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)

EASY

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Penicillium does not allow the growth of Staphylococcus bacterium. This type of biotic interaction is called

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Important Questions on Organisms and Populations

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

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:

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.

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

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

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

Which of the following statements is incorrect?

EASY

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

Relate Column I with Column II with regard to predatory behaviour

	Column-I		Column-I
$1 .$	Calotropis	p.	Invertebrates
$2 .$	Pisaster	q.	Distasteful
$3 .$	Monarch butterfly	r.	Cryptically coloured
$4 .$	Frogs	s.	Cardioglycoside

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.

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