Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


In 1948, spectrograph tests indicated that a single pigment was responsible for the photoperiodis. In 1952, tests revealed that germination was stopped when a plant was exposed to far­red light and restarted when exposed to red light. In 1959, the team performed conclusive tests on turnip seeds and named the pigment phytochrome. 

Photoperiod is the duration of sunlight received by any place.It affects the natural vegetation of any place. The photoperiod is different at different places because of the variations in latitude, altitude, season and duration of the day
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts