard cells.
$(c)$ Cells of cork contain a chemical called .............
$(d)$ Husk of coconut is made of ............. tissue.
$(e)$ ............ gives flexibility in plants.
$(f)$ ............... and ............... are both conducting tissues.
$(g)$ Xylem transports ............... and ............... from soil.
$(h)$ Phloem transports ............... from ............... to other parts of the plant.

Give reasons for:
$(a)$ Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuoles.
$(b)$ Intercellular spaces are absent in sclerenchymatous tissues.
$(c)$ We get a crunchy and granular feeling when we chew pear fruit.
$(d)$ Branches of a tree move and bend freely in high wind velocity.
$(e)$ It is difficult to pull out the husk of a coconut.