Interesting Questions and Answer on Cell – Class 8

Interesting Questions and Answer on Cell – Class 8

  Hi Readers: Today we will discuss some interesting question and answer regarding Cells.  This questions are very important as far as board examinations and competitive examinations are concerned.  Please check out the questions and its answers and please feel free to ask where ever you get stuck.  So let us start with the following:  ...........................   Q1)  Name one single cellular Eukaryotic plant A) Chlamydomonas Q2)  Name one single cellular Eukaryotic plant but in nature it is found as colony A) Volvox Q3)  Name one single cellular Prokaryotic plant A) Bacteria Q4)  Name one single cellular Eukaryotic animal A) Amoeba Q5)  Name one Smallest cell A) Mycoplasma Q6)   Name one largest plant cell A) Sclerenchyma fibre Q7)  Name one largest animal cell A) An ostrich egg Q8)  Name the largest cell in human A) A Nerve cell Q9)  Name a smallest cell in human A) Sperm cell Q10)  Name one plant cell which is devoid of nucleus A) Matured Sieve Tube Q11)  Name one animal cell which is devoid of nucleus A) Matured RBC (exception: blood of camel) Q12) Who first discovered dead cell? A) Robert...
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Structure Function and Location of Animal Tissue

Structure Function and Location of Animal Tissue

Hi viewer: Today we will discuss about animal tissues in a telegraphic language to understand it lucidly.  The explanation of  the topic you will get in our YouTube Channel. So let us start with the structure function and location of animal tissue: ANIMAL TISSUE Epithelial Tissue Characteristic Features In the epithelial tissue, the cells are embedded on the basement membrane. In the epithelial tissue, blood vascular system is absent. It develops from the ectoderm. Cells are closely packed with no intercellular spaces. The cell possesses prominent nucleus granular cytoplasm and no vacuole.   Squamous Epithelial Tissue Cells are arranged like tiles in a mosaic fashion or like scales. Nucleus is prominent. Cells membrane is prominent. Cells are thin, flat and irregular in outline   Location: It is present in the inner walls of the lips, in the inner walls of Alveoli of the Lungs, Bowman’s Capsule of Nephron, inner linings of Blood Vessels, and in the Peritoneum Functions This tissue acts as the covering membrane Hence it gives protection to the...
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Different types of Plant Tissues and their Functions – Class 8

Different types of Plant Tissues and their Functions – Class 8

Hi Viewers: Today we are going to discuss about the different types of Plant Tissues and their Functions.  To remember all the important points in this article we will use the telegraphic language.  PLANTS TISSUE What is a Tissue? Ans.  An organised mass of cells of similar structures , similar origin and similar function.   PLANT TISSUE: A) Meristematic Tissue B) Permanent Tissue: a)  Simple Permanent Tissue: Parenchyma Collenchyma Sclenchyma: i)  Stone Cell     ii)  Fibre C) Complex Permanent Tissue: Xylem:   Tracheid.   Trachea.   Xylem Parenchyma. Xylem Fibre. Phloem: Companion Cell. Sieve Tube. Phloem Parenchyma. Phloem Fibre.   Meristematic Tissue   Structure Cells are living Hexagonal in shape. No inter-cellular space. Nucleus is prominent. Vacuole are small in size. Cell wall is thin. Protoplasm is granular. Retains the power of cell division.   Function It helps the plants to increase in height and girth.   Location A) Apical meristem- Present at the apex of stem and root B) Intercalary meristem- Present in between the permanent tissues C) Lateral meristem- Present at the lateral side of root and stems    Permanent Tissue: A)  Simple Permanent Tissue:   Parenchyma All...
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Structure and Function of Cytoplasmic Organelles of Cell

