Choose the correct sentence.
- AExcept for the deep sea hydrothermal ecosystem,the sun is the only source of energy for all ecosystems on Earth; of the incident solar radiation,more than $50$ percent is photosynthetically active radiation $(PAR)$.
- BPlants capture only $2-10$ percent of the $PAR$,and this small amount of energy sustains the entire living world.
- CAll organisms are dependent for their food on producers.
- DPrimary producers in an aquatic ecosystem are zooplanktons.
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Similar Questions
How many statements are correct?
$(a)$ Some animals like cockroaches,crows,etc.,are omnivores.
$(b)$ Detritus food chain $(DFC)$ begins with dead organic matter.
$(c)$ Each trophic level has a certain mass of living material at a particular time called as standing crop.
$(d)$ Species composition and stratification are two main structural features of an ecosystem.
$(a)$ Some animals like cockroaches,crows,etc.,are omnivores.
$(b)$ Detritus food chain $(DFC)$ begins with dead organic matter.
$(c)$ Each trophic level has a certain mass of living material at a particular time called as standing crop.
$(d)$ Species composition and stratification are two main structural features of an ecosystem.
Medium
View SolutionRead the following statements carefully and answer the question given below:
$(1)$ $NPP = GPP - R$
$(2)$ Productivity of an ecosystem can be measured in $g/m^2/yr$ or $kcal/m^2/day$.
$(3)$ The total amount of energy produced by all producers in an ecosystem is called Gross Primary Productivity $(GPP)$.
$(4)$ The net primary productivity of the oceans is $55$ billion tons.
State the number of correct statements.
$(1)$ $NPP = GPP - R$
$(2)$ Productivity of an ecosystem can be measured in $g/m^2/yr$ or $kcal/m^2/day$.
$(3)$ The total amount of energy produced by all producers in an ecosystem is called Gross Primary Productivity $(GPP)$.
$(4)$ The net primary productivity of the oceans is $55$ billion tons.
State the number of correct statements.
Medium
View SolutionThe changes that occur in successive seral stages to reach a climax community are:
$I.$ Changes in the diversity of species of organisms.
$II.$ Increase in the number of species and organisms.
$III.$ Increase in the total biomass.
Choose the correct option.
$I.$ Changes in the diversity of species of organisms.
$II.$ Increase in the number of species and organisms.
$III.$ Increase in the total biomass.
Choose the correct option.
Medium
View SolutionMatch the following columns:
Column-$I$ Column-$II$ $(i)$ Ecosystem $(P)$ Bacteria,Fungi $(ii)$ Food chain $(Q)$ Nutrient cycling $(iii)$ Birds $(R)$ Primary consumer $(iv)$ Decomposers $(S)$ Deer
| Column-$I$ | Column-$II$ |
| $(i)$ Ecosystem | $(P)$ Bacteria,Fungi |
| $(ii)$ Food chain | $(Q)$ Nutrient cycling |
| $(iii)$ Birds | $(R)$ Primary consumer |
| $(iv)$ Decomposers | $(S)$ Deer |
Medium
View Solution$A$ food chain consists of:
Easy
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