Organisms and Populations

Study the four statements (a–d) given below and select the two correct ones out of them – (a) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers (b) Predator starfish Pisaster helps in maintaining species diversity of some invertebrates (c) Predators ultimately lead to the extinction of prey species (d) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders The two correct statements are –

1. b and c
2. a and d
3. c and d
4. a and b

A high density of elephant population in an area can result in :-

1. Mutualism
2. Interspecific competition
3. Predation on one another
4. Intraspecific competition

Praying mantis is a good example of-

1. Warning colouration
2. Camouflage
3. Mullerian mimicry
4. Social insects

Niche overlap indicates-

1. Sharing of one or more resources between the two species
2. Mutualism between two species
3. Active cooperation between two species
4. Two different parasites on the same host

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

1. Poison fangs in snakes
2. Enlargement of body size by swallowing air in puffer fish
3. Colour change in chameleon
4. Melanism in moths

Mycorrhiza is an example of :-

1. Ectoparasitism
2. Decomposers
3. Endoparasitism
4. Symbiotic relationship

Cause of mimicry is -

1. offence
2. concealment
3. defence
4. both (2) and (3)

Which type of association is found in between entomophilous flower and pollinating agent ?

1. Cooperation
2. Co-evolution
3. Mutualism
4. Commensalism

Two different species can not live for long duration in the same niche or habitat. This law is : -

1. Dollo's rule
2. Weismann's theory
3. Allen's law
4. Gause's hypothesis