Grazing food chain 1.depicted as grass —goat — man 2.Begins with producers / autotrophs. All animals depend on plants for their food Read More …
Category: Class 12
Differentiate between an upright and inverted pyramid.
Upright pyramid 1. Producers are more in numbers than the herbivores and herbivores more in number than carnivores. 2. Pyramid of energy is Read More …
Describe the process of transcription in bacteria.
RNA polymerase binds to the promoter and initiates transcription (initiation). It uses nucleosides triphosphates as substrate and polymerises in a template dependent fashion following Read More …
Which disease there is point mutation , where there is single base pair change in betaglobulin chain of haemoglobin?
Sickle cell anaemia
The sex determination mechanism in grasshopper is : a) XY type b)XO type c)d)ZW type ZZ type
insects it is XO type , so b)
Rohit has attained puberty, but there is still a significant decrease in his hypothalamic hormones. How will it affect his reproductive growth.?
If hypothalamic hormones will decrease then it will affect spermatogenesis and spermiation in him. Hypothalamus releases GnRH ( Gonadotrophin releasing Hormones ) which stimulate Read More …
Give diagrammatic sectional view of the human ovary showing the stages of development in ovarian follicles
Draw a diagram of female reproductive system
Tropical forests account for greater biodiversity than temperate regions . Give Reasons.
Speciation is a function of time. Temperate regions were subjected to frequent glaciations in the past while tropics have remained somewhat undisturbed for millions Read More …
Differentiate between Autogamy and Xenogamy.
Autogamy 1.transfer of pollen grains from the anther to stigma of same flower. 2. genetically same type of pollens are brought to the Read More …