Eco system practice · Medium

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is $100 x\left(\mathrm{kcal} \mathrm{~m}^{-2}\right) \mathrm{yr}^{-1},$ what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

Assertion: Phosphorus cycle is an imperfect cycle as a sufficient amount of phosphorus combines with ${Al}^{3+}, {Fe}^{2+}$ and ${Ca}^{2+}$ to form insoluble and unavailable salts.

Reason: Phosphate circulates in abiotic environment in both lithosphere and in atmosphere.

Which of the following features would be characteristic of oceans but not of freshwater ecosystems?

The correct sequence of food chain is

Pyramid of energy in ecosystem is

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as:

During ecological succession:

A detrivore is

Decomposers of an ecosystem includes

Ecological succession is

Select the incorrect statement for ecological pyramid.

In hydrarch succession, the successional series progress from

The organisms, which attack dead animals are

Which of the following are the essential sources for releasing $C{O_2}$ in the atmosphere?
I. Burning of wood
II. Volcanic activity
III. Combustion of organic matter
IV. Fossil fuels
Choose the correct option

Green plants and green sulphur bacteria, prepare their organic food themselves with the help of sunlight, are known as

It is an example of amphibious plant

Which of the following is false?

Consider the following statements about food chain
I. The transfer of energy from producers to top consumers through a series of organisms is called food chain
II. A food chain is always straight and proceeds in a progressive straight line
III. In a food chain, there is unidirectional flow of energy from sun to producers and subsequently to series of different types of consumers
Which of the statements given above are correct?

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?
$\mathrm{Plant} \to \mathrm{mice} \to \mathrm{Snake} \to \mathrm{Peacock}$

All the animals that depend on plants for food are called

Assertion: The excess of organic matter is stored by green plants for the utilization by the herbivores.

Reason: Work energy put by man in agriculture is used in the ecosystem.

Which creatures are direct or indirect food of all creatures on the ocean’s surface?

10 per cent law of energy transfer’ is applicable during the transformation of ____ to _____

PAR stands for

The relation between producers and consumers in an ecosystem can be graphically represented in the form of a pyramid called

Pyramid of energy in aquatic ecosystem is

Which of the following organism types would probably rank the highest in terms of their expected efficiency of energy transfer between trophic levels?

Out of the following biogeochemical cycles which one is gaseous?
I. sulphur II. Phosphorus
III. nitrogen IV. Carbon
Choose the correct option

Percentage of Photosynthetically Active Radiation (PAR) that is captured by plants in synthesis of organic matter is

Biotic community along with its interacting physical environment comprises