Ecology & Environment MCQs Part VII

1) Rotenone is a
a) Natural herbicide
b) Bioherbicide
c) Natural insecticide
d) Insect hormone

2) Pheromones are chemicals that are used in animals
a) As sex attractants
b) to send alarm signals
c) to mark trails
d) All the above

3) “DeVine” and “Collego” are two agricultural substances that are used as
a) Biofertilizers
b) Natural insecticides
c) Insect hormones
d) Bioherbicides

4) The first bioherbicide developed in 1981 was based on
a) Phytophthora palmivora
b) Phytophthora infestans
c) Bacillus thuringiensis
d) Azadirachta indica

5) Biopesticides include
a) Bioherbicides
b) Bioinsecticides
c) Bioherbicides and bioinsecticides
d) Bioherbicides, bioinsecticides and biofertilizers

6) Biopesticides have been recommended
a) Because of their cheapness
b) Because of their abundance
c) To prevent ecodegradation
d) Because of their ready availability

7) Sporeine is based upon
a) Spores of algae
b) Spores of fungi
c) Bacteria
d) Viruses

8) Sporeine was developed in
a) France
b) Germany
c) USA
d) Italy

9) The confusion technique involves
a) Confusing insects by releasing sterile males
b) Laying traps containing pheromones
c) dropping hydrophobic paper containing pheromones
d) Introducing juvenile hormones at inappropriate stages

10) The first bioherbicide was a
a) Phycoherbicide
b) Mycoherbicide
c) Nematoherbicide
d) Bacterioherbicide

11) Integrated pest management excludes
a) Biological methods
b) Mechanical methods
c) Chemical pesticides
d) None of these

12) Which of the following is an organochlorine ?
a) Aldrine
b) D.D.T
c) Malathion
d) Parathion

13) Insecticides kill
a) Only specific insects
b) Only plant pests
c) Harmful insects
d) Both harmful and useful insects

14) An important ingredient of Finit is
a) B.H.C
b) Parathion
c) Malathion
d) Fernethion

15) The common mode of action of most insecticides is through attaching to the
a) Nervous system
b) Circulatory system
c) Respiratory system
d) Muscular system

16) Which of the following pesticides are lipophilic ?
a) pyrethroids
b) Organochlorines
c) Organophosphates
d) all the above

17) Methyl isocyanate gas is used for preparing
a) Aldrin
b) Methyl carbaryl
c) Flit
d) D.D.T

18) Pyrethrin is obtained from
a) Azadirachta indica
b) Helianthus annuus
c) Chrysanthemum cinerarifolium
d) None of these

19) Which of the following compounds extracted from the neem tree keeps away insects?
a) Azadirachtin
b) Aldicarb
c) Phenyl carbamate
d) Pyrethoids

20) Sporeine kills insects by inhibiting ion transport in the
a) Digestive system
b) Fore gut
c) Mid gut
d) Hind gut

21) Sporeine is a
a) Mycoherbicide
b) Bioinsecticide
c) Herbicide
d) Pesticide

22) The first bioinsecticide developed on a commercial scale was
a) Sporeine
b) Morphine
c) Quinine
d) None of these

23) Which insect was used to check the spread of cacti bugs?
a) Coleus eurythaeum
b) Cactoblastis cactorum
c) Neodipreon certifer
d) None of these

24) The cochineal insect has been used in checking the growth of
a) Opuntia
b) Eichhornia
c) Aphids
d) Screw worm

25) VAM is a
a) Bioinsecticide
b) Bioherbicide
c) Endomycorrhiza
d) Ectomycorrhiza

26) A natural insecticide obtained from plants is
a) Azadirachtin
b) Rotenone
c) Nicotine, pyrethrum and cinerin
d) All the above

27) The pesticides with a very low biodegradation and strong affinity for fatty tissues are
a) Triazines
b) Organochlorines
c) Pyrethoids
d) Organophosphates

28) Bordeaux mixture was discovered by
a) De Bary
b) Millardet
c) Tillet
d) Leeuwenhoek

29) The pesticide used in treating the foundations of buildings for preventing termite infestation is
a) Aldrin
b) B.H.C
c) Endrin
d) D.D.T

30) One of the earliest pesticides employed by human beings was
a) D.D.T
b) Nicotine
c) Neem leaves
d) Pyrethrum

31) Which of the following ingredients of a pesticide killed hundreds of people in the Bhopal tragedy ?
a) Carbon tetrachloride
b) Methyl isocyanate
c) Mustard gas
d) Nitrous acid

32) Which of the following is a fungicide ?
a) 2, 4-D
b) D.D.T
c) Bordeaux mixture
d) BHC

33) 2-4 Dichlorophenoxy acetic acid is a
a) Flowering hormone
b) Herbicide
c) Pesticide
d) Rooting hormone

34) Endosulphan is a
a) Herbicide
b) Weedicide
c) Rodenticide
d) Pesticide

35) Green manuring increases the crop yield by
a) 5-10%
b) 15-25%
c) 30-50%
d) 80-90%

