Which of the following helps in the repair of tissue and fills up the space inside the organ?

Explain the basic characteristics for the classification of permanent tissues in plants.

State whether the following statement is true or false:
The muscles of the heart show rhythmic contraction and relaxation throughout life.

Name the animal tissue which acts as a heat insulator.

Write two basic structural differences between parenchyma and collenchyma tissues.

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.