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Polyphyletic Theory - Metazoa
This theory was suggested by Greenheig (1959) and some other workers. According to this theory, sponges, coelenterates, ctenophores and flatworms have each evolved independently from protozoans. Sponges and coelenterates have probably arisen through colonial flagellates, while ctenophores and flatworms through ciliates or even mesozoans.
It is apparent that this theory is a compromise between the Syncytial and colonial theory.
Evolution of heart in higher animals The circulatory system in higher animals has undergone several changes during evolution. The heart has become totally muscular. Th
Captive Breeding - Measures for Species Conservation Species which are reduced to dangerous levels need more intensive management, and one strategy is their captive breeding.
characterstics and classification of vertebrates
What is digestion? The ingested food material is broken down into smaller constituents which are assimilable by the blood. The process through which the major nutr
Q. Why is the plant life cycle known as alternation of generations? The plant life cycle is called as alternation of generations because in this cycle there are two different f
Blockage of ducts In some bulls there is a blockage of the transport of sperm through the epidydimis usually caused by a congenital non-patency of some part of the vasa effere
Stage 1 sleep: As an individual becomes drowsy, and enters stage 1, alpha wave decreases and theta waves appear. Theta waves with a frequency of about 6 to 8 cycles per second are
Locomotion,nutrition and reproduction in ptotozoa
what is the opposite of yield? A.grow B.attack C.ask D.answer
The cytoskeleton is a network of very little tubules and filaments spread throughout the cytoplasm of eukaryotic cells. It is made of microtubules, microfilaments and intermediate
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