Anthocyanin and anthoxanthin are water soluble pigments of red, yellow or orange colour, depending on pH. These pigments are usually present in the plant vacuoles.

Thus, the correct answer is option D.

Explanation:

Chloroplasts are specialized organelles found in the cells of green plants and algae. They are responsible for the process of photosynthesis, which converts light energy into chemical energy. Chloroplasts contain several pigments, including chlorophyll a, chlorophyll b, carotenes, and xanthophylls, which are involved in capturing light energy.

Chlorophyll a:
Chlorophyll a is the primary pigment found in chloroplasts. It plays a central role in photosynthesis by absorbing light energy and transferring it to other molecules. It absorbs light most efficiently in the blue and red regions of the electromagnetic spectrum.

Chlorophyll b:
Chlorophyll b is an accessory pigment that works in conjunction with chlorophyll a. It absorbs light in the blue and red-orange regions of the spectrum and transfers the energy to chlorophyll a. Chlorophyll b helps to broaden the range of light that can be captured by the chloroplasts.

Carotenes:
Carotenes are orange pigments found in chloroplasts. They are part of a larger group of pigments called carotenoids. Carotenes absorb light primarily in the blue-green region of the spectrum. They act as accessory pigments and help to transfer absorbed energy to chlorophyll a.

Xanthophylls:
Xanthophylls are yellow pigments found in chloroplasts. Like carotenes, they are also part of the carotenoid group of pigments. Xanthophylls absorb light in the blue region of the spectrum. They function as accessory pigments and work alongside chlorophylls to capture light energy.

Anthocyanins:
Anthocyanins are a class of water-soluble pigments that are responsible for the red, purple, and blue colors in many fruits, flowers, and leaves. They are not typically found in chloroplasts and are not involved in the process of photosynthesis. Instead, anthocyanins play a role in attracting pollinators and protecting plant tissues from UV radiation.

Therefore, the correct answer is option 'D' - Anthocyanin.