Eco system practice · Mixed difficulty

Secondary producers in an ecosystem are

What is the available biomass for the consumption to the heterotrophs (particularly herbivores)?

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 _____

Assertion: Mosses and lichens are said to form the pioneer community in xerarch succession.

Reason: It is because during the course of succession these species get established later.

PAR stands for

The organic substance, which decompose slowly are

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

Assertion: Insectivorous habitat of plants is to cope up ${N}_2$ deficiency.

Reason: Insectivorous plants are partly autotrophic and partly heterotrophic.

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

Which of the following factor is contributing to an overload of the carbon cycle?

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

An inverted pyramid of …A… may occasionally be observed in …B… communities

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

Statement I: The most productive area of the ocean is near the shore.
Statement II: Decomposition takes place at maximum rate on upper layer of soil.

Succession on bare land converts it into

Ecosystem may be defined as

Which one of the following types of organisms occupy more than one trophich level in a pond ecosystem?

Biotic community along with its interacting physical environment comprises

Which of the following two organisms are producers?

Assertion: The conversion of productivity at next trophic level is $10 \%$.

Reason: Energy is lost in the respiration process.

The statement, ‘Tiger is in the apex of food chain’, indicates

Sunken stomata is found in the leaves of

The flow of DDT through the food chain, culminating in the deaths of cats in Borneo, represents the:

Which of these decreases in climax stage than the several stages during ecological succession?

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 3-4 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?

One model that shows how energy passes from one trophic level to another trophic level is called

Calculate the amount of energy available at the level of lion in the given food chain if the energy available at grass level is $2500 \mathrm{~kJ}$

Grass $\rightarrow$ Cow $\rightarrow$ Lion