1) Halophytes growing on mud are called: a. Pelophilous b. Heliophilous c. Psammophilous d. Lithophilous
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2) Plants growing in marsh are called: a. Halophytes b. Heliophytes c. Halophytes d. Sciophytes
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3) Mark the helophyte: a. Suaeda fruticosa b. Cressa cretica c. Salsola foetide d. All of these
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4) Plants growing on desert and steppe are called: a. Oxylophytes b. Lithophytes c. Eremophytes d. Psilophytes
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5) Plants growing on rocks are called on: a. Psychrophytes b. Lithophytes c. Halophytes d. Sciophytes
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6) Plants growing on externally cold soil are called: a. Halophyte b. Oxylophyte c. Psychrophyte d. Psammophyte
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7) The mangrove plants are generally characterised by: a. Mircophylly b. Pneumatophores and vivipary c. Absence of aerenchyma d. Poor water storage
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8) Mark the rooted submerged hydrophyte: a. Potamogeton b. Najas c. Ranunculus d. None of these
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9) The mesophytes are characterised by: a. Uniform mesophyll b. Absence of cuticle c. Well developed root-shoot systems d. All of these
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10) Plant groups growing in zones where high temperature alternates with low temperature are called: a. Megatherms b. Hekistotherms c. Microtherms d. Mesotherms
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11) In which of the following groups, all the plants belong to the same category? a. Nymphaea, Poamogeton, Victoria b. Utricularia, Typha, Aponogeton c. Lemna, Spirodela, Azolla d. Ranunculus, Vallisneria, Hydrilla
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12) The leaves are absent in the xerophyte: a. Calotropis procera b. Zizyphis jujuba c. Acacia nilotica d. Capparis aphylla
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13) Which of the following feature is found in xerophytes? a. Equally developed palisade and spongy parenchyma b. Multistratose epidermis c. Non-functional stomata d. None of these
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14) When a plant first begins to wilts permanently in a pot, its 54.5 gms of soil has 4.5 gms of wter. The PWP of this soil is: a. 4.50% b. 9% c. 8.25% d. 16.50%
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15) Euhalophytes grow where the concentration of NaCl ranges: a. Between 0.1 - 0.5% b. Between 0.01 - 0.1% c. Above 1.0% d. Between 0.5 - 1.0%
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16) Plants growing on sand and gravel are called: a. Eremophytes b. Oxylophytes c. Psilophytes d. Psammophytes
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17) Which of the following is a mangrove plant? a. Acanthus ilicifolius b. Avicennia offcinalis c. Ceriops roxburghiana d. All of these
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18) Mark the free floating hydrophyte: a. Sagittaria b. Typha c. Najas d. Spirodela
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19) Magnolia and oaks occur in the following zone: a. Tropical b. Sub-tropical c. Alpine d. Temperate
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20) Mark the true xerophyte: a. Capparis aphylla b. Solanum xanthocarpum c. Euphorbia milli d. All of these
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21) The temperature based zone at an altitude of 10,000 is: a. Tropical b. Sub-tropical c. Temperate d. Alpine
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22) The orange and red wave lengths of light are able to penetrates in a sea upto a depth of: a. 5 meters only b. 20 meters only c. 50 meters d. 80-100 meters
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23) The alpine forests are classed nder the plant group called: a. Mesotherms b. Megatherms c. Microtherms d. Hekistotherms
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24) The heliophytes are characterised by: a. High OP, high K+ conc. b. High OP, low K+ conc. c. Low OP, low K+ conc d. Low OP, high K+ conc.
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25) When a plant of hot climate is transferred to colder regions, it gets an injury called: a. Chilling b. Thermal death c. Desiccation d. Freezing
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26) In western Himalayas, the Betula trees usually occur in: a. Tropical zone b. Sub-tropical zone c. Alpine zone d. Temperate zone
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27) The heliophytes possess: a. Low K+ concentration and low O.P. b. High K+ concentration and low O.P. c. Low K+ concentration and high O.P. d. High K+ concentration and high O.P
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28) Flowering is induced if germinating seeds are exposed to: a. Low temperature b. High Temperature c. Temperature below freezing d. Temperature above 45 degree C
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29) The composition of soil air is affected by: a. Pore size b. Soil organisms c. Type of roots d. All of these
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30) Albido value refers to: a. Turbidity of solar radiations b. Percentage of solar absorption c. Percentage of reflected light by a surface d. Amount of light absorbed by forests
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31) Plants growing near the sea whore are generally resistant to: a. Lodging b. Erosion c. Salt spray d. Injuries
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32) The albido value of a forest is around: a. 1-2% b. 3-5% c. 5-10% d. 20-30%
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33) Plants growing in rock crevices are called: a. Sciophytes b. Chasmophytes c. Helophytes d. None of these
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34) The equatic thermal strata where no temperature gradients are observed is called: a. Epilimnion b. Metalimnion c. Hypolimnion d. Thermocline
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35) The ultraviolet radiations are able to peretreate in a sea as deep as: a. 40 meters b. 400 meters c. 200 meters d. 5 meters
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36) The facultative heliophytes are infact: a. Heliophytes b. Chasmophytes c. Chersophytes d. Sciophytes
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37) The heliophytes are characterised by: a. Vertically oriented leaves b. Horizontally oriented leaves c. Dropping leaves d. Twisted leaves
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38) The classification of plant groups on the basis of temperature differentiating four zone such as megatherms was proposed by: a. Clements b. Raunkiaer c. Odum d. Warming
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39) Which of the following is a shourt day plant? a. Triticum b. Lycopersicon c. Gossypium d. Nicotiana
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40) The percentage of argon in the atmosphere is: a. About 1% b. 0.35% c. 0.90% d. 3%
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41) The percentage of light from total solar input utilized by plants: a. About 1% b. 3 - 5% c. 7 - 8% d. 14%
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42) Plants growing in alpine zone are dwarf due to: a. Low temperature b. High wind velocity c. High light intensity d. None of these
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43) According to Geiger, the percentage of light reflected by the clouds is: a. 9% b. 10% c. 48% d. 39%
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44) An anatomical features, which exclusively develops to counter high velocity of wind: a. Reaction wood formation b. Absence of secondary growth c. Absence of tylosis d. All of these
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45) According to Mc Dougal, the parasitism caused due to fungi and bacteria represent a symbiotic relationship which is: a. Social and antagonistic b. Nutritive and antagonistic c. Social and reciprocal d. Nutritive and reciprocal
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46) The air density is maximum: a. Above 32' b. At the soil surface c. Between 32' - 64' from soil level d. In the hydrosphere
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47) The relationship between a climber and the host corresponds to: a. Neutralism b. Mutualism c. Parasitism d. Commensalism
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48) Flag trees' are formed due to: a. Lodging b. Erosion and deperition c. Unidirectional wind d. Salt spray
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49) Plants growing on burnt soil are called: a. Heliophilous b. Hydrophilous c. Pyrophilous d. Pyriform
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50) The lichens show a mutualistic relationship originating from: a. Obligate parasitism b. Facultative parasitism c. Halotism d. None of these
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