If an etiolated stem could be first saturated with auxin by spraying and then exposed to a streak of light from one side it will

In dicot stem cork cambium first derived from-

Who isolated the first naturally occurring auxin from human urine?

Auxin was first isolated from

Auxins were first isolated from

Auxins were first isolated from

In an experiment, Pooja used a equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. She placed a screen on the other side and saw many colours appearing as patches on the screen. But when she used a red light source, she could only see a red patch on the screen. Similarly she used a blue and green light source and could only see one colour patch on both occasions. The phenomenon that she was trying to demonstrate was:

In an experiment, Pooja used a equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. She placed a screen on the other side and saw many colours appearing as patches on the screen. But when she used a red light source, she could only see a red patch on the screen. Similarly she used a blue and green light source and could only see one colour patch on both occasions. She also could relate to another natural phenomenon that we observe on a rainy humid day as the sun comes out. What could be that phenomenon?