Question

Disc florets of sunflower are
A. Zygomorphic and epigynous
B. Zygomorphic and hypogynous
C. Actinomorphic and epigynous
D. Actinomorphic and hypogynous

Answer 1

Hint:The inflorescence of flowers belonging to the family asteraceae is called floret. It is seen in helianthus annus (sunflower).

Complete answer:
The floret is located in the center of head, bracteate, actinomorphic, bisexual, tubular, pentamerous. In disc florets, the calyx is absent or pepcase and corolla consist of five petals, gamopetalous and tubular. The androecium of disc florets consists five stamens, epipetalous, syngenesious, filaments free. And the gynoecium is bicarpellary, syncarpous, unilocular, inferior ovary, basal placentation and bifid stigma.

The sunflower is grown commercially as an ornamental plant. Floral color and inflorescence type are important traits in the breeding of ornamental sunflowers. Sunflowers consist of disc florets. The color of the disc florets depends on the presence or absence of anthocyanin pigmentation. Anthocyanin pigmentation was dominant over yellow and lemon yellow, showing monohybrid inheritance with a segregation ratio of $3:1$ in the ${f_2}$ generation. The interaction of the genes revealed new combinations of floral color and type, which can increase variability in ornamental sunflowers. The disc florets possess both the male and female characteristic.

Therefore, from the above explanation, the correct option is (C) actinomorphic and epigynous.

Note:Remember, disc florets that anthocyanin pigmentation usually give different shades of yellow. Sunflowers produce nutrient-dense seeds, an excellent source of beneficial fats, protein, vitamins and minerals. Salted, dry-roasted sunflower seeds, rich in the antioxidants vitamin E, are eaten as part of a healthy diet.