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Robert Hook (1665) :...

Robert Hook (1665) :

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He first of all studied bark of an oak tree under microscope and proposed the word cell.
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Robert Brown (1831) :

Who has tried to estimate the value of ecological services? (A) Darwin (B) Robert May (C) Robert Constanza (D) David Tilman

Knowledge Check

  • Contagium vivum fluidum was proposed by (A) D. J. Ivanowsky (B) M. W. Beijerinck (C) Stanley (D) Robert hook

    A
    D.J. Ivanowsky
    B
    M.W. Beijerinek
    C
    Stanley
    D
    Robert Hook

  • What price tag did Robert Constanza put for undamental ecosystem services ?

    A
    33 trillion US `$`
    B
    22 trillion US `$`
    C
    11 trillion US `$`
    D
    44 trillion US`$`

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    Who gave the word Protoplasm ? (a) Purkinje (b) Hook (c) A K Sharma (d) Schwann

    According to Robert may, what in the total number of specis present on earth ?

    Robert constanza and his calleagues have very recently tried to put price tags on nature's life support services. They have part an average price tag of one year is :-

    Figure shows the relationship between tensile stress and strain for a typical material. Below proportional point A, stress is directly proportional to strain which means Young's moudulus (Y) is a constant. In this region the material obeys Hooke's law. Provided the strain is below the yield point 'B' the material returns to its original shape and size when the force is removed. Beyond the yield point, the material retains a permancnt deformation after the stress is removed. For stresses beyond the yeld point, the material exhibit plastic flow, which means that it continues to elongate for little increases in the stress. Beyond C a local constriction occurs. The material fractures at D (i.e. breaking point). The graph below shows the stress-strain curve for 4 different materials. If you bough a new shoe which bites in the beginning and later on fits perfectly, then the material used to making the shoe is

    Figure shows the relationship between tensile stress and strain for a typical material. Below proportional point A, stress is directly proportional to strain which means Young's moudulus (Y) is a constant. In this region the material obeys Hooke's law. Provided the strain is below the yield point 'B' the material returns to its original shape and size when the force is removed. Beyond the yield point, the material retains a permancnt deformation after the stress is removed. For stresses beyond the yeld point, the material exhibit plastic flow, which means that it continues to elongate for little increases in the stress. Beyond C a local constriction occurs. The material fractures at D (i.e. breaking point). The graph below shows the stress-strain curve for 4 different materials. Material which is good for making wires by stretching is

    Figure shows the relationship between tensile stress and strain for a typical material. Below proportional point A, stress is directly proportional to strain which means Young's moudulus (Y) is a constant. In this region the material obeys Hooke's law. Provided the strain is below the yield point 'B' the material returns to its original shape and size when the force is removed. Beyond the yield point, the material retains a permanent deformation after the stress is removed. For stresses beyond the yeld point, the material exhibit plastic flow, which means that it continues to elongate for little increases in the stress. Beyond C a local constriction occurs. The material fractures at D (i.e. breaking point). The graph below shows the stress-strain curve for 4 different materials. Material which is most brittle is

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