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Q. What is the evolutionary advantage of the occurrence of larval stage and sperm cells in the life cycle of sponges?
The sexual reproduction in sponges in addition to contributing to genetic variability also facilitates the colonization of farther environments by these beings since larvae and sperm cells are mobile and can swim in the external to compensate the immobility of the adult individual.
Problem of Polarity The control of polarity in regenerating coelentrates like hydra has received much attention for many years. You are already aware that while a hydra is cu
What is the radula? What is the function of this organ? Some molluscs have a tongue-like structure with harsh saliences similar to small teeth. This structure is called radula
COMPOSITION OF CELL WALL Cell wall composed of cellulose, hemicellulose, pectin, lignin, cutin & chitin. Cell wall consists of 3 parts - 1. Matrix Highly cross-
Enzyme Activity Enzymes are biomolecules which catalyze (i.e. increase the rates of) chemical reactions. Almost all enzymes are proteins. In enzymatic reactions, the molecules
Write down all the four quantum numbers of the electron in the outermost shell of rubidium (At. no.= 37) atom. a) What type of hybridization is associated with N in NH 3 ? b
Person Z swallowed a large amount of substance X and, as a result, has convulsions (abnormal violent contractions of skeletal muscles). Swallowing which of the following substance
Name the organism included in symbiotic nitrogen fixation. What are the components needed for this pure? Determine their role. Differentiate among inbreeding and heterosis. The
what are the sources of infection (human, animal and non-living reservoirs), the routes of transmission (way in which the infection spreads) and different ways in which micro-organ
What is the plasma membrane of the cell? What are its main functions? The plasma membrane is the outer membrane of the cell; it delimits the cell itself and a cell interior wit
Explain the term Intracellular Filaments? Intracellular Filaments : The cell contains fibrous proteins which serve to give the cell its shape and internal organization and fo
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