Phytochrome is a -
- Flavoprotein
- Glycoprotein
- Lipoprotein
- Chromoprotein
The Correct Option is D
Solution and Explanation
Answer: Option 4 - Chromoprotein
Explanation:
Phytochrome is a chromoprotein, which is a class of proteins that contain a chromophore (a light-absorbing molecule). It plays a crucial role in plant photoreception, specifically in sensing light to regulate various physiological processes like seed germination, flowering, and circadian rhythms. Phytochrome absorbs light primarily in the red and far-red regions of the spectrum.
Here’s why the other options are incorrect:
Option 1: Flavoprotein
Flavoproteins are proteins that contain a flavin group, such as FMN or FAD, which are involved in redox reactions. Phytochrome, however, does not belong to this category as it involves a different chromophore.
Option 2: Glycoprotein
Glycoproteins are proteins that have carbohydrate groups attached to them. Phytochrome is not categorized as a glycoprotein; its function involves light absorption and not carbohydrate interaction.
Option 3: Lipoprotein
Lipoproteins are proteins that are associated with lipids and typically function in lipid transport. Phytochrome does not have a lipid component but instead is involved in light perception.
Conclusion:
Phytochrome is a chromoprotein, which contains a light-sensitive chromophore (a pigment that absorbs light), making Option 4 the correct answer.
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Concepts Used:
Plant Growth and Development
Growth in Plants:
Plants have the distinctive ability to grow throughout their life. The meristem cells present there in the roots and shoot apical lead to the primary growth of the plant. The primary growth which happens or takes place at the tips of the stem and roots of the plant contributes to the elongation of the plant along its axis.
In the later stages of growth in plants, the growth in dicotyledonous, vascular cambium, gymnosperms, and cork-cambium are also caused by the existence of meristems in them. These intercalary meristems are put up to increase the girth of the organs of the plant in which they are active. Such type of growth is commonly known as secondary growth.
Many parameters such as area, volume, fresh weight, cell number, dry weight, length, etc are utilized to measure the growth in plants as increase in the amount of protoplasm is responsible for the growth in plants.
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