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The amount of organic matter produced pe...

The amount of organic matter produced per unit area over a time period by plants during photosynthesis is called

A

Productivity

B

Primary Production

C

Gross productivity

D

Secondary productivity

Text Solution

Verified by Experts

The correct Answer is:
B
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A metal rod AB of length 10x has its one end A in ice at 0^@C and the other end B in water at 100^@C . If a point p on the rod is maintained at 400^@C , then it is found that equal amounts of water and ice evaporate and melt per unit time. The latent heat of evaporation o water is 540 cal/g and latent heat of melting of ice is 80 cal/g. If the point p isa t a distance of lamdax from the ice end A. The value of lamda is : [Neglect any heat losss to the surroundings]

Knowledge Check

  • In an ecosystem the rate of production of organic matter during photosynthesis is termed as:

    A
    Net productivity
    B
    Net primary productivity
    C
    Gross primary productivity
    D
    Secondary productivity

  • The amount of oxygen used by the suitable microorganisms present in water during five days at 20^(@)C is called as BOD. For pure water BOD is about 1 ppm fairly pure water 3 ppm and doubtful purity 5 ppm the municipal sewage has BOD values 100-4000 ppm. BOD= Number of moles of O_2 required / Number of liters of water sample BOD is normally cxpressed for a time period of

    A
    5 hours
    B
    5 minutes
    C
    5 days
    D
    5 seconds

  • Carbon - 14 is used to determine the age of organic material . The procedure is based on the formation of ""^(14) C by neutron capture in the atmosphere . T_(1) - T_(2) = (1)/(lambda) "log" (C_(1))/(C_(2)) ""^(14) C is absorbed by living organisms during photosynthesis . The ""^(14) C content is content is constant in living organism once the plant or animal dies , the uptake of carbon dioxide by it increases and the level of ""^(14) C in the dead being falls due to the decay which C^(14) undergoes . ""_(6)^(14) C to ""_(7)^(14) N + beta^(-) (""_(-1)^(0)e) . The half- life period of ""^(14) C is 5770 years . The decay constant (lambda) can be calculated using the formula lambda = (0.693)/(t_(1//2)) . The comparison of the b^(-) activity of the dead matter with that of the carbon still in circulation enables measurement of the period of the isolation of the material from the living cycle . the method , however , ceases to be accurate over period longer than 30,000 years . The proportion of ""^(14) C to ""^(12) C in living matter is 1 : 10^(2) Which of the following options is correct ?

    A
    In living organisms , circulation of `""^(14) C` from atmosphere is high so the carbon content is constant in organism
    B
    Carbon dating can be used to find out the age of earth crust of rocks
    C
    Radioactive material absorption is equal to its rate of decay , hence the carbon content remains constant in living organism.
    D
    Carbon dating cannot be used to determine concentration of `""^(14) C` in dead being .

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