Question

Match List I with List II :

List I                       List II
A. Productivity              I. Gross primary productivity minus respiration losses
B. Net primary productivity  II. Rate of formation of new organic matter by consumers
C. Gross primary productivity III. Rate of biomass production
D. Secondary productivity    IV. Rate of production of organic matter during photosynthesis

Choose the correct answer from the options given below :

• A. A-III, B-I, C-IV, D-II
• B. A-I, B-II, C-III, D-IV
• C. A-III, B-I, C-II, D-IV
• D. A-I, B-III, C-IV, D-II

Hint:

Gross is the Total check, Respiration is the Tax, and Net is what you actually get to Keep (and pass on to the next level).

Answer 1

The Correct Option is A

Step 1: Understanding the Question
The objective is to match ecological productivity terms with their formal scientific definitions. These terms describe the rate at which energy or biomass is captured and stored within different levels of an ecosystem's food web. Step 2: Key Formula or Approach
Understand the hierarchy of energy flow. - Primary refers to plants (producers). - Secondary refers to animals (consumers). - Gross is the total amount. - Net is what remains after metabolic costs (respiration) are subtracted. The key equation is: $\text{NPP} = \text{GPP} - \text{Respiration}$. Step 3: Detailed Explanation
A. Productivity: In the most general sense, productivity refers to the rate at which biomass is produced by organisms in an ecosystem. Thus, A matches with III.
B. Net primary productivity (NPP): This is the actual biomass that remains in a plant after it has used some for its own breathing and maintenance. NPP is the energy available to the next trophic level. Thus, B matches with I.
C. Gross primary productivity (GPP): This represents the total rate at which solar energy is captured and converted into chemical energy (organic matter) during photosynthesis. Thus, C matches with IV.
D. Secondary productivity: This describes the rate at which organic matter is synthesized by consumers (like herbivores or carnivores) using the energy they consumed. Thus, D matches with II.
Step 4: Final Answer
The correct sequence is A-III, B-I, C-IV, D-II. This corresponds to option (A).