Question

Which of the following is not a drupe?
A. Plum
B. Trapa
C. Cherry
D. Peach

Answer 1

Hint: Drupe is a simple fleshy fruit which has a single seed. Each fruit has a single, large starchy seed. The fruit is a nut with four barbed spines.

Complete answer:
Option A: Plum is a drupe.Therefore, this is the incorrect option.
Option B: Trapa is a nut, not a drupe. This is the correct answer.
Drupe is an indehiscent fruit which is also known as stone fruit. A seed with a single shell of hardened endocarp is surrounded by an outer fleshy part-exocarp. A hard lignified part called a pit is present on them which is derived from the wall of the ovary of the flower. Drupes usually develop from a single carpel and mostly from flowers with superior ovaries. In an aggregate fruit, each single fruit is called a druplet. Such fruits are often named as berries. Some examples of drupe are: mango, coffee, olive, most palms. A fruit having structure of a drupe, but doesn’t fit the definition of drupe precisely is known as drupaceous.The sweet, fleshy outer layer of drupe attracts animals for food and through this means they disperse their seed.
Trapa plants are annual aquatic plants and they float just beneath the water surface.They have ornately shaped fruits. Each fruit has a single, large starchy seed. The fruit is a nut with four barbed spines.
Option C: Cherry is a drupe.Therefore, this is the incorrect option.
Option D: Peach is a drupe.Therefore, this is the incorrect option.

Hence, the correct answer is option (B)

Note: 1.The coconut is also a drupe with their mesocarp being dry and fibrous (husk)
2.Certain drupes occur in large clusters, for example dates.