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Bilateral - Metazoa
Bilaterally symmetrical animals have the major axis running from head (anterior) to tail (posterior). They have a ventral (lower) and dorsal (upper) surface that are different from each other. They have only two sides that look alike, the right and left. The animal can be divided into just two identical halves through a plane which passes from anterior to posterior end. Almost all animals including human beings except for sponges, ctenophores and cnidarians show bilateral symmetry.
Adult echinoderms, though radially symmetrical (pentamerous) have larvae that are bilateral. This is because they have evolved from bilaterally symmetrical ancestors. In general, bilateral animals that adopt a sessile existence commonly exhibit a shift towards radial symmetry. The shift may be slight as in acorn barnacles where only protective circular wall plates are arranged radially or the shift may be profound as in the case of sea stars or starfishes. Bilateral animals are called Bilateria.
Chamaephytes - Classes of Life Form The perennating buds and organs are borne on shoots close to but just above the ground. The buds receive protection from fallen leaves and
PADP may be determined by measuring the end diastolic velocity of PADP = 4 V 2 Pulmonary regurgitant signal and applying the following formula V is the end diastolic veloci
Q. What is the ecological importance of fungi? Fungi are decomposers and heterotrophs they break down dead beings and they actively participate in the recycling of organic mate
Disadvantages of Protozoa
Ideal Characteristics 1) Maximize gas transfer (oxygen, carbon dioxide and anaesthetic gases) 2) Minimize blood trauma 3) Good heat transfer efficiency 4) Minimize
Circulatory Systems in Animals In animals that have efficient circulatory systems and readily permeable vascular skins, gas exchange occurs through the integument. Thus we fin
Photoreceptors Photoreceptors are concerned in absorption of light by photosensitive pigments. The chemical change involved produces the impulse concerned in the nerve cells.
Ecology and genetics as taxonomic units
write about complementary genes
Cation Saturation and Nutrient Absorption by Plants The availability of adsorbed cations is not always so easy as the above explanation might suggest. This is because, several
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