Home
Class 12
BIOLOGY
Productivity is the rate of production o...

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)`

A

ii

B

iii

C

ii and iv

D

I and iii

Text Solution

Verified by Experts

The correct Answer is:
C
The rate of synthesis of energy containing organic matter or biomass by any trophic level per unit area in unit time is described as its productivity. It is measured as weight (e.g., `g//m^(2)//yr`) or energy (e.g, `Kcal//m^(2)yr`). Hence, only unit (iv) is correct.
Promotional Banner

Similar Questions

Explore conceptually related problems

Fifth term of a GP is 2, then the product of 1ts 9 terms is

Find the value of x for which the following expression are defined (i) sin^(-1) (3x -2) (ii) cos^(-1) (log_(e) x) (iii) sec^(-1) (x^(2) -2)

Find the principal value of the following: (i) cosec^(-1)(2) (ii) tan^(-1) (-sqrt3) (iii) cos^(-1) (-(1)/(sqrt2))

Integrate the following with respect to x. (i) 1/(e^(-x)) " " (ii) (x^2)/(x^3) " " (iii) 1/(x^3) " " (iv) 1/(1 + x^2) .

Convert 3 ms^(-2) "to km" h^(-2) (ii) G = 6.67 xx 10^(-11) N m^(2) kg^(-2) to cm^(3) g^(-1) s^(-2)

Which of the following expression are polynomial .if not give reason : (i) (1)/( x^(2)) +3x -4 (ii) x^(2) (x-1) (iii) (1)/(x) (x+5) (iv) (1)/(x^(-2) ) +(1)/( x^(-1)) +7 (v) sqrt (5) x ^(2) + sqrt 3x +sqrt2 (vi ) m^(2) -3sqrt (m) +7m-10

Find the transpose of each of the following matrices: (i)[(5),((1)/(2)),(-1)] (ii) [(1,-1),(2,3)] (iii) [(-1,5,6),(sqrt(3),5,6),(2,3,-1)]

G = 6.67xx10^(-11) N m^(2)(kg)^(-2) = ………. (cm)^(3)s^(-2)g^(-1) .

Factorise the following expressions: (i) x^(2) + 4x + 4 (ii) 3a^(2) -24ab+ 48b^(2) (iii) x^(5) -16x (iv) m^(2) +(1)/( m^(2)) -23 ( v) 6-216x^(2) (vi) a^(2) +(1)/( a^(2)) -18