[Campbell Biology P.905] Which of the following statements accurately differentiates between... | Practice Question
Which of the following statements accurately differentiates between cryptochromes and phytochromes based on the provided text?
A: Cryptochromes absorb red and far-red light to regulate seed germination, while phytochromes are involved in blue-light-induced stem elongation.
B: Phytochromes absorb mostly red and far-red light and regulate responses like seed germination and shade avoidance, whereas cryptochromes detect blue light and are involved in processes like stem elongation inhibition.
C: Both cryptochromes and phytochromes primarily absorb blue light, but cryptochromes mediate stomatal opening, while phytochromes regulate chloroplast movements.
D: Cryptochromes are protein kinases that control phototropic curvatures, while phytochromes are DNA repair enzymes that regulate de-etiolation.
Explanation
The text states that 'Phytochromes, pigments that absorb mostly red and far-red light, regulate many plant responses to light, including seed germination and shade avoidance.' It also mentions 'Cryptochromes, molecular relatives of DNA repair enzymes, are involved in the blue-light-induced inhibition of stem elongation'. This accurately matches option B.