Ecology – Populations and Ecosystem

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

When man eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is

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

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

Which one of the following ecosystem types has the highest annual net primary productivity?

Identify the possible link “A” in the following food chain : Plant insect – frog “A” Eagle

The biomass available for consumption by the herbivores and the decomposers is called:

Which one of the following is one of the characteristics of a biological community?

The rate of formation of new organic matter by rabbit in a grassland, is called

Which one of the following is not a gaseous biogeochemical cycle in ecosystem ?

Which one of the following is a primary consumer in maize field ecosystem?

Mass of living matter at a trophic level in an area at any time is called

The slow rate of decomposition of fallen logs in nature is due to their

Secondary productivity is rate of formation of new organic matter by

Geometric representation of age structure is a characteristic of

A high density of elephant population in an area can result in

Which one of the following is not a function of an ecosystem

Which one of the following is not a parasitic adaptation?

The second stage of hydrosere is occupied by plants like

Both, hydrarch and xerarch successions lead to:

Large woody vines are more commonly found in :

About 70% of total global carbon is found in

The upright pyramid of number is absent in

Natural reservoir of phosphorus is :

Cuscuta is an example of

A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

In the case of peppered moth (Biston betularia) the black – coloured form became dominant over the light- coloured form in England during industrial revolution. This is an example of:

The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?

Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct ?

Which one of the following processes during decomposition is correctly described?

Which one of the following statements is correct for secondary succession ?

Two plants can be conclusively said to belong to the same species if they

Pheretima and its close relatives derive nourishment from :

What is true about the isolated small tribal populations?

The correct sequence of plants in a hydrosere is:

The age pyramid with broad base indicates

Benthic organisms are affected most by

Who stated that a population is a self regulating system?

Who coined the term ecosystem?

Which one of the following is the food chain operating in ponds, lakes or sea?

Which of the following species are restricted to an area?

Which of the following sequence is correct?

Which of the following orgainsm form the decomposers

Which of the following is the most stable ecosystem?

Which of the following is the most sparsely populated state of India?

Which of the following exist in maximum number in terms of genera and species?

Which most often limits the primary productivity of the ecosystem?

Which atom is limiting the primary productivity mostly?

What percentage of energy is transferred from one trophic level to another?

Vegetation of tundra consists of

The term ecosystem was first coined by

The sun loving plants are referred as

The soil particles, particularly clay and organic matter in soil contain negative charges that attract positively charged ions such as

The relationship between two organisms where one receives benefit at the cost of the other is known as

The relationship between two organisms in which one is benefitted while the other is neither harmed nor benefitted is known as

The presence of large amount of N₂ in atmosphere is due to presence of

The population dynamics of a species is basically regulated by

The plants, growing on saline soils are called

The place was rocky and burried but now there is a green forest, the sequence of origin is

The part of earth and atomosphere supporting life is

The lower most layer of atmosphere in which man and other living organisms exist is called

The limiting factor in nitrification of soil in

The formula for exponential population growth is

The final stable community in ecological succession is

The essential components of ecosystem, without which ecosystems cannot function, are

The conversion of ammonia into nitrites and nitrates is called

The concept that ‘population tends to increase geometrically while food supply increases arithmetically’ was put forward by

The communities of primary succession are called as

The carrying capacity of a population is determined by its

The abundance of a species population, within its habitat is called

The 10% energy transfer law in a food chain was proposed by

Symbiosis is shown by

Stratification is found in

Source of energy in an ecosystem is

Roots of higher plants show symbiosis with mycorrhizas for obtaining

Role of nitrifying bacteria, in niterogen cycle, is to

Rhododendron is characteristic of vegetation of

Ratio of natality and mortality of a population expressed in percentage is

Rapid decline in the population, due to high mortality rate, is called

Pyramid of energy in a pond ecosystem is always

Predation and parasitism are which type of interactions?

Populations termed r-strategists

Population of different species interacting in an ecosystem

Population explosion has occured in the last

Population exploiting a resource rapidly, and showing unbounding increase in numbers are

Population density of terrestrial organisms is measured in terms of individual per

Pond is an example of which of the following ecosystem?

Plant grows in dry and saline soil is called

Phytoplanktons are dominant in which of the following zone?

Peacock eats a snake and snake eats frog and frog eats insect while insect eats green plant therm position of peacock is

Net primary productivity is

Natality is balanced by mortality. There will be

Maximum biomass & variable organisms are found in

Major source of oil moisture is

In India, tropical rain forests are found in

In India, human population is heavily weighed towards the younger age group as a result of

In Delhi, there is a large gap between birth & death rate. This shows that Delhi has a population of

In an uqright pyramid of biomass, the herbivores occupy the position

In an aquatic ecosystem, the trophic level equivalent to cows in grasslands is

In a grassland ecosystem, if the number of primary producers is approximately 6 million plants the number of top carnivore (in million) which may be supported by it may be

In a forest ecosystem fungi comes under

In a food chain, the total amount of living material is depicted by