Question

Cypsela is characteristic fruit of
a. Compositae
b. Gramineae
c. Cruciferae
d. Malvaceae

Answer 1

Hint:
The fruit develops from bicarpellary, syncarpous, inferior ovary with single basal ovule. The fruit has a crown of hair-like projections known as pappus.

Complete answer:
In order to answer this question we need to know about family Asteraceae.
Asteraceae or compositae is commonly referred to as the sunflower family. It is a widespread family of flowering plants which has over 32,000 species.
Nearly all members of Asteraceae are perennial herbs. Asteraceae is an economically important family, providing products such as cooking oils, leafy vegetables, sunflower seeds, sweetening agents, coffee substitutes and herbal teas. Asteraceae are important in herbal medicine also.
Cypsela is a characteristic fruit of the family Asteraceae. It is dry single-seeded fruit formed from a double ovary of which only one develops into a seed.
 Malvaceae is a family of flowering plants that has 4225 known species. It includes okra, cotton, cacao and durian. Fruit is schizocarpic carcerulus or capsule.
Cruciferae is a family of flowering plants commonly known as mustards, crucifers, or cabbage family. The family contains 4,060 accepted species.
Gramineae is a ubiquitous family of monocotyledonous flowering plants that has cereal grasses, bamboos also.
The fruit of Malvaceae is a capsule.
The fruit of Cruciferae is siliqua.
The fruit of Gramineae is caryopsis.
Therefore, the correct answer is a, compositae.

Note: Asteraceae are considered weeds in various circumstances. Many among these are invasive species in particular regions introduced by human agency. Examples: Various tumbleweeds, Bidens, ragweeds, thistles, and dandelions.