Which of the following is a secondary treatment for the prevention of water pollution which involves allowing of water through a thick layer of stones or grave?
A. Sedimentation method
B. Trickling filter method
C. Floatation method
D. Screening method
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The radicle of the developing embryo is enveloped by a sheath called
A. Coleoptile
B. Scutellum
C. Coleorhiza
D. Mycorrhiza
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Which of the following substances are never found inside living cells, yet they are a major and characteristic component of all ecosystems?
A. Adenosine triphosphates
B. Deoxyribonucleic acids
C. Humic substances
D. Organic compounds
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Match
List-I with
List-II and select the correct answer:
List-I
List-II
a. Phytoedaphon
1. Plants growing on other plants
b. Endophytes
2. Annuals, including algae, fungi, liverworts, mosses, many ferns and seed plants
c. Epiphytes
3. Microscopic soil flora
d. Therophytes
4. Plants living wholly or partly within other plants, as algae in lichens, or parasites
A. a-2, b-3, c-1, d-4
B. a-3, b-4, c-1, d-2
C. a-3, b-2, c-4, d-1
D. a-2, b-1, c-4, d-3
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Coral reefs normally exist in water with mean temperature
A. 20.5° C
B. 10° C
C. 30.7° C
D. 0.4° C
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The symptoms of blast of rice are most prominent on
A. Leaves
B. Leaf sheaths
C. Rachis
D. Nodes
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The complete or partial inhibition or death of one organism by another through the production of some substances or environmental conditions as a result of metabolic pathways is known as
A. Symbiosis
B. Antibiosis
C. Partial parasitism
D. Antagonism
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Who among the following was the first man to see bacteria and yeast with the help of his crude simple microspore?
A. Aristotle
B. Theophrastus
C. Leeuwenhoek
D. Tillet
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Which of the following presents three assemblages of ecological types e.g., mesophytic, hydrophytic and semi-xerophytic?
A. Vegetation of the Gangetic plain
B. Vegetation of Sunderbans
C. Vegetation of Assam valley
D. Vegetation of Malabar
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What rays of sunlight are mostly utilized by chlorophyll in photosynthesis?
A. Red
B. Yellow
C. Green
D. Blue
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Which of the following is correct sequence of the events occurring during sexual reproduction in plants?
A. Seedling, Embryo formation, Pollination, Fertilisation, Division of zygote
B. Embryo formation, seedling, Pollination, Fertilisation, Division of zygote
C. Pollination, Fertilisation, Division of zygote, Embryo formation, Seedling
D. Seedling, Embryo formation, Division of zygote, Pollination, Fertilisation
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Air can hold maximum amount of water vapour at any temperature, and at that temperature the actual pressure of water vapour expressed by percentage of the maximum is called
A. Absolute humidity
B. Relative humidity
C. Normal humidity
D. None of the above
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Which of the following organisms break down the complex substances of dead tissues of producers and consumers and absorb some of the decomposition products and release simple substances usable by autotrophic organisms to start the food-chain cycle again?
A. Primary consumers
B. Quaternary consumers
C. Microconsumers
D. None of the above
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The enzyme carboxylase contains which of the following as co-enzyme and metal activator?
A. Adenine phosphate and iron respectively
B. Thiamin phosphate and iron respectively
C. Thiamin phosphate and magnesium respectively
D. Adenosine phosphate and magnesium respectively
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The cytomembrane of many photosynthetic bacteria are differentiated as independent vesicular structures known as
A. Lamellae
B. Chromatophores
C. Plasmodesmata
D. Aleurone grains
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K. I of Bajra is a highly resistant variety to
A. Smut disease
B. Root knot disease
C. Green ear disease
D. Black arm disease
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Consider the following statements.
1. Glycolysis occurs in cytoplasm.
2. Glycolysis does not require oxygen.
3. In anaerobic organisms, only glycolysis occur and that is called fermentation.
Which of the statement(s) given above is/are correct about glycolysis ?
A. Only 1
B. Only 2
C. 1, 2 and 3
D. None of these
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Which of the following full form of ATP is correct?
A. Adenosine Tetraphosphate
B. Adenine Tetraphosphate
C. Adenosine Triphosphate
D. None of the above
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The food conducting tissue of a plants is
A. phloem
B. xylem
C. parenchyma
D. collenchyma
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Which of the following is not a physically demarcated space, but an abstraction that includes all the physical, chemical, physiologic and biotic factors that an organism requires to live?
A. Habitat of an organism
B. Ecosystem in a pond
C. Ecological niche
D. All of the above
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