Ecology and Environment (NEET Biology): Questions 56 - 59 of 227

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Question number: 56

» Ecology and Environment » Ecosystem » Nutrient Cycling

MCQ▾

Question

Azotobacter and Clostridium are nitrogen fixing bacteria and found in

Choices

Choice (4) Response

a.

Free in soil

b.

Nodulated roots

c.

Leaves of certain plant

d.

Question does not provide sufficient data or is vague

Question number: 57

» Ecology and Environment » Ecosystem » Patterns, Components

MCQ▾

Question

Which of the following statements is incorrect?

Choices

Choice (4) Response

a.

Those epiphytes which use other plants for support only and not for water or food supply are examples of commensation.

b.

Lichen, an association of fungus and algae is an example of mutualism.

c.

Sea-anemone on hermit-crab is an example of protocooperation.

d.

Mutualism, protocooperation, commensalisms cannot be included under symbiosis.

Question number: 58

» Ecology and Environment » Organisms and Environment » Population and Ecological Adaptations

MCQ▾

Question

What is a keystone species?

Choices

Choice (4) Response

a.

A common species that has plenty of biomass, yet has a fairly low impact on the community’s organization.

b.

A rare species that has minimal impact on the biomass and on other species in the community.

c.

A dominant species that constitutes a large proportion of the biomass and which affects many other species.

d.

A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community’s organization and survival.

Question number: 59

» Ecology and Environment » Ecosystem » Productivity and Decomposition

MCQ▾

Question

Dynamic aspect of an ecosystem is

Choices

Choice (4) Response

a.

Consumer and mineral cycles.

b.

Producer and energy flow.

c.

Energy flow and mineral cycles.

d.

Producer and mineral cycles.

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