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Chapter 23: Problem 60

Red light converts phytochrome red (Pr) to __. a. an inactive form of Pr b. a breakdown product c. the far red light absorbing form called Pfr d. cryptochrome

Short Answer

Expert verified
c. the far red light absorbing form called Pfr

Step by step solution

01

Understand the Context

Phytochromes are a type of photoreceptor in plants that detect light and play a crucial role in regulating plant development. Phytochrome red (Pr) and phytochrome far-red (Pfr) are two interconvertible forms of phytochrome.
02

Role of Red Light

Red light is absorbed by the Pr form of phytochrome. When Pr absorbs red light, it gets converted to its active form, known as phytochrome far-red (Pfr).
03

Identify the Correct Answer

Based on the understanding of how red light affects phytochrome: Pr converts into Pfr when exposed to red light. This corresponds to option (c) from the given choices.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

phytochromes
Phytochromes are essential plant photoreceptors that help plants sense and respond to light. These proteins regulate various aspects of plant growth and development, including seed germination, stem elongation, and flowering. Phytochromes are unique because they exist in two forms - Phytochrome red (Pr) and Phytochrome far-red (Pfr). These forms are interconvertible, meaning one can transform into the other when exposed to specific light wavelengths. This conversion is crucial for plant's ability to adapt to their environment and optimize their growth.
plant photoreceptors
Plants use photoreceptors to detect light, which are specialized proteins sensitive to different wavelengths. Phytochromes are a type of plant photoreceptor specifically responsive to red and far-red light. Apart from phytochromes, plants have other photoreceptors like cryptochromes and phototropins that detect blue light. Plant photoreceptors play a pivotal role in directing plant behaviour, ensuring plants grow correctly by detecting changes in light quality and intensity, which then trigger a cascade of developmental processes.
red light absorption
Red light is an essential component of the light spectrum for plant development. It is specifically absorbed by Phytochrome red (Pr). When Pr absorbs red light, it undergoes a structural change to convert into the active form, Phytochrome far-red (Pfr). This transformation is vital because Pfr is the form that can trigger growth and developmental processes in plants. By measuring red light absorption, plants can gauge their environment, like the density of surrounding plants or the duration of daylight, and adjust their growth accordingly.
Pfr conversion
The conversion of Phytochrome red (Pr) to Phytochrome far-red (Pfr) is a key aspect of plant photoreception. When Pr absorbs red light, it switches to Pfr, which is considered the biologically active form. Pfr can revert to Pr when exposed to far-red light, ensuring plants have a dynamic way to respond to changing light conditions. This reversible conversion allows plants to fine-tune their growth processes, such as opening leaves under red light or elongating stems in shade conditions, ensuring the plant thrives in varying light environments.

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