Choose correct sentence.
Choose correct sentence.
- A
Except for the deep sea hydro - thermal ecosystem, sun is the only source of energy for all ecosystems on earth of the incident solar radiation more than 50 percent of it is photo synthetically active radiation (PAR).
- B
Plant capture only $10-20$ percent of the PAR and this small amount of energy sustains the entire living world.
- C
All organisms are dependent for their food on producers.
- D
Primary producers in an aquatic ecosystem are zooplanktons.
Similar Questions
Food chain is a series of population, which starts with producers. It is concerning with
Food chain is a series of population, which starts with producers. It is concerning with
Which of the following is a primary consumerin maize field ecosystem ?
Which of the following is a primary consumerin maize field ecosystem ?
- [NEET 2013]
$A$ : In secondary productivity, no new organic matter is formed.
$R$ : It is only utilisation of part of food manufactured by primary producers in building of consumer biomass.
$A$ : In secondary productivity, no new organic matter is formed.
$R$ : It is only utilisation of part of food manufactured by primary producers in building of consumer biomass.
Consider the following statements concerning food chains.
$I$. Removal of $80\; \%$ tigers from an area resulted in greatly increased growth of vegetation.
$II.$ Removal of most of the carnivores resulted in an increased population of deers.
$III.$ The length of food chains is generally limited to $3$ to $4$ trophic levels due to energy loss.
$IV.$ The length of food chains may vary from $2$ to $8$ trophic levels.
Which two of the above statements are correct?
Consider the following statements concerning food chains.
$I$. Removal of $80\; \%$ tigers from an area resulted in greatly increased growth of vegetation.
$II.$ Removal of most of the carnivores resulted in an increased population of deers.
$III.$ The length of food chains is generally limited to $3$ to $4$ trophic levels due to energy loss.
$IV.$ The length of food chains may vary from $2$ to $8$ trophic levels.
Which two of the above statements are correct?
Biological equilibrium is an equilibrium among the
Biological equilibrium is an equilibrium among the