Question

Number of pairs of gill slits in Petromyzon is:
(a)6
(b)7
(c) 8
(d) 9

Herdmania shows :
(a) Progressive Matamorphosis
(b) Retrogressive Metamorphosis
c) induced Metamorphosis
(d) All of the above

During gametogenesis a mammalian female produces .....polar bodies.
(a)1
(b) 2
(c) 3
( 4) 4​

Answer 1

Answer:

.. ..........a c........

Answer 2

5 to 16 pairs of gills, Retrogressive Metamorphosis, and 3 polar bodies.

• Petromyzon is commonly called 'sea lamprey' that belongs to the phylum Chordata.

• The unique feature of this species is its suctorial mouth.

• Hermandia's larva shows retrogressive metamorphosis. In simple terms, the notochord of these animals will be present only in the tail region.

• Gametogenesis in females results in the production of 3 polar bodies. These polar bodies degenerate in the body.