B.O.D (Biological Oxygen Demand): It shows the deficiency of oxygen in the water. Pollution in water due to presence of organic biodegradable waste causes increase in number of microbes. These microbes consumes maximum dissolved oxygen. This results in deficiency of dissolved oxygen for higher organisms.Increased BOD is an indicator of water pollution. Daphnia is the … Read more
Medieval India History by Romila Thapar : National Council of Educational Research and Training publishes Medieval India History by Romila Thapar for Class 6 under the guidance of CBSE. Students who are clear with the content that is present in Medieval Indian History Old NCERT Books can easily secure good marks in the examination. In this page … Read more
Open Circulatory System and Closed Circulatory System There are two types of circulatory system: 1. Open Circulatory System 2. Closed Circulatory System. Here we have discussed difference between open circulatory system and closed circulatory system. Almost all multicellular organisms need a circulatory system to transport oxygen and nutrients through the body. Evolution has led to … Read more
Carbon monoxide binds with Hemoglobin about 230 times more readily than oxygen. When a person inhales carbon monoxide, it diffuses from the alveolar air to the blood and binds to Hemoglobin forming carboxyhaemoglobin. The latter is a relatively stable compound and cannot bind with oxygen molecules. So, the amount of Hemoglobin available for oxygen transport … Read more
Multiple choice questions and answers (MCQs) on “Sampling” focus on all areas of Statistics covering various topics. These topics are chosen from a collection of the most authoritative and best reference books on Sampling . Q1 Sample is a subset of: (a) Population(b) Data(c) Set(d) Distribution 1 A Q2 Any population constant is called a: … Read more