36) Farmyard manure consists of
a) Rotten vegetables and animal refuse
b) Cattle dung and crop residues
c) Both A and B
d) None of these

37) The nitrogen fixing symbiotic organism present in the leaves of Azolla is
a) Aulosira
b) Azotobacter
c) Clostridium
d) Anabaena

38) Nitrogen fixation by Rhizobium is increased in the presence of
a) Nitrogen
b) Phosphorus
c) Potassium
d) All of these

39) Mycorrhiza is a symbiotic association of
a) Algae and fungi
b) Bacteria and fungi
c) Fungi and the roots of higher plants
d) Blue-green algae and roots of higher plants

40) Which of the following is a green manure ?
a) Sesbania
b) Maize
c) Rice
d) Sorghum

41) Which of the following is most commonly used for green manuring in India?
a) Lentil
b) Cow pea
c) Sun hemp
d) All of these

42) Types of manures are
a) Green and farmyard
b) Green and composted
c) Farmyard and composted
d) Farmyard, composted and green

43) Composted manure is formed from
a) Farm refuse and household refuse
b) Rotted vegetables and animal refuse
c) Organic wastes from which biogas is extracted
d) Farmyard manure and green manure

44) Fertilizers applied to crop plants pollute
a) Water resources
b) Soil resources
c) Both water and soil resources
d) Soil, water and atmosphere

45) The material of biological origin used to improve and maintain soil fertility is
a) Biopesticide
b) Biofertilizer
c) Fertilizer
d) Bionutrient

46) The main sources of biofertilizers are
a) Cyanobacteria
b) Fungi
c) Bacteria
d) All of these

47) Biofertilizers include
a) Nitrogen fixing cyanobacteria
b) Nitrogen fixing bacteria
c) Both bacteria and cyanobacteria
d) Bacteria, cyanobacteria and mycorrhizal fungi

48) Which of the following is an important requirement for crop plants ?
a) Nitrogen
b) Iron
c) Zinc
d) None of these

49) The percentage of nitrogen content in urea is
a) 26%
b) 36%
c) 46%
d) 56%

50) Ectomycorrhiza absorbs and stores N, P, K and Ca in the
a) Root hairs
b) Fungal mantle
c) Host epidermis
d) Host cortex

51) A water fern used as a biofertilizer in rice fields is
a) Salvinia
b) Azolla
c) Dryopteris
d) Salvia

52) The chemical fertilizer required for better rhizobial nitrogen fixation is
a) Potassium
b) Sodium
c) Calcium
d) Phosphorus

53) Which nitrogen fixing bacterium forms a loose association with roots of grasses ?
a) Bacillus
b) Azotobacter
c) Azospirillum
d) Rhizobium

54) The leaves of Azolla house colonies of
a) Rhizobium
b) Azotobacter

c) Anabaena
d) Azospirillum

55) Biofertilisers are
a) Fertilisers obtained by decay of dead organisms
b) Fertilisers prepared by mixing cattle dung with crop wastes
c) Fertilisers formed by ploughing in barseem
d) Some bacteria, fungi and algae

56) The most quickly available source of nitrogen to plants is
a) Nitrate fertilisers
b) Ammonical fertiliser
c) Ammonical- nitrate fertiliser
d) Amide fertiliser

57) Vesicular arbuscular mycorrhizae (VAM) are important in
a) Nitrate nutrition of plants
b) Phosphate nutrition of plants
c) Carbonate nutrition of plants
d) Sulphate nutrition of plants

58) The best biofertiliser for rice is
a) Bacillus polymyxa
b) Azolla pinnata
c) Bacillus megatherium
d) Rhizobiurn melioti

59) Which of the following statements is incorrect?
a) Chemical fertilisers are costly
b) Fertilisers cause pollution of soil and water resources
c) Biofertilisers improve soil fertility
d) Chemical fertilisers do not cause land degradation

60) Straight fertilisers contain
a) One primary nutrient
b) Two primary nutrients
c) Three primary nutrients
d) Many primary nutrients

61) BGA is chiefly used as a bio-fertilizer in the crop of
a) Wheat
b) Gram
c) Paddy
d) Mustard

62) Genetic diversity means
a) Intergeneric variations
b) Intraspecific variations
c) Interspecific variations
d) Both B and C

63) In a gene bank, genetic material is stored in the form of
a) Seeds
b) Vegetative material
c) Both A and B
d) None of these

64) Potatoes and tomatoes are natives of
a) Canada
b) North America
c) China
d) South America

65) Ethiopia is the native place of
a) Cabbage
b) Rice
c) Coffee
d) Maize

66) South-east Asia is thought to be the centre of origin of
a) Rice, Sugarcane, Mango and Banana
b) Rice, Sugarcane and Mango
c) Rice and Sugarcane
d) None of these

