Reproduction in Organisms Test - 3

Budding is a form of asexual reproduction which is also seen in multi-cellular organisms like hydra.

Pycnidia spores are released through a small opening at the apex, the ostiole.

Heterokont are biflagellate zoospores with both whiplash and tinsel-type flagella attached anteriorly or laterally. These zoospores are characteristic of Oomycota.

Slips are buds on tuberous adventitious roots which produce shoot above the ground and adventitious roots below and thus, produce a new plant. These are found in Tapioca.

In sperm of mice, centrioles are absent.

Metacystic trophozoite is the motile, feeding and pathogenic stage of E. histolytica. It is a stage in amoeba life cycle in which the nucleus of amoeba undergoes division to form 8 nuclei which is followed by the cytoplasm fission. As a result, 8 small amoebas or amoebulae are formed. These are known as metacystic trophozoites.

Hormogonia method of vegetative reproduction is found in blue-green algae. The trichomes of blue-green algae break up within the sheath into many-celled segments called hormogo­nia or hormogones.

The hypothalamus controls seasonal breeding in animals. It is considered to be the central control for reproduction due to its role in hormone regulation. It produces gonadotropin-releasing hormone which stimulates other glands to carry out reproductive process.

Anestrus refers to the phase when the sexual cycle rests.

In Guinea pigs, haemoendothelial placenta is present with 2 barriers between mother's blood and foetal blood. The chronic villi lose their epithelial and mesenchymal layers and the endothelial lining of the blood vessels is the only barrier.