Organisms and Populations · Biology · NEET

When will the population density increase, under special conditions? When the number of :

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What do 'a' and 'b' represent in the following population growth curve? ...

The equation of Verhulst-Pearl logistic growth is $$\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}\left[\frac{\mathrm{K}-\mathrm{N}}{\mathrm{K}}\right]$$...

Which one of the following factors will not affect the Hardy-Weinberg equilibrium?

Given below are two statements: Statement I: Gause's competitive exclusion principle states that two closely related species competing for different r...

Plants offer rewards to animals in the form of pollen and nectar and the animals facilitate the pollination process. This is an example of :

If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction. What should be their birth rate per snail per y...

Given below are two statements: Statement I : Gause’s ‘Competitive Exclusion Principle’ states that two closely related species competing for the same...

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Which one of the following statements cannot be connected to Predation?

While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, ($$-$$) sign is assigned for detrimental in...

If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ___________ individuals per Drosophila pe...

Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

Amensalism can be represented as :

In the exponential growth equation Nt = N0ert, e represents

The process of growth is maximum during

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

Which of the following is not an attribute of a population?

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The Earth summit held in Rio de Janeiro in 1992 was called :

Natality refers to

In a growing population of a country,

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without th...

Niche is

Pneumatophores occur in

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

Plants which produce characteristic pneumatophores and show vivipary belong to :

Asymptote in a logistic growth curve is obtained when :

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :

Mycorrhizae are the example of :

Which of the following is correct for r-selected species ?

The principle of competitive exclusion was stated by

If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction repres...

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1-N/K)

Gause's principle of competitive exclusion states that -

It is much easier for a small animals to run uphill than for a large animal, because -

In which of the following interactions both partners are adversely affected?

An association of individuals of different species living in the same habitat and having functional interactions is -

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that: ...

Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other ex...

Benthic organisms are affected most by :

Which one of the following is not a parasitic adaptation ?

The age pyramid with broad base indicates :

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...

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

Besides paddy fields, cyanobacteria are also found inside vegetative part of :

Cuscuta is an example of :

The logistic population growth is expressed by the equation :

Which one of the following is categorised as a parasite in true sense ?

Consider the following four conditions (a – d) and select the correct pair of them as adaptation to environment in desert lizards. The conditions : (...

Large Woody Vines are more commonly found in

What type of human population is represented by the following age pyramid ? ...

Which one of the following is most appropriately defined ?

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

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do a, b and c represent respectively – ...

Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of :

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty year...

Quercus species are the dominant component in:

Consider the following four statements (1-4) about certain desert animals such as kangaroo-rat. (i) They have dark colour and high rate of reproducti...

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

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:-

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....

Geometric representation of age structure is a characteristic of :-

Niche overlap indicates-

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example

Which one of the following pairs in mismatched ?

At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation -

More than 70% of world's fresh water is contained in –

In which one of the following habitats does the diurnal temperature of soil surface vary most ?

The maximum growth rate occurs in :-

In which of the following pairs is the specific characteristic of a soil not correctly matched ?

What is a keystone species ?

Certain characteristic demographic features of developing countries are -

Mycorrhiza is an example of :-

Two different species can not live for long duration in the same niche or habitat. This law is : -

What is true for individuals of same species ?

Which type of association is found in between entomophilous flower and pollinating agent ?