Notes and Study material for Exams
THEORIES OF EVOLUTION Evolution, simply put, is descent with modification. This definition encompasses small-scale evolution (changes in gene frequency in a Population from one generation to the next) and large-scale evolution (the descent of different species from a common ancestor over many generations). Evolution helps us to understand the history of life. Evolution is not … Read more
BIOMOLECULES There is vast diversity of living organisms. The chemical compositon and metabolic reactions of the organisms appear to be similar. The composition of living Tissues and non-living matter also appear to be similar in qualitative analysis.Closer analysis reveals that the relative abundance of carbon, hydrogen and Oxygen is higher in living system. All forms … Read more
Each organism is different from other organisms. The total number of species living on the planet is imprecisely known and published estimates vary from 12 million to over 100 million. This is because there are large numbers of species yet undiscovered and undescribed, and there is not always agreement on whether certain organisms should … Read more
ADifferent agro-climatic zones of Jharkhand, rain fall pattern and known abiotic stresses in each zone. Three Agro-Climatic zones of Jharkhand are: Western Plateau Zone Central and North Eastern Plateau Zone South Eastern Plateau Zone Agro-Climatic Zone of Jharkhand Region Name Districts Name Western Plateau Zone Bokaro Latehar Lohardanga Gumla Hazaribagh Palamau Ranchi Simdega Chatara … Read more
The living world Objects having characteristics of cellular organization, Growth, Reproduction, ability to sense Environment and give response are living organisms. There are some important features of living organisms: It should grow, which means its structure changes as time goes by in an advantageous manner. It should show adaptation to the environment. It should maintain … Read more
FOOD CHAIN- A food chain starts with producers and ends with top carnivores. The sequence of eaten and being eaten, produces transfer of food energy and it is known as food chain. Grazing food chain-The consumers which start the food chain, utilising the plant or plant part as their food, constitute the grazing food chain. … Read more
Eco-System-An ecosystem is defined as a structural and functional unit of Biosphere consisting of community of living beings and the physical Environment, both interacting and exchanging materials between them. It includes Plants, trees, animals, fish, birds, micro-organisms, water, Soil, and people. When an ecosystem is healthy (i.e. sustainable) it means that all the Elements live … Read more
Objects having characteristics of cellular organization, Growth, Reproduction, ability to sense Environment and give response are living organisms. There are some important features of living organisms: It should grow, which means its structure changes as time goes by in an advantageous manner. It should show adaptation to the environment. It should maintain some balanced … Read more
DNA: STRUCTURE DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the … Read more
Biotechnology through Genetic engineering has made Food Crops more resistant to disease, but the mere act of modification of the naturally selected food crops may actually disturb the delicate balance of Fermentation (C) Tissue Culture (D) Cloning Which of the following is an example of a genetically modified organism? (A) A tomato that is resistant … Read more