question_answer

  Give reasons for      (i) Meristematic cell have prominent nucleus and dense cytoplasm but they lackvacuole. (ii) Intercellular spaces are absent in sclerenchymatous tissue. (iii) We get crunchy and granular feeling when we chew pear fruit. (iv) Branches of tree moves and bend freely in high wind velocity. (v) It is difficult to pull out husk of coconut.

Answer:

                  (i) Meristematic cells undergoes division and do not stores food.                                         (1) (ii) Because their walls are lignified and form bundles for mechanical function.                   (1) (iii) Due to presence of sclerenchymatous cell (stone cell) or sclereids we get a crunchy feeling when we chew pear fruit.                   (1) (iv) Presence of collenchyma provides flexibility to the branches of tree.               (1)       (v) Husk of coconut is made up of sclerenchymatous fibres which are closely packed.                                                              (1)