Which part of ovary in mammals acts as an endocrine gland after ovulation?
Graaffian follicle
Stroma
Germinal epithelium
Germinal epithelium
A.
Graaffian follicle
During ovulation, the mature follicle or Graafian follicle bursts and the ovum is released. After ovulation, the granulosa cells and the interstitial cells form a mass of large and yellowish conical cells. This is named as Corpus luteum which serves as a temporary endocrine gland by releasing progesterone and estrogen.
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
Molecular basis of organ differentiation dpends on the modulation in transcription by
RNA polymerase
ribosome
transcription factor
transcription factor
One of endangered species of Indian medicinal plants is that of
Podophyllum
Ocimum
Garlic
Garlic
Geometric representation of age structure is a characteristic of
Biotic community
Population
Landscape
Landscape
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
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
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
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
