﻿FOODS 
  IN 
  PLANTS 
  55 
  

  

  9. 
  Can 
  you 
  arrange 
  an 
  apparatus 
  to 
  test 
  the 
  pressure 
  with 
  which 
  

   maple 
  sap 
  flows 
  from 
  a 
  cut 
  branch 
  ? 
  

  

  10. 
  Can 
  you 
  explain 
  the 
  fact 
  that 
  you 
  cannot 
  get 
  seed 
  from 
  beets 
  

   and 
  carrots 
  the 
  same 
  year 
  that 
  the 
  plants 
  are 
  grown 
  from 
  the 
  seed 
  ? 
  

  

  11. 
  It 
  is 
  often 
  stated 
  that 
  one 
  difference 
  between 
  plants 
  and 
  animals 
  

   is 
  that 
  plants 
  use 
  carbon 
  dioxide 
  and 
  throw 
  off 
  oxygen, 
  and 
  animals 
  use 
  

   oxygen 
  and 
  throw 
  off 
  carbon 
  dioxide. 
  In 
  what 
  ways 
  is 
  this 
  statement 
  

   correct 
  and 
  in 
  what 
  ways 
  is 
  it 
  an 
  error 
  ? 
  

  

  12. 
  In 
  what 
  sense 
  is 
  it 
  true 
  that 
  the 
  sun 
  is 
  the 
  source 
  of 
  the 
  energy 
  

   by 
  means 
  of 
  which 
  plants 
  and 
  animals 
  do 
  their 
  work 
  ? 
  

  

  13. 
  In 
  what 
  ways 
  is 
  it 
  important 
  to 
  your 
  community 
  that 
  the 
  people 
  

   should 
  know 
  something 
  about 
  photosynthesis 
  ? 
  

  

  