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

Match column-I with column-II and select the correct option. Column-I Column-II a) Commensalism i) Lichen b) Mutualism ii) Plasmodium c) Parasitism iii) Hawk d) Predation iv) Orchid

a)- iv), b)- i), c)- ii), d)- iii)

a)- i), b)- ii), c)- iii), d)- iv)

a)- iv), b)- iii), c)- ii), d)- i)

a)- ii), b)- iv), c)- i), d)- iii)

Match the following? The list I List II (i) Calotropis (a) Predator of Americana Pacific (ii) Cactus (b) Insects and frogs cryptically coloured (iii) Pisaster (c) Distasteful glycosides (iv) Monarch Butterfly (d) Cardiac glycosides (v) Camouflage (e) Predator is a moth

(i-d), (ii-e), (iii-a), (iv-c) and (v-b)

(i-c), (ii-e), (iii-a), (i -d) and (v-b)

(i-a), (ii-d), (iii-e), (i -c) and (v-b)

(i-e), (ii-d), (iii-c), (i -d) and (v-b)

EASY

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The interactions between species explains the conduit for energy transfer across trophic levels is

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Important Questions on Organisms and Populations

EASY

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

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

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

The interaction between "Cuckoo and Crow" is an example for

EASY

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

The function of aposematic colouration is to

HARD

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

In some species, individuals forego reproduction and help bring up another individual's offspring. Such altruistic behavior CANNOT be explained by which of the following?

EASY

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

From the given options, identify the correct combination of population interactions that correspond to the symbols given here.

HARD

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

Given the graphs below, the interaction between species $1$ and $2$ can be classified as

Question Image

MEDIUM

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

Study the following table and pick up the correct combinations.

S.No	Type of parasite	Lives in host	Example
I)	Cytozoic parasites	Live among cells of tissues of host	Plasmodium
II)	Histozoic parasites	Live within the host's cells	Wuchereria
III)	Coelozoic parasites	Live in cavities of host	Ascaris
IV)	Hyperparasites	Lives in the body of another parasite	Nosema

MEDIUM

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

The figure below demonstrates the growth curves of two organisms A and B growing in the same area. What kind of relation exists between A and B?

Question Image

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:

MEDIUM

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

Match column-I with column-II and select the correct option.

Column-I		Column-II
a)	Commensalism	i)	Lichen
b)	Mutualism	ii)	Plasmodium
c)	Parasitism	iii)	Hawk
d)	Predation	iv)	Orchid

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

EASY

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

Amensalism can be represented as:

MEDIUM

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

Assertion (A): The Monarch butterfly feeds on poisonous weeds during its caterpillar stage.

Reason (R): It helps butterfly to become distasteful to the predator.

EASY

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

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

MEDIUM

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

Study the following table and pick up the correct combinations.

S.No.	Interaction	Species A	Species B
I)	Mutualism	$+$	$+$
II)	Competition	$-$	$+$
III)	Predation	$+$	$-$
IV)	Parasitism	$-$	$-$
V)	Commensalism	$0$	$+$
VI)	Amensalism	$-$	$0$

EASY

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

Match the following?

The list I		List II
(i)	Calotropis	(a)	Predator of Americana Pacific
(ii)	Cactus	(b)	Insects and frogs cryptically coloured
(iii)	Pisaster	(c)	Distasteful glycosides
(iv)	Monarch Butterfly	(d)	Cardiac glycosides
(v)	Camouflage	(e)	Predator is a moth

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

The monarch butterfly avoids predators such as birds by:

HARD

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

Consider that plant species

P

is more efficient than plant species

Q

in nutrient uptake, but plant

Q

is a better seed disperser. In this example, the resource under competition is nutrient; but, nutrient acquisition is related to availability. If a disturbance opens up new space for colonization, plant

Q

is expected to arrive first and maintain its presence in the community until plant

P

arrives and begins competing with plant

Q

. Eventually, plant

P

will outcompete plant

Q

because plant

P

is more efficient in nutrient acquisition and grows faster. With an increasing plant

P

population, the plant

Q

population will decline, and given enough time, has a possibility of shrinking in number in the present habitat. The way(s) of preventing the declining numbers of plant

Q

could be

The interactions between species explains the conduit for energy transfer across trophic levels is

Important Questions on Organisms and Populations

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