Answer : Option AExplaination / Solution:
Each tooth is embedded in a socket of jaw bone called thecodont. Human being forms two sets of teeth during their life temporary milk or deciduous teeth replaced by a set of permanent or adult teeth called diphyodont. An adult human has 32 permanent teeth which are of four different types called heterodont.
Answer : Option AExplaination / Solution:
A number of bacteria, fungi, virus etc. cause disease in human beings. These disease causing microbes are called pathogens.
Answer : Option BExplaination / Solution:
Nissl’s grains are mainly present in cyton and dendrite. These granules are rough endoplasmic reticulum with rosettes of free ribosome, the site for protein synthesis. It is absent in axon.
Q9.Genetic information is carried out by long chain molecule made up of
Answer : Option CExplaination / Solution:
Genetic information is carried out by DNA and RNA. Both DNA and RNA are called genetic material, made up of long chain of nucleotide having- nitrogenous base, sugar and phosphate ions.