Question

Water-soluble yellowish pigments present in petals of Dahlia is
(a)Carotene
(b)Xanthophyll
(c)Anthoxanthin
(d)Anthocyanin

Answer 1

Certain pigments are essential for plants to carry out their life processes. Some of these pigments are insoluble in water whereas others are water-soluble. They are of different colours depending on their use and pH.

Complete answer:
Anthoxanthin is the pigment present in petals of Dahlia. These are flavonoids water-soluble pigments that are colourless, creamy or yellow in colour. These are the pigments that contribute cauliflower, onion, white potatoes and turnips their cream or white colour.

Additional Information: Pigments are coloured substances and used in the colouring of other materials. Plants and animals contain many kinds of organic pigments. Especially plants need the chlorophyll pigment to carry out photosynthesis. Other essential pigments include Anthocyanin, betalains, carotenoids etc.
Let us know more about the other pigments in the question:
-Carotene: It is orange or red pigments which are crystalline in nature. They are mainly found in the chromoplasts and also in a few plant-eating animals.
-Xanthophyll: These are oxygen-containing yellow pigments that are responsible for giving colour to flowers, fruits and vegetables, eggshells, shells and features. Some vegetables that contain Xanthophyll are corn, pepper etc.
-Anthocyanin: These are water-soluble too. Depending on the pH they can be red, blue or purple in colour. Some fruits that contain Anthocyanin are blueberry, raspberry etc.
So, the correct answer is anthoxanthin.

Note: Anthocyanin and Anthoxanthin both are water-soluble in nature. Anthoxanthin is creamy or yellowish in colour whereas Anthocyanin, depending on pH, is found in red, blue and purple colour. anthoxanthin also has a special characteristic. it shows white colour in acidic medium and yellow in an alkaline one.