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ANATOMY OF FLOWERING PLANTS PART-1: PLANT TISSUE

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In this post we are going to discuss about Plant Tissue. For the post of Morphology and Anatomy of Frog, Click  here . Plant   Tissue  : •A tissue is a group of cells having a common origin and usually performing a common function.  •A plant is made up of different kinds of tissues.  •Tissues are classified into two main groups, namely, meristematic and permanent tissues based on whether the cells being formed are capable of dividing or not. For the post of Morphology and Anatomy of Cockroach, Click  here . Meristematic   Tissue  : •Growth in plants is largely restricted to specialised regions of active cell division called meristems (Gk. meristos: divided).  •Plants have different kinds of meristems.  •The meristems which occur at the tips of roots and shoots and produce primary tissues are called apical meristems.  •Root apical meristem occupies the tip of a root while the shoot apical meristem occupies the distant most region of ...
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ANIMAL KINGDOM Part-3, NCERT Class-11

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Body Organisation Animals have three germinal layers of cell in their embryonic stage. Those layers are called Ectoderm , Endoderm and Meroderm . On the basis of presence of mesoderm or middle layer, animals are divided into two  categories- • Diploblastic: Animals that have only two embryonic layers are called diploblastic body organisation. They lac the mesoderm layer. An undifferentiated layer called mesoglea is present instead of mesoderm e.g. Coelenterates • Triploblastic: Animal that have all three embryonic layers are called to have triploblastic body organisation. Mesoderm is present in between Ectoderm and Endoderm. e.g. Platyhelminthes to Chordates   Body organisation (Germinal layers) (a) Diploblastic (b) Triploblastic Click  here  for part 1 of this chapter Click  here  for part 2 of this chapter
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ANIMAL KINGDOM Part-1, NCERT Class-11

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Basis of Classification: Levels of Organisation *All members of Kingdom Animalia is multicellular •Cellular Level of Organisation:   1) Cells are arranged as loose aggregates   2) Some division of labour occur among the cells e.g. Sponges •Tissue Level of Organisation: 1) Cells performing the same function are arranged intotossues e.g. Coelenterates •Organ Level of Organisation: 1) Tissues are grouped together to form organs, each specialised for a particular function e.g. Platyhelminthes •Organ System Level of Organisation: 1) Organs have associated to form functional systems, each system concerned with specific physiological function  e.g. Annelids to Chordates Types in case of Organ System Level of Organisation: •Incomplete Digestive System:      Possess only one single opening outside the body which act as both mouth and anus e.g. Platyhelminthes •  Complete Digestive System:     Possess two openings • Open Type Circulatory System: ...
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