MCQOPTIONS
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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 3051. |
Secondary pollutant which stops Hill reaction is [CBSE PMT 1999; Kerala CET 2002] |
| A. | Sulphuric acid |
| B. | Nitric acid |
| C. | Peroxyacetyl nitrate (PAN) |
| D. | Aldehydes |
| Answer» D. Aldehydes | |
| 3052. |
PAN (Peroxyacetyl nitrate) is an important constituent of photochemical smog. It is a [CBSE PMT 1999; BHU 2005] |
| A. | Primary pollutant |
| B. | Secondary pollutant |
| C. | Natural pollutant |
| D. | Corrollary pollutant |
| Answer» C. Natural pollutant | |
| 3053. |
Carbon monoxide is a pollutant because [CBSE PMT 1998] |
| A. | It reacts with |
| B. | It inhibits glycolysis |
| C. | Reacts with haemoglobin |
| D. | Makes nervous system inactive |
| Answer» D. Makes nervous system inactive | |
| 3054. |
Noise pollution is created if noise is in excess to [Pb. PMT 1999] |
| A. | 70-75 dB |
| B. | 50-60 dB |
| C. | 80-99 dB |
| D. | 40-65 dB |
| Answer» D. 40-65 dB | |
| 3055. |
Which important green-house gas, other than methane, is being produced from the agricultural fields [CBSE PMT 1998] |
| A. | Arsine |
| B. | Sulphur dioxide |
| C. | Ammonia |
| D. | Nitrous oxide |
| Answer» E. | |
| 3056. |
B.O.D. test or biological oxygen demand test is made for measuring |
| A. | Air pollution |
| B. | Water pollution |
| C. | Noise pollution |
| D. | Soil pollution |
| Answer» C. Noise pollution | |
| 3057. |
Most hazardous metal pollutant of automobile exhaust is [KCET 1998, 2000; MP PMT 2002; Pb. PMT 2000] |
| A. | Mercury |
| B. | Lead |
| C. | Cadmium |
| D. | Copper |
| Answer» C. Cadmium | |
| 3058. |
In coming years, skin related disorders will be more common due to [CBSE PMT 1997] |
| A. | Pollutants in air |
| B. | Use of detergents |
| C. | Water pollution |
| D. | Depletion of ozone layer |
| Answer» E. | |
| 3059. |
The river 'Sone' receives wastes from [MP PMT 1997] |
| A. | Refinery |
| B. | Distillery |
| C. | Textile mill |
| D. | Paper mill |
| Answer» E. | |
| 3060. |
Oxides of sulphur and nitrogen are important pollutants of [MP PMT 1997] |
| A. | Air and water |
| B. | Air |
| C. | Water |
| D. | Soil |
| Answer» C. Water | |
| 3061. |
Water pollution [MP PMT 1997; BHU 2002] |
| A. | Increases oxygenation |
| B. | Decreases turbidity |
| C. | Increases turbidity and deoxygenation |
| D. | Increases photosynthesis |
| Answer» D. Increases photosynthesis | |
| 3062. |
Air pollution effects are usually found on [MP PMT 1997] |
| A. | Leaves |
| B. | Flowers |
| C. | Stems |
| D. | Roots |
| Answer» B. Flowers | |
| 3063. |
Carbon monoxide is a major pollutant of [MP PMT 1996] |
| A. | Water |
| B. | Air |
| C. | Noise |
| D. | Soil |
| Answer» C. Noise | |
| 3064. |
Fishes die by sewage because [CBSE PMT 1996] |
| A. | Of its bad smell |
| B. | It replaces food material of fishes |
| C. | It increases oxygen competition among fishes |
| D. | is mixed in large amount in water |
| Answer» D. is mixed in large amount in water | |
| 3065. |
Which of the following country is responsible for releasing largest amount of green-house gases [CBSE PMT 1996, 2002; BVP 2002] |
| A. | Russia |
| B. | Germany |
| C. | Brazil |
| D. | America (USA) |
| Answer» E. | |
| 3066. |
Global climate is threatened by increase in concentration of |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Water vapours |
