Year: 2020
-
Cell Cycle & Cell Division – Mitosis
Key points: Chromosomes are cellular structures. They carry genes & are composed of DNA, RNA & proteins. Haploid Eukaryotic Cell contains one copy of each chromosome. Diploid Eukaryotic Cell contains two copies of each chromosome. Prokaryotic Cell divide by fission. Eukaryotic Cell divide by Mitosis & Cytokinesis. Most gametes are formed by Meiosis. ‘Cell Cycle’…
-
Prokaryotic & Eukaryotic Cells
Living World is classified into 3 division or domains, namely: 1) Bacteria (Eubacteria) 2) Archaea (Archae-bacteria) 3) Eukaryotes Bacteria & Archaea are grouped separately under Prokaryotes. Since, Viruses lack metabolic apparatus & considered non-living outside host cell, they are classified separately from the above divisions. Examples: Bacteria – Escherichia coli, Lactobacillus, Mycoplasma, Cyanobacteria etc. Archaea…
-
Potency
Definition: Ability of a particular stem cell to generate various differentiated cell types. Stem cells have ability of self renewal. In mammals, 1) Totipotent Stem Cells: Capable of forming every cell in the embryo. Also, capable of forming trophoblast cells of placenta. Example: Zygote & first 4-8 blastomeres. 2) Pluripotent Stem Cells: Capable of forming…
-
FORCE AND PRESSURE
Force is a push or a pull on an object. It changes or tends to change the state of rest or the state of motion of an object by a push or pull. It cannot be seen, but its effect can be seen or felt. It is caused by an interaction. An interaction of one…
-
WHAT IS PSYCHOLOGY?
Before getting to know what Psychology is we should understand first what psychology is not. Psychology is a science and not based on common sense and age hold wisdom. Psychology is not about to predict what others are thinking. After reading psychology we are not only dealing with differently abled person, it is a vast…
-
Memory Consolidation and Hippocampus
We have three types of memories: Sensory Memory Short term Memory Long term Memory. CONSOLIDATION Long term memory stores in our brain from days to years and this process is referred to as consolidation. In simple language, Consolidation means gathering something and in terms of psychology Consolidation means gathering the data or the information. With…
-
SERICULTURE
The rearing of silk worm for commercial purpose is called Sericulture. It is SILK FARMING. Silk Moth belongs to Family: Bombycidae Order: Lepidoptera LIFE CYCLE OF SILK MOTH The life cycle is complete and consist of 4 stages Egg Larva Pupa Adult. The eggs hatch to form larvae. The larvae of silk moth are called…
-
Larva and it’s Types
Larva It has been defined as an intermediate stage in the life history of Invertebrates and few lower chordates. In class Insecta, larva signifies the reproductively immature stage which is determined for feeding and gathering energy for transformation into adult. Class Insecta is a diverse category among the animal kingdom. Many of them vary in…
-
BHOPAL GAS TRAGEDY (NEET)
On the night of 2nd and 3rd December 1948 an incident took place. It is one of the world worst Industrial disaster. A gas named methyl isocyanate (MIC). Over 50,000 people died in this Catastrophic incident. Methyl Isocyanate (MIC) Methyl Isocyanate is a colourless liquid used for making pesticides. The chemical is very reactive. Methyl…
-
STRUCTURE OF ATOM (ISOTOPES) – NEET
ISOTOPES The atoms which have same atomic number but different mass number is called isotopes. The atoms which have same number of protons but different number of neutrons is called Isotopes. structure of atom subatomic-particles EXAMPLE An oxygen contains 8 Protons, so the Atomic number of Oxygen is 8 and mass number is 16 (refer…