NEET IT: NEET BIOLOGY 360 FOR SURE

  In higher classes, you will come to know that all living phenomena are due to underlying interactions. Properties of tissues are not present in the constituent cells but arise as a result of Interactions among the constituent cells. Similarly, properties of cellular organelles are not present in the molecular constituents of the organelle but arise as a result of interactions among the molecular components comprising the organelle. These interactions result in emergent properties at a higher level of organisation. This phenomenon is true in the hierarchy of organisational complexity at all levels. Therefore, we can say that living organisms are self-replicating, evolving and self-regulating interactive systems capable of responding to external stimuli. Biology is the story of life on earth. Biology is the story of evolution of living organisms on earth. All living organisms - present, past and future, are linked to one another by the sharing of the common genetic material, but to var

  When it comes to human beings, it is all the more difficult to define the living state. We observe patients lying in coma in hospitals virtually supported by machines which replace heart and lungs. The patient is otherwise brain-dead. The patient has no self-consciousness. Are such patients who never come back to normal life, living or non-living?   If we define coma patient under living category, which of the following will not be a supporting feature to him or her? a. Metabolism b. Self-consciousness c. Cellular organization d. Both a and c b     Which one of the following aspects is an exclusive characteristic of living things? (Mains 2011) (a) Isolated metabolic reactions occur in vitro (b) Increase in mass from inside only (c) Perception of events happening in the environment and their memory (d) Increase in mass by accumulation of ma

  Perhaps, the most obvious and technically complicated feature of all living organisms is this ability to sense their surroundings or environment and respond to these environmental stimuli which could be physical, chemical or biological. We sense our environment through our sense organs. Plants respond to external factors like light, water, temperature, other organisms, pollutants, etc. All organisms, from the prokaryotes to the most complex eukaryotes can sense and respond to environmental cues. Photoperiod affects reproduction in seasonal breeders, both plants and animals. All organisms handle chemicals entering their bodies. All organisms therefore, are 'aware’ of their surroundings. Human being is the only organism who is aware of himself. i.e., has self-consciousness. Consciousness therefore, becomes the defining property of living organisms.   The most obvious and technically complicated feature of all living organisms would be- a. Sensing stimuli

  Another characteristic of life is metabolism. All living organisms are made of chemicals. These chemicals, small and big, belonging to various classes, sizes, functions, etc., are constantly being made and changed into some other biomolecules. These conversions are chemical reactions or metabolic reactions. There are thousands of metabolic reactions occurring simultaneously Inside all living organisms, be they unicellular or multicellular. All plants, animals, fungi and microbes exhibit metabolism. The sum total of all the chemical reactions occurring in our body is metabolism. No non-living object exhibits metabolism. Metabolic reactions can be demonstrated outside the body in cell-free systems. An isolated metabolic reaction(s) outside the body of an organism, performed in a test tube is neither living nor non-living. Hence, while metabolism Is a defining feature of all living organisms without exception. Isolated metabolic reactions in vitro are not living things but surely living