﻿84 
  INTRODUCTION 
  TO 
  BOTANY 
  

  

  5. 
  Would 
  you 
  expect 
  to 
  find 
  any 
  kind 
  of 
  compass 
  plants 
  in 
  wood- 
  

   lands? 
  Why? 
  

  

  6. 
  Why 
  do 
  most 
  aquatic 
  flowering 
  plants 
  have 
  leaves 
  that 
  are 
  ex- 
  

   posed 
  to 
  the 
  air, 
  rather 
  than 
  submerged 
  leaves? 
  

  

  7. 
  Why 
  are 
  trees 
  of 
  the 
  moist 
  tropical 
  regions 
  usually 
  evergreen? 
  

  

  8. 
  May 
  a 
  shrub 
  or 
  a 
  tree 
  be 
  deciduous 
  or 
  evergreen, 
  according 
  to 
  

   circumstances? 
  Give 
  examples. 
  

  

  9. 
  If 
  you 
  wanted 
  to 
  make 
  a 
  cactus 
  plant 
  produce 
  leaves, 
  how 
  would 
  

   you 
  treat 
  it? 
  Why? 
  

  

  10. 
  Tf 
  an 
  aquatic 
  plant 
  were 
  transplanted 
  into 
  desert 
  soil, 
  and 
  an 
  

   extreme 
  xerophyte 
  into 
  a 
  shady 
  swamp, 
  what 
  appearances 
  would 
  in 
  

   each 
  case 
  soon 
  show 
  that 
  the 
  plant 
  was 
  dying? 
  

  

  11. 
  What 
  mesophytes 
  do 
  you 
  know 
  that 
  can 
  grow 
  under 
  a 
  very 
  wide 
  

   range 
  of 
  conditions 
  as 
  regards 
  light 
  and 
  moisture? 
  Compare, 
  with 
  

   regard 
  to 
  their 
  tolerance 
  of 
  drought, 
  some 
  common 
  plants 
  important 
  in 
  

   agriculture. 
  

  

  