MDCAT Biology Online Test With Answers

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MDCAT Biology Online Test

Sr. # Questions Answers Choice
1 When bacteria in soil oxidize ammonia or ammonium ions this is called: Oxidation Denitrification  Ammonification Nitrification 
2 Much of nitrogen found in the soil is the result of: Degeneration  Decomposition  Denitrification Assimilation 
3 Iron, iodine and zinc required by the organisms are said to the: Macronutrients Micronutrients  Moderate nutrients Assimilation 
4 Macronutrients are required by the organisms in: Small amount Large amount Traces Never required 
5 Due to the trampling of the soil layer by the hooves of grazing animals the rain water will: Penetrate deep into the soil Not penetrate this soil Stop on the soil Do not affect this layer of  the soil
6 The land will be turned to barren land if there is: Little grazing Moderate grazing  Over grazing None grazing
7 The attachment of shark and small fish remoras is an example of: Mutualism Parasitism Predation Commensalism 
8 The relationships between insects and flowering plants is an example of: Parasitism Predation Mutualism None of these
9 The root nodules bacteria fix ______ in sil air: Parasitism Carbon dioxide  Nitrogen Hydrogen 
10 In case of symbiosis ___________ is benefited. Host Parasite  Both host and parasite  None of these
11 Parasites which live inside the host body is called: Ectoparasite  Endoparasite  Intestinal parasite Muscular parasite 
12 As the number of the predators decreases the numbering of prey: Decreases Increases Remain constant  Sometime increases sometime decrease
13 Herbaceous stage in xerosere is the __________: First stage  Third stage Fourth stage  Last stage 
14 Xerosere starts with __________ stage. Crustose lichen Foliose lichen Mass Shrub
15 Plants like cacti store their water in large: Collenchyma tissues Mesenchymal tissues Parenchyma tissues Epidermal tissues 
16 Plants growing on dry habitat is called: Hydrophytes Mesophytes  Xerophytes  None of these above 
17 When succession starts on dry soil or rocks it is called: Hydrosere  Derosere Xerosere lithosere
18 In each case succession begins with few hard invaders called: Producers Consumers  Pioneers Beginners
19 The fourth trophic level includes the: Producers Tertiary consumers  Secondary consumers None of these 
20 The second trophic level includes the: Producers  Tertiary consumers  Secondary consumers  Primary consumers 
21 All food chain and food web begin with: Producers Consumers Decomposers Prey
22 Fungi and bacteria are: Producers Consumers Decomposers  Predators
23 Heterotrophic organisms are basically: Producers Consumers Producer and consumers None of these
24 Green, plants are basically: Producers Consumers Decomposers None of these
25 Any ecosystem is made up of three components like: Producers, consumers, and predators Producers, consumers and grazers Producers, consumers and decomposers Producers, grazers and composers
26 A biotic components includes the components like: Air, water, and animals Air, soil and plants Air, water and soil, air, soil, and, animals
27 Biotic components includes all the Nonliving components Living components Nonliving and living both None of these
28 Biosphere is spread over the surface of plant earth, extending upto: 8 to 10 km 5 to 6 km 10 to 20 km 8 to 16 km
29 The study of different communities to environment is called Autecology Synecology Microbiology Ornithology
30 When we study a single population relationship to its environment it will be called: Mycology Synecology Autecology Ornithology
31 Joseph Grinnell an American scientist was: Paleontologist Embryologist Ornithologist All of these
32 The actual location of place where an organisms live is called its: Ecosystem Habitat Niche Biome
33 A thin layer of earth in which all living organisms live is called: Biosphere Habitat Niche Hydrosphere
34 A group of interbreeding individual occurring in space and times is called: Community Population Generation Kingdom
35 The study of the relationship of animals to environment is called: Biology Ecology Microbiology Zoology
36 The major unit of ecology is: Biosphere Ecosystem Community Population
37 The term ecology was first used by a ________ zoologist. American Canadian German Greece
38 Ecology is a ______ word. German British French Greek
39 The term niche in ecolgy was first proposed by: Charles Eton Ernst Haeckel Joseph Grinnell Carolus Linnaeus
40 A short food chain of two or three links supports a community: Efficiently More efficiently Inefficiently Less efficiently
41 Biosphere is spread out over the surface of planet earth extending about: 2/4 km 4/6 km 6/8 km 8/10 km
42 A collection of related parts that function as a unit is called: Organ Organism System Individual
