Productivity is the rate of production of biomass expressed in terms of
(i) `("kcal"m^(-3))yr^(-1)`
(ii) `g^(-2)yr^(-1)`
(iii) `g^(-1)yr^(-1)` (iv) `("kcal"m^(-2))yr^(-1)`

Productivity is the rate of production of biomass expressed in terms of: (kcal m^(-3)) yr^(-1) g^(-2) yr^(-1 ) g^(-1) yr^(-1) kcak m^(-2) yr^(-1)

Rate of biomass production is expressed as : (a) (kcalm^(-2))yr^(-1) (b) kcalg m^2yr^(-1) (c) gm^3yr (d) gm^(-2)yr

Primary production is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis . It is expressed in term of (a) Weight (g^(-2)) (b) Weight (g^(-2)yr^(-1)) (c) Energy (kcal m^(-2) ) d. Energy (kcal m^(-2)yr^(-1) )

Calculate the half-life of a first order reaction, from their rate constants given below. 4" yr"^(-1)

Daily requirement of protein for a child (1-3 yrs) is

If x^(2)+y^(2)+z^(2)=r^(2) , then Tan^(-1)((xy)/(zr))+Tan^(-1)((yz)/(xr))+Tan^(-1)((xz)/(yr))=

The half life period of four isotopes (i) 6.7 yr " " (ii) 8xx10^(3) yr (iii)5760 yr " " (iv) 2*35xx10^(5) yr, The most stable isotope is