On high mountains, difficulty in breathing is due to :

• decrease in partial pressure of O₂

• decrease in amount of O₂

• increase in CO₂ conc

• all of the above

In DNA, which is absent :

• Adenine

• Thymine

• Guanine

• Uracil

Example of Analogous organs is :

• wings of bird and insect

• forelimbs of horse and man

• teeth of elephant and man

• none of the above

Mutation is more common when it is present in:

• dominant condition

• recessive condition

• constant in population

• none of the above

Lymphocytes are formed by :

• plasma cells

• mast cells

• liver cells

• none of these

Which is called soluble RNA ?

• rRNA

• tRNA

• mRNA

• hnRNA

e -DNA is formed from m-RNA by which enzyme:

• restriction endonuclease

• reverse transcriptase

• DNA polymerase

• RNA polymerase

'Convergent Evolution' is shown by :

• homologous organs

• analogous organs

• vestigial organs

• above three

In DNA, which is absent ?

• Adenine

• Guanine

• Uracil

• Cytosine

Set which includes only analogous organs is :

• wings of butterfly, housefly and bat

• hindlegs of horse, grasshopper and bat

• wings of btterfly and Wingspread of bat and birds

• mandibles of cockrach, mosquito and honey bee