43 The relationship between insects and flowering plants is the example of: Commensalism Mutualism Predation Parasitism
44 The solar energy used to evaporate water, heat up soil and then lost to the outer space is: 99% 77% 55% 33%
45 The total energy from the sun is trapped by the producers in an ecosystem is about: 20% 10% 5% 1%
46 The amount of energy left after plants have met their respiratory needs is net primary production, which shows up as plant: Respiration Photosynthesis Biomass Reserve
47 Several bacteria in soil are able to oxidize ammonia or ammonium ions, this oxidation is known as: Ammonification Nitrification Denitrification Amino-oxidation
48 Three principal stages of nitrogen cycle are: Ammonification, Nitrification, and Assimilation Ammonification, Acidification, and Assilimlation Esterification, Nitrification, and Assimilation Ammonification, Nitrification, and Denitrification
49 Nitrogen makes up 78 percent of the gases in: Biosphere Ecosphere Lithosphere Atmosphere
50 The nutrient cycles are also called: Biochemical cycles Geochemical cycles Biogeochemical cycles Elemental cycles
51 Nutrients required by organisms in small quantity or in trace amount like zinc, molybdenum, iron, iodine are: Macronutrients Micronutrients Mega Nutrients Both a & c
52 Nutrients required by organism in large amount like water, carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur and  calcium are: Macronutrients Micronutrients Mega Nutrients Both a & c
53 The chemical elements essential for life in living organisms are called: Biogenic elements Nutrient elements Both a & b Genetic elements
54 Over grazing may lead to: Tundra Taiga Grassland Desert
55 The animals which feed on grasses are called: Grassers Browsers Grazers Grazophytes
56 The relationship in which only one organism benefit from the relationship. The other is not affected at all. Parasitism Commensalism Predation Mutualism
57 Lichens are dual organisms composed of symbiotic association of algae living within a fungus: Mycelium Sporangium Hyphae Rhizophore
58 An association between certain fungi and the roots of plants growing in acid soil is: Lichens Predation Mycorrhiza Commensalism
59 The legume plants, Pea and been are the hosts to symbiont bacteria which inhabit the roots forming root: Galls Nodules Stones Papillae
60 The symbiotic relationship in which both the partners get benefit is: Parasitism Commensalism Predation Mutualism
61 An association between two organisms, which brings benefit to both the organisms is called: Parasitism Commensalisms Predation Symbiosis
62 Parasites that live inside the body of the host: Endoparasites Ectoparasites Mesoparasites Both a & c
63 The parasites that live outside the body of the host are called: Endoparasites Ectoparasites Heteroparasites Both a & c
64 Diseases in living organisms caused by parasites are called: Infestations Plaques Influxes Swarms
65 Parasitism is an association between a host and a parasite, which ivolves providing the parasite with: Food Protection Conditions for its survival All a, b, c
66 Predator-prey relationship has a significant influence on: Distribution of organisms Abundance of organisms Both a & b Non-availability of organisms
67 The animal that is caught and eaten is called: Prey Host Victim Quarry
68 An animal that preys other animals is called: Predator Parasite Scavenger Detritivore
69 Crustose refers to: Aquatic lifeless structure Aquatic lively structure Land lively structure Land lifeless structure
70 Plants growing in xeric (dry) condition are called: Hydrophytes Xerophytes Mesophytes Derophytes
71 Primary succession that starts on a dry habitat is called: Hydrosere Derosere Xerosere Aquasere
72 Primary succession that starts on a dry soil or rock is called: Hydrosere Derosere Xerosere Aquasere
73 Primary succession that starts in a pond is called: Hydrosere Derosere Xerosere Aquasure
74 Succession ends with a diverse and relatively stable: Xerosere Derosere Pioneers Climax community
75 Succession begins by a few hardy invaders called: Founders Initiators Pioneers Leaders
76 A change in the community structure of an ecosystem over a period of time is: Progression Sequence Succession String
77 Basically, all animals depend on plants for their: Living Food Life Respiration
78 The fungi and bacteria, which obtain their energy from the dead and decaying plants and animals are: Decomposers Consumers Producers Scanvengers
79 All the organisms, primarily animals, which obtain energy directly or indirectly from the produces as ready-organic food are: Decomposers Consumers Detritivores Scavengers
80 The green photosynthetic plants, which capture and bring light energy into the ecosystem are: Decomposers Consumers Producers Scanvengers
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