Question

Homologous organs are
A) Tail of bird, monkey and scorpion
B) Stings of honey bee, scorpion and fangs of snake
C) Wings of butterfly, flying fish and bird
D) Paddle of whale, front legs of horse and arms of humans, legs of duck, hind limbs of pig, hind limbs of kangaroo

Answer 1

Hint:A homologous structure is an associate organ, framework, or piece that shares a typical heritage in varied creatures and few instances are the arm of a person's, the wing of a flying creature or a bat, the leg of a puppy and in addition, the flipper of a dolphin or whale are homologous structures.

Complete answer:
Monkeys, cats, rats and different mammals have tails. In mammals, the tail is an extension of the trunk, made from versatile vertebrae. Tails primarily perform to push back insects, however, they'll additionally function as sources of balance for a lot of reserved species, like cats.

Humans possess an identical feature called the coccyx, or tailbone. Additionally, an associate extension of the trunk, it's made from what some scientists decide is “rudimentary vertebrae” and is assumed to possess once been a fully-formed tail. in contrast to different vertebrate tails, however, it presently serves no purpose.

The fact that the structure of the human as therefore closely resembles that of associate animal tail offers scientists reason to link it to a standard antecedent between mammals and humans. because of this link, the class tail and also the human as square measure homologous structures.

Coccyx – The “tailbone” at the tip of a mammal’s vertebral column. The as could also be composed of amalgamated vertebrae, or it's going to extend into a tail.
Photoreceptor – A structure, typically a cell or tiny organ, that detects any light-weight that falls on that.
Cervical vertebrae – The bones that offer support for the higher spine.

Hence the correct answer is option ‘D’ i.e, Paddle of whale, front legs of horse and arms of humans, legs of duck, hind limbs of pig, hind limbs of kangaroo.

Note:Homologous structures share an analogous embryonic origin; analogous organs have an analogous performance. For instance, the bones within the front flipper of a whale area unit homologous to the bones within the human arm. These structures don't seem to be analogous. The wings of a butterfly and also the wings of a bird are unit analogous but not homologous.