NEET Test 58

Half cell reaction taking place at cathode is the reduction reaction. 

Reduction of Zn²⁺ will take place. 

Zn²⁺ + 2e^- →Zn

• Necturus belongs to class Amphibia of superclass 2 tetrapoda of the division Gnathostomata.
• The respiratory organs in class Amphibia are usually lungs, buccopharyngeal cavity, skin, and gills.
• The gills are usually present at least in the larval stage, the exception to this is Necturus which is an adult form and carry gills in addition to the lungs.

• Balanoglossus and Saccoglossus are commonly known as Tongue worm which belongs to phylum Hemichordata.
• They are known as tongue worms because the shape of proboscis (an extensible tubular sucking organ)and collar bears a close resemblance to tongue.
• Roundworms belong to the phylum Aschelminthes e.g., Ascaris.
• Tapeworms belongs to class Cestoda of phylum Platyhelminthes e.g., Taenia solium, Taenia saginata and Echinococcus.
• Blood fluke belongs to the class Trematoda of phylum Platyhelminthes e.g., Fasciola and Schistosoma (blood fluke).

• Cells of inner cell mass get rearranged to form a flat embryonic or germinal disc which further differentiates into two layers an outer epiblast of larger columnar cells and inner hypoblast of smaller cuboidal cells.
• Gastrulation begins with the formation of the primitive streak on the surface of epiblast.
• Epiblast forms mesoderm after the establishment of endoderm while remaining cells of epiblast form ectoderm.
• Therefore, epiblast is the source of all germ layers in the embryo.

• During Spermatogenesis, Follicle stimulating hormone (FSH) acts on Sertoli cells and stimulates secretion of some factors which help in the process of Spermiogenesis.
• Sertoli cells also secrete another protein, hormones called Inhibin, which suppresses Follicle Stimulating hormone (FSH) synthesis.
• So, FSH along with testosterone stimulate the sperm production in the seminiferous tubules.