Population Interactions

Q.

A bird enters the mouth of a crocodile and feeds on parasitic leeches. The bird gets food and crocodile gets rid of the blood sucking leeches. Both the partners can live independently. Such an association is:

1. Mutualism
2. Amensalism
3. Commensalism
4. Protocooperation

Q.

The relation with two organisms in which one organism hunts and kills the other for food is called

1. Symbiosis

2. Predation

3. Parasitism

4. Nitrogen fixation

Q. Explain the concept of interdependence between organisms in an ecosystem using specific examples.

Q.

The function or position of a species within an ecological community is

1. niche
2. ecotone
3. ecotype
4. biome

Q.

Do Fish eat Lichen?

Q. Match the organisms with the type of interaction they represent.

1. Mutualism
2. Predation
3. Parasitism

Q.

What do you mean by:-
(i) Species
(ii) Endangered species [2 MARKS]

Q.

A group of similar individuals living in a given area with the potential to interbreed in nature contitute a:

1. groups

2. community

3. population

4. species

Q.

Are diatoms used for pest control?

Q.

An interaction favourable to both populations but not obligatory to either is

1. proto co-operation
2. mutualism
3. commensalism
4. parasite

Q.

Choose the most appropriate explanation for ecological succession.

1. The replacement of closely related species at successive altitudes up a mountain.
2. The successive colonization of a site by certain species accompanied by the extinction of others.
3. The synchronous ageing of a cohort of animals born at the same time.
4. The successive links in a food chain from plants to herbivores to carnivores.

Q.

Populations of insects and green plants in a particular region is always balanced. This balance and equilibrium is achieved by various processes in ___.

1. Microbial community

2. Plant community

3. Insect community

4. Ecosystem

Q. Differentiate between parasitism and competition, giving one example of each. State the common characteristics they share.

Q. In parasitism, both the host as well as the parasite is benefited.

1. False
2. True

Q. Energy is always transferred from the prey to the predator.

1. False
2. True

Q.

Predation and parasitism are which type of interactions

1. a.+, +

2. -, -

3. +, 0

4. +, -

Q.

All the members of a single species occupying a particular area at a particular time constitute the ___

1. Neighbourhood
2. Community
3. Gene pool
4. Population

Q. Match the Column I with the Column II and choose the correct option

1. e
2. f
3. g
4. h