Match Column - I with Column - II Column-I Column-II a Saprophyte i Symbiotic association of fungi with plant roots b Parasite i i Decomposition of dead organic materials c Lichens i i i Living on living plants d Mycorrhiza i v Symbiotic association of algae and fungi Choose the correct answer from the options given below:

a - i i ; b - i i i ; c - i v ; d - i

a - i ; b - i i ; c - i i i ; d - i v

a - i i i ; b - i i ; c - i ; d - i v

a - i i ; b - i ; c - i i i ; d - i v

EASY

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All the following are examples of commensalism except:

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Important Questions on Organisms and Populations

HARD

Biology>Ecology>Organisms and Populations>Population

Match the following and select the correct option:

(a)	Earthworm	(p)	Pioneer species
(b)	Succession	(q)	Detrivore
(c)	Ecosystem service	(r)	Natality
(d)	Population growth	(s)	Pollination

EASY

Biology>Ecology>Organisms and Populations>Population

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

HARD

Biology>Ecology>Organisms and Populations>Population

Asymptote is a logistic growth curve is obtained when

EASY

Biology>Ecology>Organisms and Populations>Population

The impact of immigration on population density is:

EASY

Biology>Ecology>Organisms and Populations>Population

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

EASY

Biology>Ecology>Organisms and Populations>Population

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

EASY

Biology>Ecology>Organisms and Populations>Population

The principle of competitive exclusion was stated by

EASY

Biology>Ecology>Organisms and Populations>Population

The shape of the pyramids reflects the growth status of the population. Identify the type of age pyramid represented below for human population.

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MEDIUM

Biology>Ecology>Organisms and Populations>Population

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.

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EASY

Biology>Ecology>Organisms and Populations>Population

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

EASY

Biology>Ecology>Organisms and Populations>Population

Which of the following statements is incorrect?

EASY

Biology>Ecology>Organisms and Populations>Population

Gause's principle of competitive exclusion states that:

HARD

Biology>Ecology>Organisms and Populations>Population

Which of the following statements is/are incorrect?
1) The human liver fluke, a nematode parasite, depends on two intermediate hosts (a snail and a fish) to complete its life cycle.
2) The malarial parasite needs a vector (mosquito) to spread to other host organisms.
3) In case of brood parasitism, the eggs of parasitic birds (e.g., cuckoo) are not detected and removed from the nest because the parasite's eggs resemble the host's eggs in morphology and colour.
4) A population of frogs protected from all predators would decrease indefinitely.

HARD

Biology>Ecology>Organisms and Populations>Population

Match Column - I with Column - II

	Column-I		Column-II
$(a)$	Saprophyte	$(i)$	Symbiotic association of fungi with plant roots
$(b)$	Parasite	$(i i)$	Decomposition of dead organic materials
$(c)$	Lichens	$(i i i)$	Living on living plants
$(d)$	Mycorrhiza	$(i v)$	Symbiotic association of algae and fungi

Choose the correct answer from the options given below:

EASY

Biology>Ecology>Organisms and Populations>Population

In the following equation of Verhulst - Pearl logistic growth, the letter $' r'$ denotes ___ .

$\frac{dN}{dt} = rN (\frac{K - N}{K})$

MEDIUM

Biology>Ecology>Organisms and Populations>Population

Gause's competitive exclusion principle states that the two species cannot co-exist indefinitely and the competitively superior species will eventually eliminate the other species Which of the following statements are correct regarding validity of the Gause's principle.

A)

If resources are limited

B)

If two species occupy different niches

C)

If resource partitioning takes place between two species

D)

If two species occupy identical niche

EASY

Biology>Ecology>Organisms and Populations>Population

The following equation describes the exponential growth of a population

EASY

Biology>Ecology>Organisms and Populations>Population

If '

+

' sign is assigned to beneficial interaction, '

-

' sign to detrimental and '

0

' sign to neutral interaction, then the population interaction represented by '+' '-' refers to

MEDIUM

Biology>Ecology>Organisms and Populations>Population

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as

d N / d t = r N (1 - N / K) :

HARD

Biology>Ecology>Organisms and Populations>Population

A food chain always starts with_____

All the following are examples of commensalism except:

Important Questions on Organisms and Populations

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