Organisms and Populations MCQ Questions & Answers in Botany

1. Vivipary is characteristic of

A mesophytes

B xerophytes

C hygrophytes

D halophytes

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2. Between which among the following, the relationship is not an example of commensalism?

A Female wasp and fig species

B Orchid and the tree on which it grows

C Cattle egret and grazing cattle

D Sea anemone and clown fish

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3. Keystone species in an ecosystem are those

A present in maximum number

B that are most frequent

C attaining a large biomass

D contributing to ecosystem properties

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4. What is a keystone species?

A 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

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

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

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

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5. Asymptote in a logistic growth curve is obtained when :

A $$K = N$$

B $$K > N$$

C $$K < N$$

D The value of $$'r'$$ approaches zero

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6. Praying mantis is a good example of

A warning colouration

B social insects

C camouflage

D mullerian mimicry

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7. All of the following statements concerning the Actinomycetes filamentous soil bacterium Frankia are correct except that Frankia :

A Can induce root nodules on many plant species

B Cannot fix nitrogen in the free-living state

C Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids

D Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex

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8. Cuscuta is an example of

A ectoparasitism

B brood parasitism

C predation

D endoparasitism

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9. Gause's principle of competitive exclusion states that :

A more abundant species will exclude the less abundant species through competition

B competition for the same resources excludes species having different food preferences

C no two species can occupy the same niche indefinitely for the same limiting resources

D larger organisms exclude smaller ones through competition

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10. In which of the following interactions both partners are adversely affected ?

A Predation

B Parasitism

C Mutualism

D Competition

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1 2 3 4 5 6 7 8 9

1. Vivipary is characteristic of

2. Between which among the following, the relationship is not an example of commensalism?

3. Keystone species in an ecosystem are those

4. What is a keystone species?

5. Asymptote in a logistic growth curve is obtained when :

6. Praying mantis is a good example of

7. All of the following statements concerning the Actinomycetes filamentous soil bacterium Frankia are correct except that Frankia :

8. Cuscuta is an example of

9. Gause's principle of competitive exclusion states that :

10. In which of the following interactions both partners are adversely affected ?

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