12th class (Fsc) Biology unit 11 MCQs
26. The stage in which lichens are just line crumpled leaves attached to one point:
a. Foliage lichen stage
b. Moss stage
c. Shrub stage
d. Crustose lichen stage
27. In each case succession in initiated by a few hardy invaders called:
a. Climax community
b. Starters
c. Decomposers
d. Pioneers
28. Primary succession may start in a dry soil or rock is called:
a. Desert
b. Hydrosere
c. Derosere
d. Xerosere
29. The living organisms which can prepare their own food are:
a. Producers
b. Predators
c. Prey
d. Parasites
30. Lichens are example of:
a. Predation
b. Parasitism
c. Commensalism
d. Mutualism
31. The relationship between insects and flowering plants is an example of:
a. Mutualism
b. Parasitism
c. Commensalism
d. Predation
32. If population of predator increase then population of prey:
a. May increase
b. Increase
c. Has no effect or decrease
d. Decrease
33. The animal that is caught and eaten is called:
a. Host
b. Predators
c. Parasite
d. Prey
34. The remoras benefits from this relationship the shark is not affected at all:
a. Mutualism
b. Symbiosis
c. Commensalism
d. Mycorrhiza
35. Symbiotic association of an alga living within fungus mycelium is known as:
a. Root nodules
b. Mycorrhiza
c. Parasitism
d. Lichen
36. Moderate grazing is very helpful to maintain ecosystem:
a. Pond
b. Tundra
c. Desert
d. Grass land
37. Disease in living organisms caused by parasites are called:
a. Disinfestation
b. Infestation
c. Ectoparasites
d. Endoparasites
38. One of the following is an example of predator:
a. Fox and rabbit
b. Fungus and alga
c. Root nodule bacteria
d. Flower and insect
39. The bacteria in the root nodules fit nitrogen and convert it into:
a. Amino acids
b. Nitrate
c. Ammonia
d. Nitrite
40. An association between organisms of different species in which one partner gets benefits and other is harmed:
a. Parasitism
b. Mutualism
c. Commensalism
d. Symbiosis
41. And association between two organisms by which both are benefited is called:
a. Predation
b. Parasitism
c. Mutualism
d. Commensalism
42. Soil erosion, fire and water percolation down through the soil cause loss of:
a. Nitrates
b. Sulphates
c. Phosphates
d. Carbonates
43. When bacteria in soil oxidize ammonia or ammonium ion is called:
a. Ammonification
b. Oxidation
c. Nitrification
d. Deintrification
44. The process in which microorganisms use the proteins and amino acids and release ammonia or ammonium ions is known as:
a. Deintrification
b. Nitrification
c. Assimilation
d. Ammonification
45. The total energy of the sun trapped by the producer in an ecosystem is about:
a. 05%
b. 20%
c. 01%
d. 10%
46. Energy from sun flows through an ecosystem in the form of:
a. Temperature
b. Light
c. Evaporation
d. Radiant heat
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