NEET Practice Questions (MCQs) with Answers & Solutions

The NCERT text states: 'Bohr model, though offering a satisfactory model for explaining the spectra of the hydrogen atom, could not explain the spectra of multi-electron atoms.' The inability to extend to multi-electron atoms suggests a failure to account for complex electron-electron interactions, which are absent in single-electron systems like hydrogen.

Vasa efferentia are 10-12 in number that arise from testes, not kidneys. They enter the kidneys on their side and open into Bidder’s canal.

The urinogenital duct that comes out of the kidneys opens into the cloaca. The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior.

A mature female can lay 2500 to 3000 ova at a time.

Fertilisation is external and takes place in water.

Male reproductive organs consist of a pair of yellowish ovoid testes, which are found adhered to the upper part of kidneys by a double fold of peritoneum called mesorchium.

The ovaries are situated near kidneys and there is no functional connection with kidneys. A pair of oviduct arising from the ovaries opens into the cloaca separately.

The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior. Bile is secreted by the liver.

Development involves a larval stage called tadpole. Tadpole undergoes metamorphosis to form the adult.

Two ureters emerge from the kidneys in the male frogs. The ureters act as urinogenital duct which opens into the cloaca.