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Q. Type specimen of class enteropneusta?
Examine the specimen and note the following features:1. Balanoglossus has a soft, elongated, worm-like body which has a ciliated surface.2. Body length reaches 10-50 cms and is divided into short conical proboscis, , collar and long trunk.3. Proboscis is cylindrical, tapering and muscular. Near the base is a proboscis pore which is the opening of the coelom (present within the proboscis) to the exterior.4: Collar is a short, cylindrical, muscular band enclosing a pair of coelomic cavities (collar coelom). The collar opens by a pair of collar pores on the dorsal ; surface. The rim of the collar encloses the mouth which is permanently open. ,5. The trunk is superficially ringed and divided into 3 parts (a) anterior branchiogenital part containing genital ridge that carry gonads. This part can , be demarcated from the outside as it has gill-slits but the contents cannot be seen without dissection. (b) hepatic region. (c) the posterior end which is the trunk region.6. The mouth lies at the base of proboscis and is encircled by the edge of the collar.7. In the hepatic region are present double rows of hepatic caeca.8. Alimentary canal is straight and anus is at the end of the trunk. (Sexes are separate and fertilization is external. Development includes a free swimming pelagic larva called tornaria larva.)
In general, which of the following best relates the severity and frequency of natural events, such as storms or droughts? A) Nothing is known about this relationship. B) The severi
Which of these lists contains the four postulates of natural selection? Which of these lists contains the four postulates of natural selection? Uniform population, heritable trait
Each ribosome having of two subunits a small subunit and a large subunit, every of that is a multi component complex of rRNAs (ribosomal RNAs) and ribosomal proteins t
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Define role of Vitamin D in controlling gene expression? Vitamin D is a secosteroid that is metabolically activated and degraded through the actions of three cytochrome P450 hy
Define about the Polyphenols? We now come to a group of compounds, which were until recently considered to adversely influence nutrient absorption or giving colour to foods e.g
FLUI D MOSAIC MODEL Proposed by Nicholson and Singer (1972) Proteins and lipids are arranged in a mosaic fashion. Lipids and proteins are in a semi fluid structure.
whatismicrobiology
What is the difference between water-soluble and fat-soluble vitamins? Why can fat-soluble vitamins cause harm when ingested in excess? Water-soluble vitamins are those soluble
Technique: Careful re-opening of sternum and release of steinum from the underlying adhesion is done. Femoral artery and vein are exposed for going on femoro fenioral bypass
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