Structure and Function of Cytoplasmic Organelles of Cell

Hi Viewers: Today we are going to discuss a very important aspect of Structure and Function of Cytoplasmic Organelles of Cell.  These Cytoplasmic organelles are present both in plant cells and in animal cells.  Now let us check out what cytoplasmic organelles are present in the plant cells and in animal cells.  On that basis we will be able to differentiate between the plant cells and animal cells. What is Cytoplasmic Organelles?   All the tiny living inclusions present within the cytoplasm is called cell organelles.      Nucleus   Nucleus is double membrane bound dense spherical body, containing nuclear reticulum, nucleolus and nucleoplasm   Structure:  Under electron microscope the nucleus shows the following structures   Nuclear Membrane: it is delicate, it is porous, it is double layered, its function is to separate nucleus from the surrounding cytoplasm Nucleoplasm: it is dense, its mass is clear, it forms the matrix of the nucleus, its function is to store reserve materials for the cell division Nuclear Reticulum: it is highly coiled structure which...
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Differences Between Cell Wall and Cell Membrane

Differences Between Cell Wall and Cell Membrane

Hi Readers: Today we will discuss about the Differences Between Cell Wall and Cell Membrane. While doing that we will focus on to its structure, function, and location only.  So without further ado, let's get started.....   CELL WALL Differences Between Cell Wall and Cell Membrane have the following: First let us go through the definition: The non-living, Permeable, rigid and thick outer envelope of plant cell composed of Cellulose, Hemicellulose, Lignin, Pectin and Suberin is known as cell wall. Check out the Video explanation from our YouTube Channel: To see more videos like this please click here The Structural features of a cell are as follows:    It is present only in plant cell It is composed of composed of Cellulose, Hemicellulose, Lignin, Pectin and Suberin Matured cell wall is composed of two parts, which are in the following Primary cell wall:  It is the thin outer most layer Secondary cell wall:  It is thick inner layer A cementing layer called middle lamella is present between two adjacent cells Narrow thread...
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Differences between Prokaryotic and Eukaryotic cells

Differences between Prokaryotic and Eukaryotic cells

Hi Readers:   Today we will discuss about the Differences between Prokaryotic and Eukaryotic cells.  So let's dive into it.. Prokaryotic Cells: Pro means primitive and karyon means nucleus.  So the cell which bears the primitive Nucleus is called prokaryotic cells.   Definition:  The primitive type of cells which are devoid of true nucleus and well defined Cytoplasmic Organelles.   Examples:  Bacteria and blue green algae like Nostoc, Anabaena etc.   Structure: Prokaryotic cells are all unicellular organism Cell walls are composed of mucopeptide Nucleus is devoid of nuclear membrane, nucleoplasm and nucleolus Cell organelles like Mitochondria, Endoplasmic Reticulum, Golgi Bodies, Plastids etc are absent Ribosomes are 70S     Eukaryotic Cells:  Eu means True and karyon means nucleus.  So the cells which bears the true nucleus is called eukaryotic cells   Examples:  Eukaryotic cells occur in plant from Algae to Angiosperms                    And                    Eukaryotic cells occur in animal from Protozoa to Human   Structure: Eukaryotic cells are may be unicellular or multicellular Cell walls are composed of cellulose Nucleus have all the four components-- Nuclear Reticulum,...
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Schematic Diagram of Plant Cells

Schematic Diagram of Plant Cells

Hi Readers: Today we will discuss about the Schematic diagram of plant cells, which is very important so far the basic knowledge about the cell is concerned. A living cell is broadly categorized into the Cell wall (in case of plant) or Cell membrane (in case of animal) and Protoplasm. Protoplasm again categorized into cytoplasm and nucleus. The outer portion of cytoplasm is called ectoplasm and the inner part of the cytoplasm is called endoplasm. The nucleus is comprised of the following four important divisions. a) Nucleolus b) Chromatin reticulum or Nuclear reticulum c) Nuclear membrane d) Nucleoplasm To see more videos like this please click here The cytoplasm contains various types of materials, which are broadly categorized into Living inclusion and b) non living inclusions Under living inclusion we do see the following items: a) Mitochondria b) Plastids. These two are called transducers because here energy conversion takes place and they are bounded by double layer membranes. c) Endoplasmic Reticulum d) Golgi bodies e) Lysosomes.  These are called GERL and are single layered membranes. f) Ribosomes. These naked...
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