Question:
Define primary and secondary productivity.
Define primary and secondary productivity.
Show Hint
Primary productivity = Energy by plants.
Secondary productivity = Energy transfer to herbivores and carnivores.
Secondary productivity = Energy transfer to herbivores and carnivores.
Updated On: Mar 7, 2025
Hide Solution
Verified By Collegedunia
Solution and Explanation
Primary productivity: The rate at which autotrophs (e.g., plants) convert sunlight into chemical energy (biomass).
Secondary productivity: The rate at which consumers convert organic material into their own biomass.
Primary productivity refers to the total energy fixed by autotrophs through photosynthesis. It includes:
- Gross primary productivity (GPP): Total energy produced.
- Net primary productivity (NPP): Energy available to herbivores after respiration losses.
Secondary productivity is the energy assimilated by consumers (herbivores, carnivores) from plant material.
Was this answer helpful?
0
0
Top Questions on Ecology
- Given below are two statements:
Statement I: In an ecosystem, there is unidirectional flow of energy of sun from producers to consumers.
Statement II: Ecosystems are exempted from the law of thermodynamics. - Given below are two statements:
Statement I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
Statement II: Fig wasp and fig tree exhibit a mutual relationship as the fig wasp completes its life cycle in the fig fruit and the fig fruit gets pollinated by the fig wasp. - Match List - I with List II
List I List II A. The Evil Quartet III. Causes of biodiversity losses B. Ex situ conservation I. Cryopreservation C. Lantana camara II. Alien species invasion D. Dodo IV. Extinction - Which of the following is the unit of productivity of an Ecosystem?
- Write short notes on any two of the following: ( Red Data Book
View More Questions
Questions Asked in UP Board XII exam
- The first thing that a scholar should bear in mind is that a book ought not to be read for mere amusement. Half-educated persons read for amusement, and are not to be blamed for it; they are incapable of appreciating the deeper qualities that belong to a really great literature. But a young man who has passed through a course of university training should discipline himself at an early day never to read for mere amusement. And once the habit of this discipline has been formed, he will find it impossible to read for mere amusement. He will then impatiently throw down any book from which he cannot obtain intellectual food, any book that does not make an appeal to the higher emotions and to his intellect. But on the other hand, the habit of reading for amusement becomes with thousands of people exactly the same kind of habit as wine-drinking or opium-smoking; it is like a narcotic; something that helps to pass the time, something that keeps up a perpetual condition of dreaming, something that eventually results in destroying all capacity for thought, giving exercise only to the surface parts of the mind, and leaving the deeper springs of feeling and the higher faculties of perception unemployed.
- UP Board XII - 2025
- Reading Comprehension
- Out of debt, out of danger is, like many other proverbs, full of wisdom ; but the word 'danger' does not sufficiently express all that the warning demands. To one that is not insensible, a state of debt is a state of positive misery ; the sufferer is as one haunted by an evil spirit, and his heart can know neither rest nor peace till it is cast out. But as example is at all times more instructive than mere words of mouth, a living writer shall describe his own feelings when beset with creditors, and perhaps he may prove a beacon to the thoughtless ones who are likely to fall into the same gulf.
- UP Board XII - 2025
- Reading Comprehension
- What was the third level? Where was it situated?
- UP Board XII - 2025
- Literature
- What did the astrologers tell when the tiger king was born?
- UP Board XII - 2025
- Literature
- Read the following extract carefully and answer the questions that follow:
Now we will count to twelve.
and we will all keep still.
for once on the face of the Earth
let's not speak in any language,
let's stop for one second,
and not move our arms so much.
(a) What does the poet say in the first two lines?
(b) What does the poet want once on the face of the Earth?
(c) What does the poet want for one second?
- UP Board XII - 2025
- Literature
View More Questions