461. Which one of the following is caused by the expression of a recessive gene present on sex chromosome?
      (a) Rheumatism
      (b) Nervous shock
      (c) Muscular dystrophy
      (d) Cerebral haemorrhage
Ans: (c)
462. Match the following:
     List-I                                        List-II
     (Substance)                        (Physiological role)
     A. Ptyalin                         1. Converts angiotensinogen in blood into angiotensin
     B. Pepsin                          2, Digest starch
     C. Renin                           3. Digests proteins
     D. Oxytocin                        4. Hydrolyses fats
                                        5. Induces contraction of smooth muscles
            A        B         C        D
       (a) 2         3         1        5
       (b) 3         4         2        5
       (c) 2         3         5        1
       (d) 4         3         2        1
Ans: (a)
463. Leaves Call off branches In the winter because of
      (a) fall in atmospheric pressure
      (b) completion of the duration of life of the plant
      (c) formation of separation (absciss layer) just outside the cork
      (d) shortening of day time
Ans: (c)
464. Which among the following animals has the largest Intestine?
      (a) Cow
      (b) Lion
      (c) Monkey
      (d) Tiger
Ans: (a)
465. It Is not advisable to sleep under a tree at night because of release of
      (a) oxygen in a lesser quantity than the required levels
      (b) oxygen in large amounts
      (c) carbon monoxide
      (d) carbon dioxide
Ans: (d)
466. Higher plants take up nitrogen as
      (a) Nitrites only
      (b) Nitrates only
      (c) Nitrates and Ammonia
      (d) Urea
Ans: (c)
467. Green plants In the sea are useful for respiration of flash because they
      (a) release oxygen
      (b) release carbon dioxide
      (c) release oxygen and carbon dioxide simultaneously
      (d) take oxygen and give out carbon dioxide
Ans: (a)
468. Stripes on the bodies of animals Indicate
      (a) mating habit
      (b) food habit
      (c) cave dwelling
      (d) matching of skin colour with the surroundings
Ans: (d)
469. Which among the following is a balanced fertiliser for plants?
      (a) Urea
      (b) Ammonium Sulphate
      (c) Nitrates