What is the physical basis of Phototropic response?

What is the physical basis of Phototropic response?

What is the physical basis of the phototropic response? Cell elongation.

How is the structure of a phytochrome related to its function?

Structure. Phytochromes consist of a protein, covalently linked to a light-sensing bilin chromophore. Together, these subunits form the phytochrome region, which regulates physiological changes in plants to changes in red and far red light conditions.

What is PR and PFR?

Phytochromes have two photo-interconvertible forms: Pr and Pfr. Pr absorbs red light (~667 nm) and is immediately converted to Pfr. Pfr absorbs far-red light (~730 nm) and is quickly converted back to Pr.

What is phytochrome and why is it important?

Phytochrome regulates the expression of many plant genes, and it may control plant development primarily through its role in regulating gene expression. As presented earlier, light regulates the synthesis of RUBISCO, the chlorophyll a/b-binding protein, and many other chloroplast proteins.

Which of the following is correct about phytochrome?

The correct option is: (b) Pr absorbs red light and becomes Pfr. Explanation: Phytochrome is an amorphous photoreceptor chromoprotein. It exists in two interconvertible forms i.e., Pr and Pfr.

What is the active form of phytochrome?

The active form of phytochrome (Pfr) can directly activate other molecules in the cytoplasm, or it can be trafficked to the nucleus, where it directly activates or represses specific gene expression.

Which of the following statements about phytochrome is true?

The correct option is: b Pr absorbs red light and becomes Pfr. Explanation:Phytochrome is an amorphous photoreceptor chromoprotein. It exists in two interconvertible forms i.e. Pr and Pfr.

What patterns do Auxins change?

Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism. Auxin also plays a role in maintaining apical dominance.