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  INTRODUCTION 
  TO 
  BOTANY 
  

  

  PROBLEMS 
  

  

  1. 
  What 
  is 
  it 
  that 
  often 
  causes 
  suddenly 
  submerged 
  agricultural 
  

   plants 
  to 
  beco 
  yellow 
  and 
  die? 
  

  

  2. 
  What 
  causes 
  the 
  bubbles 
  that 
  arise 
  from 
  the 
  soil 
  when 
  a 
  heavy 
  

   shower 
  is 
  falling'. 
  1 
  ' 
  What 
  causes 
  them 
  to 
  rise? 
  

  

  3. 
  What 
  are 
  the 
  worst 
  plant 
  diseases 
  of 
  your 
  community? 
  What 
  

   has 
  your 
  state 
  done 
  to 
  prevent 
  these 
  diseases? 
  Do 
  people 
  in 
  your 
  com- 
  

   munity 
  follow 
  the 
  directions 
  of 
  your 
  agricultural 
  experiment 
  station 
  

   relative 
  to 
  plant 
  diseases? 
  

  

  4. 
  What 
  is 
  the 
  source 
  of 
  the 
  dust 
  that 
  is 
  deposited 
  on 
  window 
  sills 
  

   during 
  windy 
  weather? 
  

  

  5. 
  Are 
  soils 
  blown 
  away 
  during- 
  windy 
  weather? 
  

  

  6. 
  Why 
  are 
  the 
  brandies 
  of 
  young 
  trees 
  pruned 
  so 
  heavily 
  when 
  

   the 
  trees 
  are 
  transplanted 
  ? 
  Why 
  are 
  they 
  pruned 
  as 
  a 
  means 
  of 
  fruit 
  

   production 
  ? 
  

  

  7. 
  Why 
  do 
  agriculturists 
  ordinarily 
  use 
  low 
  or 
  level 
  lands 
  chiefly 
  for 
  

   cultivation 
  and 
  uplands 
  chiefly 
  for 
  pasturage? 
  

  

  8. 
  What, 
  effect, 
  upon 
  the 
  soil 
  is 
  supposed 
  to 
  be 
  produced 
  by 
  rotation 
  

   of 
  crops? 
  Is 
  rotation 
  advisable 
  for 
  the 
  garden? 
  

  

  