Biology today

3838 MTMTBIOLOGY TODAYBIOLOGY TODAY || march ‘16march ‘16

CHAPTER-8 : HuMAn HEAlTH AnD DIsEAsE

1. (d) 2. (c) 3. (b) 4. (d) 5. (d)


2. (d) 7. (a) 8. (d) 9. (d) 10. (b)


3. False : Shuffner’s dots are seen in red blood corpuscles of
   man due to malaria.


4. True


5. False : hIV has a protein coat and a genetic material which
   is ssrNa.


6. True 15. True


7. False. Igm is so named as it is a macroglobulin, five times
   larger than IgG.


8. False. chikungunya virus is transmitted by female Aedes
   aegypti mosquito.


9. True


10. False. Igm and IgG are produced during primary immune
    response while IgG mainly is responsible for secondary
    immune response.


11. False. alcohol is not a stimulant. rather it acts as sedative,
    analgesic and anaesthetic.


12. a-(iv), B-(i), c-(v), D-(iii), E-(ii)


13. a-(i, vi), B-(ii, x), c-(iii, vii), D-(iv, viii), E-(v, ix)
    23.(A) (i) pathogen specific (ii) memory
    (iii) pathogen (iv) primary response
    (v) low (vi) high
    (vii) B-lymphocytes (viii) T-lymphocytes
    (ix) antibodies (x) B cells
    (B) Plasmodium enters the human body as cryptomerozoites
    sporozoites through the bite of infected male female
    Anopheles mosquito. The parasite initially multiplies
    within rBcs liver cells and then attacks liver cells
    rBcs resulting in their rupture. Genesis rupture of
    rBcs is associated with the release of haematozylin
    haemozoin which is responsible for the chill and high
    fever recurring every one three to two four days. When
    the mosquito bites an infected person, these parasite
    enter the mosquito’s body, multiply and get stored in
    rBcs salivary glands.


14. (d) 25. (d) 26. (a) 27. (c) 28. (c)


15. (a) a - Viral rNa introduced
    B - Viral DNa
    c - Viral DNa incorporated into host genome
    D - New viral rNa
    E - New virus produced

(b) The above mentioned figure refers to the mode of

action of aIDS virus. Virus of aIDS is transmitted

via blood and semen by the following methods :

(i) transfusion of infected blood or blood product,

(ii) use of contaminated needles and syringes to inject

drugs or vaccines, (iii) use of contaminated razors,

(iv) use of contaminated needles for boring pinnae,

(v) sexual intercourse with an infected partner

without a condom, (vi) from infected mother to child

through placenta, (vii) by artificial insemination,

(viii) organ transplant.

30. (a) a - Lymph nodes
    B - Thymus
    c - Spleen
    (b) ‘c’ refers to spleen. Spleen is a bean shaped organ
    which is the largest single mass of lymphoid tissue
    in the body. In foetus, it produces all types of blood
    cells but in adult, it only produces lymphocytes.
    macrophages of spleen are phagocytic.
    (c) B refers to thymus. Thymus is the site of T-lymphocyte
    maturation. Therefore, thymus helps in cellular immune
    response. It is situated near the heart and is quite
    large in size at the time of birth but keeps reducing
    with age.

CHAPTER-9 : sTRATEgIEs FoR EnHAnCEMEnT In FooD

PRoDuCTIon

1. (d) 2. (a) 3. (a) 4. (a) 5. (c)


2. (b) 7. (b) 8. (d) 9. (d) 10. (b)


3. True


4. False : Proteins of cereals and millets are deficient in lysine
   and tryptophan.


5. False : First successful pollen culture was done by Guha
   and maheshwari.


6. True


7. False : Triticale is derived by crossing wheat and rye.


8. True


9. False. more than 70 per cent of world’s livestock population
   is in India and china.


10. False. hybrid between female ass and male horse is called
    hinny.


11. True 20. True


12. a-(iv), B-(iii), c-(v), D-(ii), E-(i)


13. a-(ii, viii), B-(i, ix), c-(v, vii), D-(iv, vi), E-(iii, x)

sOLuTIOns