Q. Choose the correct statements I. Productivity is expressed in $gm^{- 2}yr^{- 1}$ or (kcal $m^{- 2})yr^{- 1}$ II. The amount of biomass or organic matter produced per unit area over a time period in plants during photosynthesis is called primary production III. Primary production is expressed in term of weight $(g^{- 2})$ or energy $(kcal\ m^{- 2})$ IV. Sugarcane have more efficiency to trap sunlight, so they accumulate more primary productivity Choose the correct option
A) I and II
B) I and IV
C) I, II, III and IV
D) None of these
Explanation
The rate of synthesis of energy containing organic matter by any trophic level per unit area in unit time is described its productivity. It is measured as weight ($e.g.,$ $g/m^{2}/yr$) or energy ($e.g.,$ $kcal/m^{2}/yr$). The amount of energy accumulation in green plants as biomass or organic matter per unit area over a time period through the process of photosynthesis is known as primary productivity. Primary productivity is expressed in term of weight $(g^{- 2})$ or energy $(kacl\ m^{- 2})$. $C_{4^{-}}$ plants area more productive that $C_{3}$ plants. Sugar cane is most productive crop being efficient in trapping light
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.