Which of the following statement is correct?
(a) Rickettsias lack cell wall
(b) Prions are the smallest free-living cells
(c) The cell wall of Mycoplasmas is made up of amino sugars
(d) Viroids consist of a single-stranded RNA molecule
Among living organisms, which one of the following is the most responsible factor for bringing about the origin of a new species?
(a) Sexual Reproduction
(b) Natural Selection
Which of the following is monogamous?
Which organelle in the Cell, other than nucleus, contains DNA?
(b) Golgi apparatus
Which of the following is not radioactive?
Epiphytes are plants which depend on other plants for
(a) Mechanical support
At which stage in its life cycle does the silk worm yield the level is commonly expressed as
The stones formed in human kidney consist mostly of
(b) Magnesium sulphate
(c) Calcium oxalate
(d) Sodium acetate
Which of the following can be the blood groups of the parents of a baby having blood group A?
(a) O and AB
(b) A and B
(c) B and AB
(d) All the above
Which of the following terms is NOT related to grassland biome?
(c) Arctic horse