STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

The contrast to Annelids the Platyhelminths show

The rupture of the graafian follicle and the release of ovum occurs under the influence of

Where the saddle joints are presents in humans?

A survey of animal kingdom presents a variety of excretory structures. In most of the invertebrates, these structures are simple tubular forms whereas vertebrates have complex tubular organs called kidneys. Some of these structures are mentioned here.
(i) Protonephridia or flame cells are the excretory structures in Platyhelminthes.
(ii) Planaria and amphioxus have protonephridia is a excretory structures.
(iii) Nephridia are the tubular excretory structures of earthworms and other annelids.
(iv) Nephridia help to remove nitrogenous wastes and maintain a fluid and ionic balance.
(v) Malpighian tubules are the excretory structures of most of the insects and molluscs including cockroaches.
(vi) Antennal glands or green glands perform the excretory function crustaceans like prawns.
Which of the following statements are correct ?

Choose incorrect statement for haemophilia.

Choanocytes are present in

Gastrulation is the process which involves the differentiation of the following layers in a vertebrate embryo

In which era mammals and birds evolved