Practice MCQ Biology

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2739 Ozone hole refers to
Options:hole in ozone layer,    decrease in the ozone layer in troposphere,    decrease in thickness of ozone layer in stratosphere,    increase in the thickness of ozone layer in troposphere

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2740 Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to
Options:angiosperms,    gymnosperms,    monocotyledons,    dicotyledons

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2741 Pollination is best defined as
Options:transfer of pollen from anther to stigma,    germination of pollen grains,    growth of pollen tube in ovule,    visiting flowers by insects

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2742 Plants receive their nutrients mainly from
Options:chlorophyll,    atmosphere,    light,    soil

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2743 Movement of cell against concentration gradient is called
Options:osmosis,    active transport,    diffusion,    passive transport

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2744 Photosynthesis generally takes place in which parts of the plant?
Options:Leaf and other chloroplast bearing parts,    stem and leaf,    Roots and chloroplast bearing parts,    Bark and leaf

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2745 Most fish do not sink in water because of the presence of swim bladderair bladderair sacsair in spongy bones
Options:I and II are correct,    II and III are correct,    III and IV are correct,    I, II, III and IV are correct

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2746 Plants synthesis protein from
Options:starch,    sugar,    amino acids,    fatty acids

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2748 Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with
Options:all gymnosperms, except conifers,    only angiosperms,    only conifers,    angiosperms and all gymnosperms except conifers

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2749 One of the following is not a function of bones.
Options:Place for muscle attachment,    Protection of vital organs,    Secretion of hormones for calcium regulation in blood and bones,    Production of blood corpuscles

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2750 Plants absorb most part of water needed by them through their
Options:embryonic zone,    growing point,    root hairs,    zone of elongation

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2751 Photo-oxidation is
Options:photorespiration,    photolysis,    light and oxygen induced breakdown,    All of the above

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2752 Process of cell division can take place by
Options:heterosis,    fusion,    mitosis,    None of these

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2753 Most highly intelligent mammals are
Options:whales,    dolphins,    elephants,    kangaroos

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2754 Plant development is influenced by
Options:quality of light only,    quality and quantity of light,    quality and duration of light,    quality, quantity and duration of light

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2755 Prokaryotic cells lack
Options:nucleolus,    nuclear membrane,    membrane bound by organelles,    All of these

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2756 Photosynthesis takes place faster in
Options:yellow light,    white light,    red light,    darkness

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2757 Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by
Options:Robert Hooke,    Robert Brown,    Rudolf Virchow,    Theodore Schwann

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2758 Primary phloem develops from
Options:lateral meristem,    protoderm,    extrastelar cambium,    provascular tissue

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2759 Other than spreading malaria, anopheles mosquitoes are also vectors of
Options:dengue fever,    filariasis,    encephalitis,    yellow fever

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2760 Plants that grow in saline water are called
Options:halophytes,    hydrophytes,    mesophytes,    thallophytes

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2761 Pyorrhoea is a disease of the
Options:nose,    gums,    heart,    lungs

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2762 O2 released in the process of photosynthesis comes from
Options:CO2,    water,    sugar,    pyruvic acid

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2763 Placenta is the structure formed
Options:by the union of foetal and uterine tissue,    by foetus only,    by fusion of germ layers,    None of these

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2764 Plants hormone that induces cell division is
Options:auxins,    gibberellins,    kinins,    domins

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2765 Neurospora is used as genetic material because
Options:it has short life cycle of 10 days,    the product of single meiosis can be easily analysed,    meiotic products are linearly arranged in the form of ordered tetrads,    is a diploid fungus

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2766 Phloem is a tissue found in
Options:reproductive organs of animals,    plants,    insects,    mammals

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2767 N2 content is kept constant in the biosphere due to
Options:N2 fixation,    industrial pollution,    nitrogen cycle,    absorption of N2

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2768 out of proteins, lipids and carbohydrates present in a cell membrane, what is true?
Options:Lipids are maximum,    Carbohydrates are minimum,    Carbohydrates are maximum,    All three are in equal proportion

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2769 Potato is a modified form (outgrowth) of
Options:root,    stem,    fruit,    leaf

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2770 Of the following taxonomic categories which is the most inclusive (i.e. is the highest in hierarchy)?
Options:Order,    Subspecies,    Class,    Genus

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2771 Prothrombin which helps in clotting of blood is released by
Options:lymphocytes,    erythrocytes,    monocytes,    blood platelets

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2772 Myopia is connected with
Options:ears,    eyes,    lungs,    None of these

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2773 Most of the red, blue and purple colours of plants are due to a pigment called
Options:anthocyanin,    carotene,    chlorophyll,    xanthophylls

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2774 Plants developing in dry conditions are
Options:xerophytes,    mesophytes,    lithophytes,    hydrophytes

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2775 Plants growing on sand are called as
Options:chasmophytes,    oxylophytes,    lithophytes,    psammophytes

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2776 Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
Options:flavoxanthin,    melanin,    carotene,    Xanthophyll

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2777 Ramapithecus and Cro-Magnon man are considered
Options:ancestors of modern man,    ancestors of monkey,    ancestors of lion,    None of the above

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2778 Normal adult human male has
Options:10 gram of haemoglobin/100 gram of blood,    14 gram of haemoglobin/100 gram of blood,    18 gram of haemoglobin/100 gram of blood,    24 gram of haemoglobin/100 gram of blood

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2779 Plants wilt due to excess of
Options:transpiration,    photosynthesis,    absorption,    None of these

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2780 Monotremes are unique mammals because they
Options:posses hair,    give birth to live young,    secret milk in a pouch,    lay eggs

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2781 Poison glands of snakes are homologous to
Options:electric organs of fishes,    stings of rays,    sebaceous glands of mammals,    salivary glands of vertebrates

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2782 Radical vascular bundles are those in which
Options:xylem is surrounded by phloem,    phloem is surrounded by xylem,    xylem and phloem occur on the same radius,    xylem and phloem occur on the different radii

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2783 Plant bends towards the source of light on account of the movement of curvature known as
Options:geotropism,    thigmotropism,    chemotropism,    phototropism

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2784 Plant have ____ while animals lack it.
Options:starch,    cellulose,    protein,    fat

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2785 Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?
Options:Exact concentration of solution is not given,    Character of semi permeable membrane is not given,    The flow of solution is not possible through semi permeable membrane,    All are incorrect

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2786 Photosynthesis is a process
Options:reductive and exergonic,    reductive and catabolic,    reductive, endergonic and catabolic,    reductive, endergonic and anabolic

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2787 On which of the following plants did Gregor Mendal perform his classical experiment?
Options:Gram,    Maize,    Pea,    Wheat

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2788 Pigmentation of skin is due to
Options:lymphocytes,    monocytes,    leucocytes,    melanocytes

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2789 Norepinephrine increases
Options:respiration,    urine production,    saliva production,    blood pressure

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