biology Mcqs
901. Epinasty is controlled by_____________?
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A. Abscisins

B. Cytokinins

C. Gibberellins

D. Auxins
902. Roots of a plant show______________?
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A. Negative tactic movement and positive tropic movement

B. Positive geotropism of stem and roots

C. Positive phototropism and negative geotropism

D. Negative phototropism and positive geotropism
903. Which of the following statement about filicinae a group of tracheophytes is incorrect_________________?
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A. They live in shady and moist areas.

B. They are seedless and their leaves are called fronds

C. They belong to sphenopsida

D. They show circinate vernation.

904. Central nervous system of man consists of______________?
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A. Brain

B. Spinal cord

C. Both of these

D. none of these

906. Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.
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A. Ca2+ goes back inside sarcoplasmic reticulum.

B. Troponin uncovers the actin binding sites.

C. Tropomyosin gets removed from the binding sites of actin filaments.

D. Binding sites of actin get attached to the myosin head.

907. Chemically auxins are____________?
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A. Indole propionic acid.

B. Indole acetaldehyde

C. Indole carboxylic acid.

D. Indole acetic acid.
908. In Hornworts the band of meristematic tissue is found near_____________?
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A. At junction of A & B

B. Gamete producing region

C. Foot

D. Spore producing region

911. Maximum speed of nerve impulse transmission is____________?
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A. 110 m/sec

B. 100 m/sec

C. 130 m/sec.

D. 120m/sec
913. Megaphylls are characteristic for____________?
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A. Ferns

B. Seed plants

C. Both of these

D. None of these

914. Hornwarts are included in sub-class of __________?
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A. Hepaticopsida

B. Anthoceropsida

C. Bryopsida

D. Psilopsida

915. Which type of the receptors are present in the ear__________________?
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A. Photoreceptors

B. Chemoreceptors

C. Thermoreceptors

D. Mechanoreceptors
916. Graves disease is produced due to____________?
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A. Overproduction of corticosteroids

B. Overproduction of thyroxin

C. Undersecretion of thyroxin

D. Undersecretion of corticosteroids

917. In alcoholic fermentation Pyruvic acid is broken down into?
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A. Acetaldehyde

B. Lactic acid

C. Ethyl alcohol

D. Methyl alcohol

919. Protonema is___________?
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A. Fungus like

B. Plant like

C. Algae like

D. Thallus like

920. Which of the following is a uni-nucleated cell?
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A. All of these

B. A skeletal muscle cell.

C. A cardiac muscle cell.

D. A smooth muscle cell.
921. Which of the following statement about an arthropod exoskeleton is incorrect?
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A. It permits gaseous exchange

B. Like all the other types of exoskeleton, they lack sensation

C. It provides muscle attachment

D. It contains joints, for the same purpose as present in human skeletal system
922. Ground pries are also known as___________?
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A. Lycopods

B. Spike mosses

C. Both of these

D. None of these

924. Insertion of Biceps is on_________?
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A. Radius

B. Ulna

C. Olecronon process of ulna.

D. Scapula

930. What happens during muscle contraction to the length of each myosin and action filament?
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A. There is no change in sarcomere

B. A band becomes short

C. Z- lines get closer

D. 1 band elongates

931. Visible light used in photosynthesis ranges from:__________?
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A. 380 750 nm in wavelength

B. 390 790 nm in wavelength.

C. 350 750 nm in wavelength

D. 300 700 nm in wavelength

932. Na+ -K+ ATPase pump is important for_______________?
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A. Maintenance of resting potential

B. Massive out flux of K+ after depolarization

C. Conversion of resting potential into action potential

D. Recovery of resting potential
937. Production of two types of spores is known as________________?
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A. Homospory

B. Gamospory

C. Heterospory

D. Heterogamy

938. Chlorosis, i.e., yellowish hue on the leaves results from_____________?
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A. Deficiency of chlorophyll.

B. Short supplies of mineral nutrients in the soil.

C. Accumulation of toxic waste products in leaves.

D. All of these
939. Reflex actions below the neck are under control of____________?
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A. Spinal cord

B. Brain

C. Hypothalamus

D. none of these.

940. Chlorophylls mainly absorb _________ wavelengths?
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A. Violet red

B. Yellow orange

C. Orange blue

D. Orange red.
943. In which of the following neurons length of dendrite is greater than axon_______________?
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A. Associative neuron

B. Motor neuron

C. none of these.

D. Sensory neuron
944. Molecular formula of chlorophyll b is_____________?
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A. C55 H71 O6 N4 Mg

B. C55 H70 O6 N4 Mg

C. C55 H70 O6 N5 Mg

D. C55 H10 O4 N6 Mg

945. Which of the following muscle is an antagonistic member of Biceps brachii?
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A. Intercostals

B. Bracheoradialis

C. Triceps

D. Brachialis.

947. Xanthophylls are _________ pigments
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A. Yellow

B. Green

C. Red

D. Orange

948. Which of the following statements about fractures in old age is incorrect?
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A. They are more common than in adult age.

B. Occur as a result of bone being thin and weak.

C. Due to good blood supply it results in quick healing.

D. It involves osteoblasts and osteocytes.