Question

Pineapple fruit develops from
(a) A cluster of compactly borne flower on a common axis
(b) A multilocular monocarpellary flower
(c) A unilocular polycarpellary flower
(d) A multi-pistillate syncarpous flower

Answer 1

Hint: The pineapple fruit (ananas) is a sorosis, i.e. a type of multiple fruits. The whole inflorescence turns into a compact fruit.

Complete answer:
Pineapple fruit develops from a cluster of compactly borne flowers on a common axis. It develops from spike, spadix, or catkin. In such cases, the flowers remain with their succulent petals, the axis bearing them grows and becomes fleshy or woody. Additional information:
Types of fruits are:
Simple fruits: These fruits develop from the monocarpellary ovary or multicarpellary syncarpous ovary are called simple fruits. Only one fruit is formed by the gynoecium.
Aggregate fruits: These fruits develop from the multicarpellary apocarpous ovary. It develops as a fruitlet because each carpel is separated from one another within the apocarpous ovary. These fruits make a bunch of fruitlets which are known as etaerio. Eg. Calotropis, strawberry, custard apple.
Composite fruits: All composite fruits are a type of false fruit. In these fruits, generally, there are many ovaries and other floral parts combining to form the fruit. These are of two types: sorosis that develops from spike, spadix, or catkin inflorescence, such as jackfruit fruit, pineapple, etc. and sycosis that develop from hypanthodium inflorescence such as in ficus.
So, the correct answer is “a cluster of compactly borne flower on a common axis”

Note: Fruits help in protecting the seeds inside by hardening of the fruit to make accessing the seeds more difficult, or by the accumulation of acids or other toxins. They also aid in seed dispersal by attracting birds and other animals to eat seeds.