|   auxins | 31. Most plant hormones act as promoters of one response or another. Which type of hormone is unusual in that it generally acts as a growth inhibitor? |  abscisic acid
 gibberellins
 cytokinins
 | 
  
    |   early humans watching what plants were eaten by wild animals | Question 32.32. The first human medicines from plants probably resulted from _____. |  experiments by chemists in 1800\'s
 chemical analysis of commonly grown plants
 trial and error studies in the 1700\'s
 | 
  
    |   True | Question 33.33. Plants resemble humans in that they also produce hormones for growth and development and cell differentiation. |  False
 | 
  
    |   sensing sunrise and sunset | Question 34.34. What is the function that phytochrome is known to perform in the photoperiod-related control of flowering? |  inducing flowers to form
 none of the choices are correct
 determining night length
 | 
  
    |   True | Question 35.35. Plant circadian rhythms (biological clocks) are regulated by thigmotropsim. |  False
 | 
  
       |     auxins  | 31. Most plant hormones act as promoters of  one response or another. Which type of hormone is unusual in that  it generally acts as a growth inhibitor? |  abscisic acid
 gibberellins
 cytokinins
 | 
    
Q31. abscisic acid
 The top two plant growth inhibitors are: (1) Abscisic Acid and (2) Ethylene.
 Q32. early humans watching what plants were eaten by wild animals
 Q33. True
 Plants produce hormones for growth and development and cell differentiation. Auxins and cytokinins are examples