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Light is an important factor for plant growth and development. There are several photoreceptors in higher plants such as Arabidopsis thaliana involved in the perception of various wavelengths of light. Some statements are given below related to photoreceptors:
P. Red light photoreceptors are represented by a gene family.
Q. Phytochrome C is the most prominent photoreceptor to perceive red light.
R. Cryptochrome 1 and Cryptochrome 2 have evolved from bacterial DNA photolyases.
S. Far-red light is perceived by phytochrome D.
Which one of the following combinations of the above statements is correct?
P and Q
Q and R
Rand S
P and R
Answers (1)
Phytochrome B (phyB) is the primary photoreceptor for perceiving red light in plants, while phytochrome C (phyC) has specific functions but is expressed at lower levels. Far-red light is primarily perceived by phytochrome A (phyA), not phytochrome D (phyD). PhyB plays a crucial role in various light-mediated responses, while phyC is involved in regulating specific developmental processes. PhyA undergoes a conformational change upon absorbing far-red light, triggering physiological and developmental responses. PhyD has other roles related to light perception and plant development. Therefore, statement Q is wrong, and statement S is wrong. Hence, the correct answer is option 4.
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