Tag: nucleus
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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…
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Class 9th – STRUCTURE OF ATOM (Subatomic Particles)
We have already discussed in the chapter of atoms and molecules, how atoms are made and how molecules are made. In this chapter we will study in detail about the structure of Atom. An atom is made up of 3 sub-atomic particles; Protons. Electrons. Neutrons. PROTONS The discovery of proton was done by E. Goldstein.…
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Entamoeba histolytica
(Anaerobic parasite) Causes Amoebic dysentery or Amoebiasis. Distribution: Worldwide. Habits & Habitat: Found in large intestine (colon) of man, in both mucosal & sub-mucosal layers of it. It feeds on tissue and RBCs mainly. Secrete a toxic substance to dissolve mucous lining of the intestine. It gradually recedes deep in the mucosal & sub-mucosal…
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Class 9th – Nervous tissue
The nervous tissue comprises of brain, spinal cord and nerves. Structural and functional unit of nervous system is NEURON. Cells of nervous tissue are highly specialized for stimulation. It is responsible for coordinating and controlling. NEURONS A neuron consists of cell body, nucleus within the cell body and cytoplasm. The long part of neuron is…
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Class – 9th : Connective Tissue – Blood
FLUID MATRIX: PLASMA FUNCTIONS OF BLOOD: Blood flows and transports: Gases Digested food Hormones Waste materials to different parts of the body. Blood carries oxygen as oxyhaemoglobin with the help of RBC.