(a) Name the plants in which the guard cells of stomata are dumb-bell shaped.
(b) What are the constituents of stomatal apparatus ?
(c) What is the function of trichomes in the shoot system?

Which type of plants show guard cells that are dumb-bell shaped?

In which group of plants the guard cells are dumb - bell shaped?

What is the shape of guard cells in dicot plants?

Which metal is a constituent of green colouring matter in plants ? What is the name of this matter ?

(a) Which blood cell in man becomes smaller or maturity? (b) What is the function of basophil cell?

(a) Name the various organs of the human excrtory system (b) Draw a neat labelled diagram of the human excretory system (c) What is the function of excretory system in humans ?

Brassica campestris Linn (a) Give the common name of the plant. (b) What do the first two parts of the name denote? (c) Why are they written in italics? (d) What is the meaning of Linn written at the end of the name?