Beta () diversity refers to diversity
within a community
between communities
between two eco zones
within a population
Which one of the following antibiotics kills bacterial cells by inhibiting the polymerisation of peptidoglycan?
Aminoglycosides
Fluoroquinolones
Quinines
Penicillins
Indicate the correct sequence during spermatogenesis.
Spermatozoa spermatogonia spermatid spermatocyte
Spermatogonia spermatocyte spermatid spermatozoa
Spermatid spermatocyte spermatozoa spermatogonia
Spermatocyte spermatozoa spermatid spermatogonia
Egg in female gametophyte is accompanied by
antipodal cells
synergids
definitive nucleus
tube nucleus
Which one of the following organisms is not used as a biocontrol agent?
Bacillus sphaericus
Trichoderma viride
Bacillus thuringiensis
Bacillus subtilis
Which one of the following statements is relevant to sex linked characters?
They always follow criss-cross inheritance
They do not follow criss-cross inheritance
They are mostly present on Y-chromosome
They are only present on X-chromosome
A.
They always follow criss-cross inheritance
Sex-linked characters are the X-linked characters. Their inheritance is due to the X-linked genes. The X-linked recessive characters follow criss-cross pattern of inheritance or skip-generation inheritance. In criss-cross inheritance, character is inherited to the second generation through the carrier of first generation.
Which one of the following insecticides is of plant origin?
Ecdysone
Rotenone
Parathion
Malathion
Archaeopteryx is a connecting link between
pisces and amphibians
amphibians and reptiles
reptiles and birds
birds and mammals