| D. | Greenhouse gases |
| Answer» E. | |
| 3067. |
In which type of flowers, stigma is rough and sticky [NCERT 1978; CPMT 1988] |
| A. | Insect pollinated |
| B. | Wind pollinated |
| C. | Water pollinated |
| D. | All the above |
| Answer» C. Water pollinated | |
| 3068. |
Pollination occurs when a pollen grain [DPMT 1993] |
| A. | Matures and has three nuclei |
| B. | Lands on a stigma |
| C. | Releases its sperm nuclei |
| D. | Releases its pollen tube nucleus |
| Answer» C. Releases its sperm nuclei | |
| 3069. |
In Ficus (Peepal) pollination is affected by |
| A. | Air |
| B. | Water |
| C. | Insects |
| D. | Birds |
| Answer» D. Birds | |
| 3070. |
Which one of the following is an example of cleistogamy |
| A. | Sunflower |
| B. | Vallisneria |
| C. | Commelina |
| D. | Calatropis |
| Answer» D. Calatropis | |
| 3071. |
The process of transfer of pollen grains from another to stigmatic surface of the flower with the help of water is called [J&K CET 2005] |
| A. | Anemophily |
| B. | Zoophily |
| C. | Hydrophily |
| D. | Ornithophily |
| Answer» D. Ornithophily | |
| 3072. |
For self-pollination flower must be [Haryana PMT 2005] |
| A. | Unisexual |
| B. | Bisexual |
| C. | Monosexual |
| D. | Asexual |
| Answer» C. Monosexual | |
| 3073. |
Intra-species incompatibility can be overcome by [AIEEE 2003] |
| A. | Wetting of the stigma |
| B. | Bud-pollination |
| C. | Mixed-pollination |
| D. | Intra-ovarian pollination |
| Answer» E. | |
| 3074. |
Contrivances for self pollination are [J & K CET 2002] |
| A. | Bisexuality |
| B. | Homogamy |
| C. | Cleistogamy |
| D. | All of these |
| Answer» E. | |
| 3075. |
Cheiropterophily is the process of pollination by [MP PMT 2000; KCET 2004] |
| A. | Water |
| B. | Bat |
| C. | Insect |
| D. | Bird |
| Answer» C. Insect | |
| 3076. |
Anemophilous pollination is mainly observed in [CPMT 2000; CBSE PMT 2001] |
| A. | Graminae |
| B. | Annonaceae |
| C. | Papilionaceae |
| D. | Euphorbiaceae |
| Answer» B. Annonaceae | |
| 3077. |
Pollination by insects is called [CPMT 1998] |
| A. | Entomophily |
| B. | Chirepterophily |
| C. | Anemophilly |
| D. | Zoophilly |
| Answer» B. Chirepterophily | |
| 3078. |
In which characters air pollinated flowers differ from insect pollinated ones |
| A. | Due to small parianth and sticky pollen |
| B. | Small coloured parianth and heavy pollen grains |
| C. | Coloured parianth and large pollen grains |
| D. | Without parianth and light pollen grains |
| Answer» E. | |
| 3079. |
The mature stigma is either rough or sticky in [RPMT 1997; AFMC 2003] |
| A. | All types of flowers |
| B. | Water pollinated flowers |
| C. | Wind pollinated flowers |
| D. | Insect pollinated flowers |
| Answer» D. Insect pollinated flowers | |
| 3080. |
Flowers preventing self-pollination is called [KCET 1998] |
| A. | Dichogamy |
| B. | Protanary |
| C. | Herkogamy |
| D. | Protogyny |
| Answer» D. Protogyny | |
| 3081. |
Cross pollination in crop plant is known as [MP PMT 1998; BHU 2002] |
| A. | Autogamy |
| B. | Allogamy |
| C. | Cleistogamy |
| D. | Chasmogamy |
| Answer» C. Cleistogamy | |
| 3082. |
Pollination is best defined as [AFMC 1994] |
| A. | Transfer of pollen from anther to stigma |
| B. | Germination of pollen grains |
| C. | Growth of pollen tube in ovule |
| D. | Visiting flowers by insects |
| Answer» B. Germination of pollen grains | |
| 3083. |
Pollination which occurs in closed flowers is known as [AFMC 1994] |
