Seasonal isolation refers to the differences in season of breeding that can isolate two varieties. Behavioural or ethological isolation refers to differences in behaviour like courtship rituals etc. to prevent mating. Mechanical isolation refers to the differences in the position, size and structure of animal genitalia which prevent reproductive contact and thus bring about isolation. Reproductive isolation is the prevention of interbreeds between the population of two different species.

Correct Option: B

Seasonal isolation refers to the differences in season of breeding that can isolate two varieties. Behavioural or ethological isolation refers to differences in behaviour like courtship rituals etc. to prevent mating. Mechanical isolation refers to the differences in the position, size and structure of animal genitalia which prevent reproductive contact and thus bring about isolation. Reproductive isolation is the prevention of interbreeds between the population of two different species.

Gause's hypothesis states that two different competing species cannot coexist together for a long in the same niche, one has to get eliminated by the other competing species, if they do coexist, then they do so as a result of niche differentiation, i.e. differentiation of then realized niches.

Correct Option: B

Gause's hypothesis states that two different competing species cannot coexist together for a long in the same niche, one has to get eliminated by the other competing species, if they do coexist, then they do so as a result of niche differentiation, i.e. differentiation of then realized niches.

rRNA occurs inside ribosomes and involved in protein synthesis, mRNA brings coded information from DNA to form polypeptides. tRNA takes part in transferring amino acids from cellular pool to episomes for polymerization to form polypeptides. Carl Woese gave the theory of life based on his discovery that the genes encoding ribosomal RNA are ancient and distributed over all lineages of life with little or no gene transfer. Therefore rRNA are commonly used to infer phylogeny.

Correct Option: B

rRNA occurs inside ribosomes and involved in protein synthesis, mRNA brings coded information from DNA to form polypeptides. tRNA takes part in transferring amino acids from cellular pool to episomes for polymerization to form polypeptides. Carl Woese gave the theory of life based on his discovery that the genes encoding ribosomal RNA are ancient and distributed over all lineages of life with little or no gene transfer. Therefore rRNA are commonly used to infer phylogeny.

There is no life on moon due to absence of water. There are many other reasons for being no life on moon, life insufficient oxygens, unsuitable temperature etc.

Correct Option: B

There is no life on moon due to absence of water. There are many other reasons for being no life on moon, life insufficient oxygens, unsuitable temperature etc.

Homologous organs have same basic structure and origin but they differ in their external appearance and function.

Correct Option: B

Homologous organs have same basic structure and origin but they differ in their external appearance and function.