Population interactions: mutualism, competition, predation, parasitism
- Given below are two statements :Statement I : Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.Statement II : Fig wasp and fig tree exhibit mutual relationship as fig wasp completes its life cycle in fig fruit and fig fruit gets… Answer: 2. Both statement I and statement II are incorrect Key idea: Both statements fail when read strictly. Statement I is incorrect. A fi... 1
- Epiphytes that are growing on a mango branch is an example of which of the following? Answer: 1. Commensalism Key idea: Commensalism is an interaction where one species benefits and the other is neither harmed nor helped. An e... 1
- Given below are two statements :Statement I : Gause's competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely.Statement II : According to Gause's principle, during competitio… Answer: 1. Statement I is false but Statement II is true. Statement I is false. Gause's principle says two closely related species competing... 1
- Match List I with List II :List I (Interaction) | List II (Species A and B)A. Mutualism | I. +(A), O(B)B. Commensalism | II. -(A), O(B)C. Amensalism | III. +(A), -(B)D. Parasitism | IV. +(A), +(B)Choose the correct answer from the options given below… Answer: 3. A-IV, B-I, C-II, D-III Key idea: Use the signs for effect on species A and B. Mutualism: +, + (IV). Commensalism: + for A, 0 for... 1
- Given below are two statements :Statement I : Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually… Answer: 4. Statement I is correct but Statement II is false. Key idea: Statement I is Gause's principle, which is correct. Statement II is f... 1
- Match List I with List II.List I (Interacting species): A. A Leopard and a Lion in a forest/grassland; B. A Cuckoo laying egg in a Crow's nest; C. Fungi and root of a higher plant in Mycorrtizae; D. A cattle egret and a Cattle in a fieldList II (Name… Answer: 2. A-I, B-II, C-III, D-IV Key idea: Identify the type of interaction in each case. Leopard and lion share prey: competition (I). Cuc... 1
- 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 o… Answer: 2. Predation Predation is (+) for the predator and (-) for the prey. Competition is (-,-), amensalism is (-,0) and commensalism is (... 1
- Which one of the following statements cannot be connected to Predation ? Answer: 4. Both the interacting species are negatively impacted In predation, one species (predator) benefits (+) and the other (prey) is ha... 1
- Match List - I with List - II.List - I / List - II(a) Allen's Rule (i) Kangaroo rat(b) Physiological adaptation (ii) Desert lizard(c) Behavioural adaptation (iii) Marine fish at depth(d) Biochemical adaptation (iv) Polar sealChoose the correct answer… Answer: 3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Allen's rule (shorter extremities in colder climates) - polar seal (iv) Physiological adap... 1
- Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival ? Answer: 1. Resource partitioning When two species compete for the same resource, they may evolve ways to share it. This is resource partitio... 1
- Amensalism can be represented as : Answer: 1. Species A ( - ) ; Species B (0) Amensalism is an interaction in which one species is harmed and the other is unaffected. So it is... 1
- Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other ? Answer: 3. *Yucca* Yucca and the moth Pronuba are an obligate mutualism; the moth pollinates the flower and lays eggs in the ovary. Neither... 1
- Niche is Answer: 4. the functional role played by the organism where it lives Niche is the functional role of an organism in its habitat, including i... 1
- Mycorrhizae are the example of : Answer: 3. Mutualism Mycorrhizae are associations between fungi and roots of higher plants, and both partners benefit. The fungus absorbs ph... 1
- The principle of competitive exclusion was stated by Answer: 1. G. F. Gause The competitive exclusion principle was stated by G. F. Gause. It says two closely related species competing for the... 1
- If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to Answer: 3. parasitism In parasitism the parasite benefits (+) and the host is harmed (−). Amensalism: 0, − Commensalism: +, 0 Mutualism: +,... 1
- Gause's principle of competitive exclusion states that : Answer: 3. No two species can occupy the same niche indefinitely for the same limiting resources. Key idea: Gause's principle says that two... 1