Environmental Scientist - TNPSC - Ecological Interactions MCQs

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     🌱 Ecological Interactions – MCQs


Answers are given below....

1. Which type of ecological interaction benefits both species involved?
A) Predation
B) Parasitism
C) Mutualism
D) Commensalism

2. In parasitism, the organism that is harmed is called the:
A) Predator
B) Host
C) Parasite
D) Vector

3. The interaction in which one organism benefits while the other is neither harmed nor benefited is called:
A) Mutualism
B) Amensalism
C) Commensalism
D) Competition

4. Which of the following is an example of interspecific competition?
A) Lions competing with each other for mates
B) Trees shading out understory plants
C) Two bacteria cells dividing
D) An eagle preying on a rabbit

5. Which ecological interaction is detrimental to both species involved?
A) Predation
B) Mutualism
C) Competition
D) Commensalism

6. Mycorrhizal fungi associated with plant roots illustrate what type of interaction?
A) Parasitism
B) Mutualism
C) Predation
D) Amensalism

7. An orchid growing on a tree trunk without affecting the tree is an example of:
A) Commensalism
B) Parasitism
C) Predation
D) Mutualism

8. The predator-prey relationship regulates population size through:
A) Nutrient cycling
B) Co-evolution
C) Density-independent factors
D) Symbiosis

9. In amensalism, one species is harmed while the other:
A) Benefits
B) Is also harmed
C) Is unaffected
D) Becomes extinct

10. Which of the following is not a form of symbiosis?
A) Mutualism
B) Parasitism
C) Commensalism
D) Predation


ANSWERS


1. Which type of ecological interaction benefits both species involved?
A) Predation
B) Parasitism
C) Mutualism
D) Commensalism
✅ Answer: C) Mutualism

2. In parasitism, the organism that is harmed is called the:
A) Predator
B) Host
C) Parasite
D) Vector
✅ Answer: B) Host

3. The interaction in which one organism benefits while the other is neither harmed nor benefited is called:
A) Mutualism
B) Amensalism
C) Commensalism
D) Competition
✅ Answer: C) Commensalism

4. Which of the following is an example of interspecific competition?
A) Lions competing with each other for mates
B) Trees shading out understory plants
C) Two bacteria cells dividing
D) An eagle preying on a rabbit
✅ Answer: B) Trees shading out understory plants

5. Which ecological interaction is detrimental to both species involved?
A) Predation
B) Mutualism
C) Competition
D) Commensalism
✅ Answer: C) Competition

6. Mycorrhizal fungi associated with plant roots illustrate what type of interaction?
A) Parasitism
B) Mutualism
C) Predation
D) Amensalism
✅ Answer: B) Mutualism

7. An orchid growing on a tree trunk without affecting the tree is an example of:
A) Commensalism
B) Parasitism
C) Predation
D) Mutualism
✅ Answer: A) Commensalism

8. The predator-prey relationship regulates population size through:
A) Nutrient cycling
B) Co-evolution
C) Density-independent factors
D) Symbiosis
✅ Answer: B) Co-evolution

9. In amensalism, one species is harmed while the other:
A) Benefits
B) Is also harmed
C) Is unaffected
D) Becomes extinct
✅ Answer: C) Is unaffected

10. Which of the following is not a form of symbiosis?
A) Mutualism
B) Parasitism
C) Commensalism
D) Predation
✅ Answer: D) Predation

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