Identify the incorrect pair.

I. Net Primary Productivity - Available organic matter for the consumers
II. Primary Productivity - Amount of production of organic matter during photosynthesis
III. Gross Primary Productivity - Amount of biomass produced per unit area over a certain period of time by plants during photosynthesis

II only

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I only

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I and II

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II and III

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Solution

The correct option is D II and III
Productivity is the rate at which organic matter/biomass (total mass of all living organisms per unit area at a given time) is produced per unit area.

Primary productivity is the rate (not amount) of biomass produced by plants during photosynthesis per unit area at a given time period. Hence II is incorrect.

Gross primary productivity refers to the rate of biomass production during phosynthesis. Therefore, III is incorrect.

Net primary productivity (NPP) refers to the remainder of the gross product which is left, after its use by the producers in the process of respiration. Thus, net primary productivity is the biomass that is available to the heterotrophs (organisms which depend on producers for food) in an ecosystem for consumption. Therefore, I is correct.

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Similar questions

Q. Assertion :Amount of organic matter synthesised by producers per unit time and per unit area during the process of photosynthesis is referred to as net primary productivity. Reason: Primary productivity is usually high and sustained throughout the year in temperate areas due to abundance of sunlight.

Q. Assertion: Net primary productivity (NPP) is always more than gross primary productivity.
Reason: Net primary productivity (NPP) is the amount of organic matter that is lost by the producers during respiration.

Match List–I with List–II and select the correct answer using the codes given below the lists

$\begin{matrix} L i s t I & L i s t I I A . A . T h e a m o u n t o f e n e r g y a c c u m u l a t i o n i n & 1. G r o s s p r i m a r y p r o d u c t i v i t y . g r e e n p l a n t s t h r o u g h t h e p r o c e s s o f p h o t o s y n t h e s i s B . T h e t o t a l o r g a n i c m a t t e r s y n t h e s i z e d b y & 2. P r i m a r y p r o d u c t i v i t y t h e p r o d u c e r s i n t h e p r o c e s s o f p h o t o s y n t h e s i s p e r u n i t t i m e a n d a r e a . C . R a t e o f s t o r a g e o f o r g a n i c m a t t e r & 3. S e c o n d a r y p r o d u c t i v i t y i n p l a n t t i s s u e s i n e x c e s s o f t h e r e s p i r a t o r y u t i l i z a t i o n d u r i n g t h e m e a s u r e m e n t p e r i o d D . R a t e o f e n e r g y s t o r a g e a t c o n s u m e r l e v e l & 4. N e t p r i m a r y p r o d u c t i v i t y \end{matrix}$

Q. The amount of biomass product per unit area over a time period by plants during photosynthesis is called

Q. Which of the following statement(s) about productivity is/are incorrect?
I. Gross primary productivity of an ecosystem is the rate of production of organic matter per unit area during photosynthesis.
II. Gross primary productivity is measured in terms of kcal/m²/year
III. Net primary productivity of oceans is much higher than that of land masses on earth.
IV. Gross primary productivity = Net primary productivity - Respiration losses (R)

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