Question

Chromatophores take part in

• A. photosynthesis
• B. growth
• C. movement
• D. respiration

Hint:

Associate "chroma" with color or pigment. In bacteria, chromatophores are specialized structures for photosynthesis. In animals, they are pigment cells for color change.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks about the primary function of chromatophores in biological systems.

Step 3: Detailed Explanation:
* Chromatophores: These are pigment-containing cells or organelles found in various organisms. In photosynthetic bacteria (e.g., purple bacteria), chromatophores are membrane-bound vesicles or invaginations of the cell membrane that contain photosynthetic pigments (like bacteriochlorophylls) and enzymes. They are the sites where photosynthesis occurs in these bacteria.
* In animals (e.g., cephalopods, fish, amphibians, reptiles), chromatophores are pigment cells that allow rapid color change for camouflage or signaling. However, in the context of general biology, particularly related to microorganisms, their role in photosynthesis is key.
* Options (b), (c), and (d) describe general cellular processes, but photosynthesis is the specific function associated with chromatophores in photosynthetic organisms.

Step 4: Final Answer:
Chromatophores take part in photosynthesis.

Answer 2

Breaking down the word "chromatophore" itself, along with what it refers to in different organisms, clarifies which function it is tied to.

1. Photosynthesis: In photosynthetic bacteria such as purple sulfur and purple non-sulfur bacteria, chromatophores are specialised membrane-bound structures formed by folding of the cell membrane, and they house the pigments (like bacteriochlorophyll) and the light-harvesting complexes and reaction centres needed to capture light energy and convert it into chemical energy. This makes them the actual site of photosynthesis in these organisms.
2. Growth: Growth in cells is generally driven by processes like cell division and protein synthesis, not by pigment-containing membrane structures, so this option does not describe a chromatophore's role.
3. Movement: Cellular movement typically involves structures like flagella or cilia, or cytoskeletal elements, none of which are what chromatophores are built for.
4. Respiration: While chromatophores in some photosynthetic bacteria can also carry components related to electron transport, their primary and defining role, especially in the biology syllabus context, is capturing light energy for photosynthesis rather than being the main respiratory apparatus.

Breaking the term down to its pigment-bearing, light-capturing role points squarely at photosynthesis as the associated function.

Therefore, the correct answer is photosynthesis.