1. Match the following. Population Interaction
(b) 1-D, 2-C, 3-B, 4-A (d) 1-C, 2-D, 3-B, 4-A
2. Which of the following statements is false regarding predators?
(a) Predators keep prey populations under control.
(b) Predators help in maintaining species diversity in a community.
(c) If a predator is not efficient, then the prey population would become extinct.
(d) Herbivores (predators) have a greater advantage since the plants cannot run away to avoid predation.
3. Barnacles growing on the back of whale is an example of
(a) mutualism (b) commensalism
(c) parasitism (d) amensalism.
4. Match the following and choose the correct combination from the options given below.
(a) A-1, B -5, C-4, D-3, E-2
(b) A-2, B-1, C-5, D-4, E-3
(c) A-4, B-3, C-2, D-1, E-5
(d) A-5, B-4, C-1, D-2, E-3
5. An example of endomycorrhiza is
(a) Nostoc (b) Glomus
(c) Agaricus (d) Rhizobium.
6. Which one of the following is not a parasitic adaptation?
(a) Development of adhesive organs
(b) Loss of digestive organs
(c) Loss of reproductive capacity
(d) Loss of unnecessary sense organs
7. Which of the following statements is incorrect?
(a) Lichen, an association of fungus and algae is an example of mutualism.
(b) Those epiphytes which use other plants for support only and not for water or food supply are examples of commensalism.
(c) Sea anemone on hermit crab is an example of proto-cooperation.
(d) Mutualism, proto-cooperation, commensalism cannot be included under symbiosis.
8. Match Column-I with Column-ll and select the correct option from the codes given below.
(a) A-(ii), B-(iv), C-(i), D-(v)
(b) A-(iv), B-(ii), C-(v), D-(i)
(c) A-(ii), B-(i), C-(v), D-(iv)
(d) A-(iii), B-(ii), C-(i), D-(iv)
9. Which out of the following is a partial stem parasite?
(a) Viscum (b) Cuscuta
(c) Santalum (d) Rafflesia
10. Which one of the following is most appropriately defined?
(a) Host is an organism which provides food to another organism.
(b) Amensalism is a relationship in which one species is benefitted whereas the other is unaffected.
(c) Predator is an organism that catches and kills other organism for food.
(d) Parasite is an organism which always lives inside the body of other organism and may kill it.
12. When two similar species live in the same area, they may evolve to become more different in order to
(a) drive the other species to extinction
(b) reduce competition
(c) use up the other species’ resources
(d) reduce genetic variation.
13. Two species competing for the same resource can avoid competition by choosing different habits. This phenomenon is called_____and was supported by
(a) competitive exclusion, Gause
(b) competitive exclusion, Hardin
(c) resource partitioning, Gause
(d) resource partitioning, Mac Arthur
14. Most interacting populations are
(a) mutualistic (b) symbiotic
(c) co-evolved (d) parasitic.
15. According to the competitive exclusion principle, developed in 1934 by the Russian biologist G. F. Gause, two species cannot remain in the same community if they have the same
(a) taxonomy (b) niche
(c) habitat (d) food requirements.
16. Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition?
(a) Azotobacter (b) Aspergillus
(c) Glomus (d) Trichoderma
17. Parasitism is an interaction between two species in which
(a) both the species are harmed
(b) both the species are benefitted
(c) one species is benefitted and the other is neither benefitted nor harmed
(d) one species is benefitted and the other is harmed.
18. A phenomenon when parasite parasitizes is known as
(c) monoxenous parasitism
(d) polyxenous parasitism.
19. When both partners/components are affected negatively, the nature of interaction is
(a) commensalism (b) predation
(c) competition (d) amensalism.
20. An association between two individuals or populations where both are benefitted and where neither can survive without the other is
(a) commensalism (b) amensalism
(c) proto-cooperation (d) mutualism.
I. (a) 2. (c) 3. (b) 4. (d) 5. (b)
6. (c) 7. (d) 8. (a) 9. (a) 10. (c)
II. (b) 12. (b) 13. (d) 14. (c) 15. (b)
16. (c) 17. (d) 18. (a) 19. (c) 20. (d)