Productivity Questions in English

(C) The total annual net primary productivity $(NPP)$ of the entire biosphere is estimated to be approximately $170$ billion tons (dry weight) of organic matter. This value represents the total amount of biomass produced by all producers (plants,algae,and bacteria) on Earth in a year after accounting for the energy used in respiration.

(C) The total annual net primary productivity of the whole biosphere is approximately $170$ billion tons (dry weight) of organic matter. This value represents the total biomass produced by all producers (both terrestrial and aquatic) on Earth in a year.

(B) The Net Primary Productivity $(\text{NPP})$ values are as follows:
$1$. The $\text{NPP}$ of the ocean is approximately $55$ billion tons per year.
$2$. The total annual $\text{NPP}$ of the whole biosphere is approximately $170$ billion tons.
$3$. The $\text{NPP}$ of the terrestrial ecosystem is approximately $115$ billion tons per year.
$4$. Secondary productivity is the rate of formation of new organic matter by consumers (heterotrophs).
Therefore,the correct matching is: $(a-iii), (b-ii), (c-i), (d-iv)$.

(A) The annual net primary productivity of the whole biosphere is estimated to be approximately $170$ billion tons (dry weight) of organic matter. This value represents the total amount of biomass produced by all producers (plants, algae, and bacteria) across the entire planet in a year.

(A) The correct answer is $A$.
The annual net primary productivity of the entire biosphere is approximately $170$ billion tons of organic matter (dry weight).
This value represents the biomass available for consumption by heterotrophs.

(A) The correct option is $A$.
Net primary productivity $(NPP)$ is the biomass available for consumers (herbivores and decomposers) for consumption.
Gross primary productivity $(GPP)$ of an ecosystem is the rate of production of organic matter during photosynthesis.
During respiration $(R)$,organic compounds are oxidized to release energy,producing carbon dioxide and water.
Therefore,when the energy lost through respiration $(R)$ is subtracted from the total gross primary productivity $(GPP)$,we obtain the net primary productivity $(NPP)$.
Mathematically,this is expressed as: $NPP = GPP - R$.

(C) The correct answer is $C$.
Net Primary Productivity $(NPP)$ is defined as the amount of biomass available for consumption by heterotrophs (herbivores and decomposers).
Tropical rain forests exhibit the highest $NPP$ among all terrestrial ecosystems.
This is because these regions receive abundant sunlight,high rainfall,and maintain warm temperatures throughout the year,which are optimal conditions for photosynthesis and plant growth.
Consequently,there is a dense concentration of vegetation at all levels,leading to maximum biomass production.

(B) The correct answer is $B$ (secondary productivity).
Net primary productivity is the biomass available for consumers (herbivores and decomposers) for consumption.
These organisms (heterotrophs) also produce new organic matter,and this process is called secondary production because it depends on the production of autotrophic organisms.
The rate of production of organic compounds by heterotrophs is known as secondary productivity.
Since deer are herbivores (heterotrophs),the rate at which they form new organic matter is termed secondary productivity.

(C) The correct matches are as follows:
$A$. Productivity is defined as the rate of biomass production $(A-III)$.
$B$. Net primary productivity $(NPP)$ is the Gross primary productivity $(GPP)$ minus respiration losses $(R)$,i.e.,$NPP = GPP - R$ $(B-I)$.
$C$. Gross primary productivity is the rate of production of organic matter during photosynthesis $(C-IV)$.
$D$. Secondary productivity is the rate of formation of new organic matter by consumers $(D-II)$.
Therefore,the correct sequence is $A-III, B-I, C-IV, D-II$. Thus,option $(3)$ is correct.