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

Earn 100

'Competitive release' refers to

50% studentsanswered this correctly

Important Questions on Organisms and Populations

HARD

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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 and Environment>Organisms and Populations>Population Interactions

The principle of competitive exclusion was stated by

HARD

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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 and Environment>Organisms and Populations>Population Interactions

Which of the following statements is incorrect?

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

The impact of immigration on population density is:

HARD

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

Asymptote is a logistic growth curve is obtained when

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

The following equation describes the exponential growth of a population

MEDIUM

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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.

Question Image

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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

HARD

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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.

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

Gause's principle of competitive exclusion states that:

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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

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

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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

EASY

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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

Question Image

MEDIUM

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

Read the following data carefully

Parameter	Values
Initial population of lions	$400$
Number of new births in one year	$100$
Number of deaths in one year	$40$

Imagine the lion population grows logistically where the carrying capacity is $800 .$ Then the per capita birth rate $(b)$ , per capita death rate $(d)$ , intrinsic rate of natural increase $(r)$ , increase or decrease in population during the unit time period $(\frac{d N}{d t})$ are respectively

MEDIUM

Biology>Ecology and Environment>Organisms and Populations>Population Interactions

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 and Environment>Organisms and Populations>Population Interactions

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 and Environment>Organisms and Populations>Population Interactions

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 and Environment>Organisms and Populations>Population Interactions

A food chain always starts with_____

'Competitive release' refers to

Important Questions on Organisms and Populations

Learn and Prepare for any exam you want !