Question

Which of the following is a bisexual animal?
A. Snail
B. Starfish
C. Earthworm
D. All of the above

Answer 1

Hint: Bisexual animals are those that have both sex organs present within a single person. Even the gametes they produce are related to the male and female sexes. Bisexual animals or hermaphrodites are distinct from unisexual animals in that they contain both male and female sex organs in a single human.

Complete answer: Bisexual beings, also referred to as hermaphrodites, are creatures with reproductive organs typically associated with both male and female sexes in the same organism. Most invertebrates and a smaller number of vertebrates are hermaphrodites. Examples of Hermaphrodites are as follows:

a) Snails: Most of the snails are hermaphrodites. Some freshwater and marine animals, such as apple snails and periwinkle snails, are the only exceptions.
b) Starfish: The (starfish) Echinoderms are marine invertebrates. That include various echinoderms like sea stars, sea cucumbers, sea urchins and sand dollars. Some of the most common echinoderms are also hermaphrodites.
c) Worms: Another class of invertebrates, i.e. worms contribute to the spread of hermaphroditism. Some worms fertilise themselves, but most of the worms need a mate to reproduce.
d) Fishes: Around 21 fish families are natural hermaphrodites. These rare hermaphrodite vertebrates include snook, clownfish, wrasse, angelfish, grouper, goby, parrotfish, sea bass, starfish and anthia.
Hence, the correct answer is option D.
Note: Bisexual or perfect flowers have both male (androecium) and female (gynoecium) reproductive structures, including stamens and an ovary. Flowers that possess both androecium and gynoecium are called hermaphrodites.