Question

Right ovary is rudimentary in
A. Shark
B. Birds
C. Sphenodon
D. Calotes

Answer 1

Hint: Ovary is a ductless reproductive gland which is found in the female reproductive system. It produces an ovum or egg which are known as the female gametes.

Complete answer:
Option A: Shark belongs to the class Chondrichthyes. They live in water and use their gills to filter oxygen from the water. The reproductive system of female sharks consists basically of a pair of ovaries and oviducts. Therefore, this is an incorrect option.

Option B: In the Majority of the birds, the right ovary does not mature after hatching and remains rudimentary throughout their life. However, the left ovary matures with age and soon becomes the only functional ovary in the bird. As a result, only the left oviduct is functional. Therefore, this is an incorrect option.

Option C: Sphenodon belongs to the class reptilia. The reproductive system consists basically of a pair of ovaries and oviducts. It is often called a 'living fossil'. The ovaries of reptiles are paired, hollow, oval (or, in snakes, elongate) structures attached to the dorsal body wall by a mesovarium. Therefore, this is an incorrect option.

Option D: Calotes is a genus of lizards. The ovaries of reptiles are paired, hollow, oval (or, in snakes, elongate) structures attached to the dorsal body wall by a mesovarium. Therefore, this is an incorrect option.

Hence the correct answer is option B. Birds.

Note: The various adaptations of birds which help them to fly are,
- They have feathers which help them in flying.
- They have only left the ovary thereby decreasing their body weight.
- Instead of heavy jaws and teeth, birds have beaks.
- They have light and streamlined bodies which help them to fly.