In maize, hybrid vigour is exploited by
bombarding the seeds with DNA
crossing of two inbred parental lines
harvesting seeds from the most productive plants
harvesting seeds from the most productive plants
B.
crossing of two inbred parental lines
Hybrid varieties were first developed in maize, which is a cross-pollinated crop. In such crops, the parents of hybrid varieties are, ordinarily, inbred lines. A inbred line is a nearly homozygous line produced by continuous inbreeding in a cross-pollinated crop and is maintained by strict inbreeding. In maize, hybrid vigour or heterosis is exploited by crossing of two inbred parental lines.
In cloning of cattle a fertillized egg is taken out of the mother’s womb and
the egg is divided into 4 pairs of cells which are implanted into the womb of other cows
in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cow
in the eight cell stage the individual cells are separated under electrical field for further development in culture media
in the eight cell stage the individual cells are separated under electrical field for further development in culture media
Molecular basis of organ differentiation dpends on the modulation in transcription by
RNA polymerase
ribosome
transcription factor
transcription factor
Geometric representation of age structure is a characteristic of
Biotic community
Population
Landscape
Landscape
One of endangered species of Indian medicinal plants is that of
Podophyllum
Ocimum
Garlic
Garlic
One of the important consequences of geographical isolation is
no change in the isolated fauna
preventing speciation
speciation through reproductive isolation
speciation through reproductive isolation
The concept of chemical evolution is based on
cyrstallization of chemicals
interaction of water, air and clay under intense heat
effect of solar radiation on chemicals
effect of solar radiation on chemicals
Which one of the following statements is correct?
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil.
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil.
Among the human ancestors the brain size was more that 1000 CC in
Homo neander-thalensis
Homo erectus
Ramapithecus
Ramapithecus
Which part of ovary in mammals acts as an endocrine gland after ovulation?
Graaffian follicle
Stroma
Germinal epithelium
Germinal epithelium
