STD 12 - 2. human reproduction — NEET STD 11 Science — Question

Which of the following is/are included in Cnidarians?

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 ?

Assertion : Cocaine has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy.

Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.

Oxygenated blood is carried by

Active immunity may be acquired by

Statement I: Multipolar neurons are found in the cerebral cortex.
Statement II: Unipolar neurons are found in the retina of eye.

Cyclostomata belongs to which division?

Echinoderms and chordates have

Assertion: In females, oxytocin responsible for child birth and milk ejection from the mammary gland.
Reason: Oxytocin act on the smooth muscles and stimulates their contraction.