1. What is true of blue light receptors (choose all that are true) Plants growin

Q: 1. What is true of blue light receptors (choose all that are true) Plants growin

1 2) 4) Small seeds need frequent light exposure to germinate because quality light activates the phytochrome system which helps the seeds to germinate by absorbing Pfr and pr light . seed germination is initaited .The Pr phytochrome absorbs red light and converted to Pfr.when Pfr absorbs Far red light it is converted to Pr.This is called photoconversion.

ID: 257571 • Letter: 1

Question

1. What is true of blue light receptors (choose all that are true)

Plants growing toward directional light is primarily a response to blue light

Blue light can trigger stomata to open faster and larger than red light alone

Blue light is involved in the photo-reversibility of germination in lettuce seeds

Blue light triggers chloroplast movements when light intensity becomes strong

They are activated by blue Dwavelengths and inactivated by UV wavelengths

Phototropin blue light receptor shuttles in and out of the nucleus

2. What are two ways that activated phytochrome can participate in signal transduction (. Hint: explain why some responses are ‘fast’ and others ‘slow’).

3. Explain how WUSHEL and CLAVATA establish a feedback loop to maintain the size of the stem cell niche in the shoot apical meristem

4. Why do small seeds frequently need exposure to light to germinate? What happens if a burst of red light is quickly followed by a burst of far red light?