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BIOLOGY
Nicotine -...

Nicotine -

A

stimulates adrenal gland

B

is an alkaloid

C

is present in tobacco

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
C
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In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Athletes are advised not to smoke. R: Nicotine stimulates adrenal glands to release adrenaline into blood circulation, which raises heart rate and blood pressure

Nicotinic acid (K_(a)=1.4xx10^(-5)) is represented by the formula HNiC. Calculate its percentage dissociation in a solution which contains 0.10 mole of nicotinic acid per 2.0 litre of solution.

Knowledge Check

  • Select correct option among the given statements regarding true and false. (a) Nicotine reduces the concentration of haembound oxygen, br (b) Nicotine raises blood pressure and increases heart rate, br ( c ) Smoking is associated with increased incidence of cancers, br (d) Smoking causes oxygen deficiency only in the lungs.

    A
    (a)T, (b)T, ( c)T, (d)T
    B
    (a) T, (b) F, (c ) T, (d) F
    C
    (a) F, (b) F, (c ) T, (d) T
    D
    (a) T, (b) T, (c ) T, (d) F

  • Assertion: Nicotine, caffeine, quinine, strychnine and opium are produced by plants actually as defences against grazers and browsers. Reason: Thorns of Aacia and Cactus are most common physiological of defence.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
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  • Go through the following Statements (i) Cocaine interferes with the transport of neurotransmitter dopamine (ii) Atropa belladona and Datura are used by criminals for stupefying, roadside robbery and kidnapping etc. (iii) Nicotine stimulates adreal gland to release adrenaline and nor-adrenaline into blood circulation, both of which raise blood pressure and increase heart rate. (iv) Pethidine, commonly called smack is chemically diacetylmorphine wihch is obtained by acetylation of morphine . Which of these are correct?

    A
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    B
    (i), (iii) & (iv)
    C
    (i), (ii) & (iii)
    D
    All are correct

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    Nicotinic acid (K_(a)=1.4xx10^(-5)) is represented by the formula HNiC. Calculate its percentage dissociation in a solution which contains 0.10 mole of nicotinic acid per 2.0 litre of solution.

    Nicotinic acid (K_a = 1.4 xx 10^(-5)) is represented by the formula HNiC. Calculate its per cent dissociation in a solution which contains 0.10 mol of nicotinic acid per 2.0 L of solution.

    Nicotinic acid (K_(a)=1.4xx10^(-5)) is repersented by the formula HNiC. Calculate its per cent dissociation in a solution, which contains 0.10 mole of nicotinic acid per 2.0 litre of solution.

    Select the false statements I. An antibody is a protein molecule made by the lymphocytes. II. An antibody binds to a specific foreign antigen and neutralizes its odd effects. III. A type of acquired immune response is called cell mediated immunity. This type of immunity is mediated by lymphocytes. IV. Cancer is contagious and cells can spread from one person to another. V. Cancerous cells are highly differentiated cells. VI.CAncer detection is based on biopsy and histopathological studies of the tissue adn blood. VII. Techniques like radiography, CT and MRI are very useful to detect cancers of the internal organs. VIII. Diseases which are easily transmitted from one personto another, are called ifectious diseases. IX.AIDS is non infectious and cancer is infectious disease. X> Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. XI. Sustained high fever ( 39^(@) to 40^(@)C ) weakness, stomach pain, constipation, headache and loss of appetite are some of the common symptoms of typhoid. XII. Nicotine stimulates thyroid gland. XIII. Smoking increases CO_(2) content in blood. XIV. AIDS has no cure, prevention is the best option. XV. HIV/AIDS infected people should be shunned by society.

    A solution containing 8.0 g of nicotine in 92 g of water-frezes 0.925 degrees below the normal freezing point of water. If the freezing point depression constant K_(f) = -1.85^(@)C mol^(-1) then the molar mass of nicotine is -

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