Tick the most appropriate answer.

1.  Root hair are found in the outermost layer of root called
   1.  dermis
   2.  epidermis
   3.  cortex
   4.  parenchyma
2.  Water is absorbed by the root hair through
   1.  osmosis
   2.  active transport
   3.  transpiration
   4.  ascent of sap
3.  The fluid containing salts, minerals and water enclosed in a cell vacuole is called
   1.  cytoplasm
   2.  nucleoplasm
   3.  sap
   4.  tonoplast
4.  The process by which molecules from a higher concentration move towards lower concentration is called
   1.  osmosis
   2.  active transport
   3.  diffusion
   4.  blending
5.  The pressure developed in roots due to the continuous inflow of water which pushes the sap upwards is 
   1.  root pressure
   2.  sap pressuer
   3.  transpiration pull
   4.  stem pressure
6.  In phloem the direction in which translocation of food takes place is
   1.  downwards
   2.  upwards
   3.  a and b
   4.  none of these
7.  The loss of water vapour through the stomata of the leaves is called
   1.  wilting
   2.  translocation
   3.  transpiration
   4.  transportation
8.  Transpiration occurs through openings in leaves called
   1.  pores
   2.  guard cells
   3.  stomata
   4.  pneumatophores

Fill in the blanks

1.  ________________ are multicellular, thin-walled outgrowths of roots.
2.  Roots absorb minerals by _________________.
3.  The upwards movement of sap through the xylem is called _______________.
4.  There is direct relationship between absorption and _________________.
5.  Water in xylem moves only in the ____________________ direction.

Define transpiration pull.

Define osmosis.