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Biology 2011

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Q. 58. Select the correct option with respect to mitosis

  1. Chromosomes move to the spindle equator and get alingned along equatorial plate in metaphase
  2. Chromatids separate but remain in the centre of the cell in anaphase
  3. Chromatids start moving towards opposite poles in telophase
  4. Golgi complex and endoplasmic reticulum are still visible at the end of prophase

Sol:

Chromatids show poleward movement in anaphase; golgi and ER disappears in late prophase.

Answer: (1)

Q. 59. Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?

  1. A: Lecithin - a component of cell membrane
  2. B: Adenine - a nucleotide that makes up nucleic acids
  3. A: Triglyceride - major source of energy
  4. B: Uracil - a component of DNA

Sol:

A is the formula of Lecithin. Lecithin is a phospholipid and is the component of the cell membranes. B is the formula of adenine which is a nitrogenous base not a nucleotide.

Answer: (1)

Q. 60. What was the most significant trend in the evolution of modern man (Homo sapiens) from his ancestors?

  1. Increasing brain capacity       
  2. Upright posture
  3. Shortening of jaws   
  4. Binocular vision

Sol:

The most significant trend in the evolution of modern man (Homo sapiens) from the ancestors is increasing brain capacity.

Answer: (1)

Q. 61.  Which one of the following conditions correctly describes the manner of determining the sex in the given example?

  1. Homozygous sex chromosomes (XX) produce make in Drosophila
  2. Homozygous sex chromosomes (ZZ) determine female sex in birds
  3. XO type of sex chromosomes determine male sex in grasshopper
  4. XO condition in humans as found in Turner Syndrome, determines female sex

Sol:

X/A ratio determines sex in Drosophila ; is heterogametic (ZW) in birds. In 'XO type' the 'O' determines maleness.

Answer: (3)

Q. 62.   A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?

  1. Type A
  2. Type B
  3. Type AB      
  4. Type O

Sol:

The person with blood group O is said to universal donor, because in this, there are no antigens on the surface of RBC.

Answer: (4)

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