1. What do you mean by meiosis? Ans. Meiosis is a special type of cell division involving a diminution (meion in Greek means reduction or diminution) in the amount of genetic material which comprises two successive nuclear divisions with only one round of DNA replication, which produces four haploid daughter cells from an initial diploid [...]
It is the most powerful weather event on the earth, disrupting weather pattern across half of the earth’s surface. The most recent El Nino began to develop in 1989 and lingering until 1995. It resulted in unusual weather and short term climate changes that caused losses in crops and commercial fishing.
1. What are corals? Ans. Corals are the anthozoan polyps of Phylum Cnidaria, which are capable of secreting calcareous materials or a horny organic material that form a hard external or internal skeleton. 2. What is Corralite and Corralum? Ans. The skeleton formed by a solitary polyp is called Corralite, while the skeleton of entire [...]
Chemical oxygen demand (COD) is a measure of the ability of chemical reactions to oxidise matter in aqueous system. The results are expressed in terms of oxygen so that they can be compared directly to the results of biochemical oxygen demand (BOD) testing. The test is performed by adding the oxidising solution to a sample, [...]
The BOD test is an indirect measure of the biodegradable organic matter in an aqueous sample. The test is indirect because oxygen used by microbes as they degrade organic matter is measured. Generally the test is performed over a 5 day period (BOD5) of 20°C in 300 ml bottles incubated in the dark to prevent [...]
