Organisms and Populations

Choose the correct statements regarding population interactions between two species. Choose the correct answer from the options given below :

1. A and B only
2. B and E only
3. B, D and E only
4. A and D only

Which one of the following is an appropriate example of sexual deceit?

1. Sea anemone and clown fish
2. Ophrys and bumblebee
3. Female wasp and fig
4. Cuckoo and crow

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

1. A is not correct but R is correct
2. Both A and R are correct and R is the correct explanation of A
3. Both A and R are correct but R is not the correct explanation of A
4. A is correct but R is not correct

Match List-I with List-II.

1. A-III, B-I, C-II, D-IV
2. A-III, B-IV, C-II, D-I
3. A-I, B-II, C-III, D-IV
4. A-II, B-I, C-IV, D-III

Epiphytes that are growing on a mango branch are an example of which of the following?

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

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below:

1. Statement I is correct but statement II is incorrect
2. Statement I is incorrect but statement II is correct
3. Both statement I and statement II are correct
4. Both statement I and statement II are incorrect

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are true.
2. Both Statement I and Statement II are false.
3. Statement I is true but Statement II is false.
4. Statement I is false but Statement II is true.

Match List-I with List-II: Choose the correct answer from the options given below:

1. A-III, B-II, C-I, D-IV
2. A-IV, B-I, C-II, D-III
3. A-II, B-III, C-I, D-IV
4. A-II, B-III, C-IV, D-I

Match List-I with List-II. Choose the correct answer from the options given below:

1. A-I, B-IV, C-III, D-II
2. A-IV, B-I, C-II, D-III
3. A-III, B-I, C-II, D-IV
4. A-II, B-IV, C-III, D-I

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

1. Both Statement I and Statement II are false.
2. Statement I is correct but Statement II is false.
3. Statement I is incorrect but Statement II is true.
4. Both Statement I and Statement II are true.

Match List I with List II: Choose the correct answer from the options given below:

1. A-IV, B-I, C-II, D-III
2. A-IV, B-III, C-I, D-II
3. A-III, B-I, C-IV, D-II
4. A-IV, B-II, C-I, D-III

Match List I with List II. Choose the correct answer from the options given below.

1. A-I, B-II, C-IV, D-III
2. A-III, B-IV, C-I, D-II
3. A-II, B-III, C-I, D-IV
4. A-I, B-II, C-III, D-IV

Which one of the following statements cannot be connected to Predation?

1. It helps in maintaining species diversity in a community
2. It might lead to extinction of a species
3. Both the interacting species are negatively impacted
4. It is necessitated by nature to maintain the ecological balance

While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (−) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (−) for another species involved in the interaction?

1. Predation
2. Amensalism
3. Commensalism
4. Competition

Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together, they may avoid competition in the same garden by :

1. Predating on each other
2. Feeding at the same time
3. Choosing different foraging patterns
4. Increasing time spent on attacking each other

In spite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

1. Predation
2. Resource partitioning
3. Competitive release
4. Mutualism

Amensalism can be represented as :

1. Species A (+); Species B (0)
2. Species A (-); Species B (0)
3. Species A (+); Species B (+)
4. Species A (-); Species B (-)

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

1. Nutritive value
2. Growth response
3. Effect on reproduction
4. Defence action

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

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

Mycorrhizae are the example of :

1. Fungistasis
2. Antibiosis
3. Mutualism
4. Amensalism

Gause's principle of competitive exclusion states that -

1. Larger organisms exclude smaller ones through competition
2. More abundant species will exclude the less abundant species through competition
3. Competition for the same resources excludes species having different food preferences
4. No two species can occupy the same niche indefinitely for the same limiting resources

If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to

1. parasitism
2. commensalism
3. mutualism
4. amensalism

The principle of competitive exclusion was stated by

1. MacArthur
2. G. F. Gause
3. Verhulst & Pearl
4. C. Darwin

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

1. Competition
2. Predation
3. Mutualism
4. Parasitism

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: [figure]

1. Population B competed more successfully for food than population A
2. Population A consumed the members of population B
3. Both plant populations in this habitat decreased
4. Population A produced more offspring than population B

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

1. Commensalism
2. Amensalism
3. Ectoparasitism
4. Symbiosis

Which one of the following is not a parasitic adaptation ?

1. Loss of digestive organs
2. Loss of unnecessary sense organs
3. Development of adhesive organs
4. Loss of reproductive capacity

Cuscuta is an example of :

1. Ectoparasitism
2. Predation
3. Endoparasitism
4. Brood parasitism

Which one of the following is categorised as a parasite in true sense?

1. The female Anopheles bites and sucks blood from humans
2. Head louse living on the human scalp as well as laying eggs on human hair
3. The cuckoo (koel) lays its eggs in crow's nest
4. Human foetus developing inside the uterus draws nourishment from the mother

Which one of the following is most appropriately defined?

1. Parasite is an organism which always lives inside the body of other organism and may kill it.
2. Host is an organism which provides food to another organism.
3. Amensalism is a relationship in which one species is benefited whereas the other is unaffected
4. Predator is an organism that catches and kills other organism for food.