Organisms and Populations

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

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

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 extremely cold northern regions
move to:

The age pyramid with broad base indicates :

Benthic organisms are affected most by :

Which one of the following is not a parasitic
adaptation ?

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 :

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 :

Consider the following four conditions (a – d)
and select the correct pair of them as adaptation
to environment in desert lizards.
The conditions :
(a) burrowing in soil to escape high temperature
(b) losing heat rapidly from the body dur...

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

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

Large Woody Vines are more commonly found in

The logistic population growth is expressed by
the equation :

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

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

Which one of the following is most
appropriately defined ?

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 years apart. Select the correct
interpretation about them : –

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
reproduction and excrete solid urine
(ii) They do not drink water, breathe at a slow
rate to conser...

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 ?

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:-

Geometric representation of age structure is a characteristic of :-

Niche overlap indicates-

The formula for exponential population growth is-

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

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

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

Which one of the following pairs in
mismatched ?

Certain characteristic demographic features of
developing countries are -

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

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

What is a keystone species ?

The maximum growth rate occurs in :-

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 ?