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Biology 2011

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Q. 63.    What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope?

  1. Base pairs  
  2. Genes
  3. Nucleotides
  4. Nucleosomes

Sol:

Nucleosome consist of octameric histone core wrapped by dsDNA

Answer: (4)

Q. 64.    Match the source gland with its respective hormone as well as the function

Source gland

Hormone

Function

Thyroid

Thyroxine

Regulates blood calcium level

Anterior pituitary

Oxytocin

Contraction of uterus muscles during child birth

Posterior pituitary

Vasopressin

Stimulates resorption of water in the distal tubules in the nephron

Corpus luteum

Estrogen

Supports pregnancy

Sol:

Vasopressin (ADH) is synthesised in hypothalamus but released into the blood from posterior lobe of pituitary,so it is called as a hormone of posterior lobe. It stimulates reabsorption of water in distal tubules in the nephron.

Answer: (3)

Q. 65.  Which of the following is correctly stated as happens in the common cockroach?

  1. The food is ground by mandibles an gizzard
  2. Malpighian tubules are excretory organ projecting out from the colon
  3. Oxygen is transported by haemoglobin blood
  4. Nitrogenous excretory product is urea

Sol:

In cockroach the food is grinded by mandibles and gizzard. In insects there is no oxygen transporting pigment and nitrogenous excretory product is uric acid.

Answer: (1)

Q. 66. A large proportion of oxygen is left unused the human blood even after its uptake by the body tissues. This O2

  1. Helps in releasing more O2 to the epithelium tissues
  2. Acts as a reserve during muscular exercise
  3. Raises the pCO2 of blood to 75 mm of Hg
  4. Is enough to keep oxyhaemoglobin saturation at 96%

Sol:

Our tissues are able to utilise only 25% of O2 carried by arterial blood. Our venous blood is still 75% saturated with O2. This O2 acts as a reserve during muscular exercise.

Answer: (2)

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