Ecosystem Test ...

Choose the correct answers from the alternatives given .
Endergonic reactions

Choose the correct answers from the alternatives given .
Which of the following metabolic processes can occur without a net influx of energy from some other process ?

Quantities of mineral nutrients in soils of tropical rainforests are relatively low because

Which of the following representations shows the pyramid of number in a forest ecosystem? 

Mycorhhiza is an example of : -

Study the following statements and select the incorrect ones.
(i) Pyramids of energy and yearly biomass production can never be inverted, since this would violate the laws of thermodynamics.
(ii) Pyramids of standing crop and numbers can be inverted, since the number of organisms at a time does not indicate the amount of energy flowing through the system.
(iii) There are certain limitations of ecological pyramids such as they do not take into account the same species belonging to two or more trophic levels.
(iv) Saprophytes are not given any place in ecological pyramids even though they play a vital role in the ecosystem.

The species of plants that play a vital role in controlling the relative abundance of other species in a community are called

In order to estimate the gross primary productivity (GPP) of a pond containing phytoplankton and zooplankton, a student collected water samples from the pond in two bottles labelled X and Y. The dissolved oxygen (DO) of the samples immediately after collection was $$8$$mg $$ml^{-1}$$. The DO content when measured after $$24$$ hours of incubation was as follows:
Bottle X: $$2$$ mg $$ml^{-1}$$ after incubation in dark
Bottle Y: $$18$$ mg $$ml^{-1}$$ after incubation in light
GPP of the pond is?

In an open ocean, the biomass of primary producers (microscope algae) is often lower than the biomass of higher trophic levels (zooplankton and fish), as illustrated by an inverted pyramid of biomass. How can there be enough food in an open ocean to support the higher trophic levels?

The given pyramid best represents