67) Maize evolved in
a) South East Asia
b) Brazil
c) Mexico and Central America
d) Peruvian Andes

68) Genetic erosion is caused by
a) Adoption of genetically uniform varieties of crops
b) Shifting cultivation
c) Deforestation
d) All of these

69) One of the following is a gift of the new world to the old world:
a) Maize
b) Rice
c) Wheat
d) Barley

70) An orthodox seed can
a) Tolerate dehydration and freezing
b) Tolerate dehydration but not freezing
c) Tolerate freezing but not dehydration
d) None of these

71) A recalcitrant seed can
a) Bear dehydration but not low temperature
b) Not bear dehydration but can tolerate low temperature
c)
d) None of these

72) The native place of Hevea rubber is
a) South-east Asia
b) Brazil
c) Peruvian Andes
d) Malaysia

73) The famous cultivated plant which developed in China is
a) Orange
b) Tea
c) Coffee
d) Cotton

74) The Peruvian Andes is believed to be the centre of origin of
a) Potato
b) Tomato
c) Potato and tomato
d) Potato, tomato and chillies

75) Cabbage originated in the
a) Mediterranean region
b) Peruvian Andes
c) South-west Asia
d) Mexico and central America

76) One of the plants introduced from the old world to the new world is
a) Potato
b) Rice
c) Sweet potato
d) Maize

77) The original home of rice is
a) Mediterranean region
b) South-west Asia
c) South-east Asia
d) China

78) The origin of the sunflower is believed to be in
a) Peruvian Andes
b) Mexico and Central America
c) Brazil
d) U.S.A

79) Which part of Cola nitida yields a beverage ?
a) Seeds
b) Leaves
c) Flower
d) Stem

80) Banana plants can be multiplied rapidly by adopting
a) Aerial grafting
b) Aerial stem cutting
c) Rhizome cutting
d) X-ray irradation of fruits

81) Which of these is a new crop ?
a) Soybean
b) Winged bean
c) Sugarbeet
d) Lentil

82) Hybrids are generally
a) Weak
b) Strong
c) Like the parents
d) Mutants

83) Prehistoric man
a) Did not cultivate crops at all
b) Cultivated crops on mountains
c) Cultivated crops near forests
d) Cultivated crops near rivers

84) Exploration of underutilised plants is being done to
a) Increase our knowledge
b) Conserve germ plasm
c) Increase our resource base
d) None of these

85) Which one of the following gases can deplete the ozone layer in the upper atmosphere?
a)

CH4

b)

CO

c)

NH3

d)

SO2

86) The sum of all the populations of the same kind of organisms forms a
a) Community
b) Species
c) Colony
d) Genus

87) Closely related, morphologically similar sympatric population, but reproductively isolated are designated as
a) Sibling species
b) Clines
c) Demes
d) Clones

88) The concentration of pesticide required to destroy 50% of pests is called
a) LD 50
b) LC 50
c) LB 50
d) LE 50

89) The major drawback of DDT as a pesticide is that
a) It is not readily and rapidly degraded in nature
b) Organisms at once develop resistance to it
c) It is significantly less effective than other pesticides
d) Its cost of production is high

90) Rotenone is
a) A natural herbicide
b) A bioherbicide
c) A natural insecticide
d) An insect hormone

91) The abundance of a species population within its habitat is called the
a) Regional density
b) Niche density
c) Absolute density
d) Relative density

92) Which of the following groups of plants are highly useful for increasing soil fertility?
a) Fungi
b) Bacteria
c) Bryophytes
d) Red algae

93) The four elements that make up 99% of all elements found in a living system are
a) H, O, C, N
b) C, H, O, S
c) C, H, O, P
d) C, N, O, P

94) In a terrestrial habitat which of the following factors affect temperature and rainfall conditions?
a) Translocation
b) Transpiration
c) Transformation
d) Thermodenaturation

95) Decomposers are organisms which
a) Operate in relay teams, simplifying step by step, the organic constituents of each dead body
b) Attack plants and animals and kill them
c) Operate in the living body and simplify step by step the organic constituents of each cell
d) Operate to make chemical substances resulting in dead tissue

96) Non-symbiotic nitrogen fixers are
a) Azotobacter
b) Blue-green algae
c) Soil fungi
d) Pseudomonas

97) The living organisms on or around the earth constitute the
a) Biome
b) Biosphere
c) Community
d) Biocoenosis

98) Which of the following contribute to the carbon cycle?
a) Respiration
b) Photosynthesis
c) Fossil fuel combustion
d) All of these

99) How do nitrogen-fixing bacteria contribute to the nitrogen cycle?
a) They withdraw nitrate from the soil
b) They change nitrogen to ammonia
c) They return nitrogen to the atmosphere
d) They change ammonia to nitrate

100) Soil conservation is the process whereby
a) Sterile soil is converted into fertile soil
b) Soil is aerated
c) Soil erosion is allowed
d) Soil is protected against loss

Answers

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