Which family includes plants that are mostly used for producing economically important fibers?

The floral formula of mustard (or Brassicaceae/Cruciferae) is:

Which of the following are characteristic features of the $Solanaceae$ family?
$(a)$ Flowers are bisexual and actinomorphic
$(b)$ Calyx have five sepals and are united
$(c)$ Androecium have five stamens and are epipetalous
$(d)$ Ovary is inferior
Choose the correct answer from the options given below:

Which of the following characters are related to the Asteraceae family?
$(a)$ Inflorescence racemose head or capitulum
$(b)$ Fruit with hairy pappus
$(c)$ Placentation marginal
$(d)$ Ovary superior

Which family possesses a perianth?

Which of the following is the correct floral formula of Liliaceae?