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What is the contraceptive mechanism of the IUD?
The IUD (intrauterine device) is a piece of plastic coated with copper that is inserted within the uterus by a doctor. Copper is then steadily released (IUD may last 5 to 10 years) and as it has a spermicidal action sperm cells are destroyed before fecundation. Besides this mechanism the movement of the IUD inside the uterus causes slight endometrial inflammation that helps to stop nidation.
Q Which is the chordate class considered an evidence of the transition of the vertebrates from the aquatic to the dry land environment? The amphibians are totally aquatic in th
Q. What do you mean by Echinodermata? You will recall that Pliylum Echinodermata includes spiny skinned animals which are exclusively marine (Gr, echinus : spiny; derma: ski
Cost of Accidents Immediate Cost Immediate cost takes into account the loss of work, damages to equipment and facilities which have to repaired and restored or replaced
Ecosystem Control Another important aspect of ecosystem functioning that is how it maintains its ecological balance. By now, it must be obvious to you that an ecosystem is a d
DIVISION PHASE OR MITOSIS (M- PHASE) Cell division was first observed by Naegeli 1842 in plant cells ,but thoroughly described by Eduard strasburger 1875. Fleming 1879 desc
How does true motility differ from brownian movement? What morphological structre is responsible for bacteria motility? Why is the wet preparation discarded in disinfectant s
Hydrogen ( H) has 1 electron, carbond ( c) has 6 electrons ; oxygen ( O) has electrons, Nitrogen ( n) HAS 7 electrons. Use the octet rule to determine which of the following is mos
Explain the term Direct Calorimetry? Calorimetry refers to the measurement of the amount of heat evolved or absorbed in a chemical reaction, change of state, or formation of a
Theca - body form Protozoans It is a close-fitting hard structure around the plasma membrane, mainly composed of cellulose. It can be compared with the ceil wall of a plant ce
diagram of dna replication
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