| A. | Allogamy |
| B. | Cleistogamy |
| C. | Dicliny |
| D. | Protogyny |
| Answer» C. Dicliny | |
| 3084. |
Feathery stigma is present in [BHU 1995] |
| A. | Wheat |
| B. | Pea |
| C. | Ceasalpinia |
| D. | Datura |
| Answer» B. Pea | |
| 3085. |
The pollination by the birds is called [CPMT 1993; HP PMT 2005] |
| A. | Ornithophily |
| B. | Chiropterophily |
| C. | Entomophily |
| D. | Malacophily |
| Answer» B. Chiropterophily | |
| 3086. |
Progeny produced as a result of cross pollination [CMC Vellore 1994] |
| A. | Shows high degree of variability and is evolutionary important |
| B. | Is sterile |
| C. | Has recessive characters |
| D. | Is homozygous with phenotypic uniformity |
| Answer» B. Is sterile | |
| 3087. |
In maize, pollination is |
| A. | Anemophilous |
| B. | Ornithophilous |
| C. | Malacophilous |
| D. | Entomophilous |
| Answer» B. Ornithophilous | |
| 3088. |
The transfer of pollen grain from the stamen to the stigma of the same flower is [JIPMER 1994] |
| A. | Autogamy |
| B. | Allogamy |
| C. | Geitnogamy |
| D. | Xerogamy |
| Answer» B. Allogamy | |
| 3089. |
Pollination characteristically occurs in [BHU 1994] |
| A. | Angiosperms and fungi |
| B. | Angiosperms and gymnosperms |
| C. | Pteridophytes and angiosperms |
| D. | Bryophytes and angiosperms |
| Answer» C. Pteridophytes and angiosperms | |
| 3090. |
A close relation between flower and pollinating agent is best exhibited by [BHU 1994] |
| A. | Cocos |
| B. | Salvia |
| C. | Yucca |
| D. | Avena |
| Answer» C. Yucca | |
| 3091. |
The pollination which occurs in one plant is [DPMT 1992] |
| A. | Herkogamy |
| B. | Cleistogamy |
| C. | Dichogamy |
| D. | Dicliny |
| Answer» C. Dichogamy | |
| 3092. |
The allogamy is best favoured by [DPMT 1990] |
| A. | Homogamy |
| B. | Cleistogamy |
| C. | Dicliny |
| D. | All of the above |
| Answer» D. All of the above | |
| 3093. |
Part of the gynoecium which receives the pollen is called [AIIMS 1992; MP PMT 2004] |
| A. | Ovary |
| B. | Ovule |
| C. | Style |
| D. | Stigma |
| Answer» E. | |
| 3094. |
In sausage tree (Kigelia africana) the pollination takes place by [BHU 1993] |
| A. | Birds |
| B. | Bats |
| C. | Wind |
| D. | Insects |
| Answer» C. Wind | |
| 3095. |
In which of the following pollination takes place by lever mechanism [BHU 1985] |
| A. | Salvia |
| B. | Ficus |
| C. | Antirhinum |
| D. | Ocimum |
| Answer» B. Ficus | |
| 3096. |
Pollination by water is seen in [CPMT 1985] |
| A. | Nelumbium |
| B. | Vallisneria |
| C. | Eichornia |
| D. | Nymphaea |
| Answer» C. Eichornia | |
| 3097. |
The insect Blastophaga grossorum is associated with the pollination of [NCERT 1985] |
| A. | Mango |
| B. | Paddy |
| C. | Beans |
| D. | Ficus |
| Answer» E. | |
| 3098. |
Continuous self-pollination in a species develops |
| A. | Strong off springs |
| B. | Weak off-springs |
| C. | New varieties |
| D. | Seedless fruits |
| Answer» C. New varieties | |
| 3099. |
In bisexual flowers when the gynoecium matures earlier than the androecium, it is called [CPMT 1984] |
| A. | Protandry |
| B. | Protogyny |
| C. | Heterogamy |
| D. | Autogamy |
| Answer» C. Heterogamy | |
| 3100. |
In plants, in nature, autogamy is avoided since the seeds produced [JIPMER 1993] |
| A. | Are fewer in number |
| B. | Do not germinate successfully |
| C. | Do not produce healthy plants |
| D. | All the above |
| Answer» E. | |