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EGGS OF INSECT
This eggs is centrolecithal and it is elliptical. It diameter is 2-3 mm.
It has two eggs membrane i.e. vitelline membrane and chitinous capsule.
The chitinous capsule has a minute pore, called micropile. The sperm enters through this micropile for fertilisation.
The yolk free peripheral ooplasm is called as periplasm.
Protozoans ingest food by phagocytosis, and consequently, the ingested food is surrounded by a plasma membrane creating a food vacuole, or phagosome. Digestion does not start until
Admission Procedure From the time the child and his family enter the hospital doors, the admission procedure should be carried out in a friendly and efficient manner. Admiss
What is Physical Accommodation Physical Accommodation is the actual physical deformation in the lens power. It is measured in diopters, e.g., if the focussing power of the eye
MA L THU S THEORY OF HUMAN POPULATION GROWTH - Malthus put forward in 1778. 1. Population grows in geometrical ratio, where as the means grow in arithmetical ratio.
Which one of the following is used as vector for cloning genes into higher organisms ? 1. Baculovirus 2. Salmonella typhimurium 3. Rhizopus nigricans 4. Retrovirus
Hemicellulose In plant cell walls, the most abundant compound present is α-cellulose with long fibers embedded in a matrix of cementing compounds (matrix polysaccharides). Thes
Fusion of Sperm and the Egg After the penetration of the extracellular layers by sperm there occurs the fusion of the - sperm plasma membrane with that of the egg. In mammals
SCOPE OF BIOLOGY- Present century is witnessing explosion of information in modem biology directly related to life and health. Issues like global warming, pollution, populat
Problem of Polarity The control of polarity in regenerating coelentrates like hydra has received much attention for many years. You are already aware that while a hydra is cu
Q. How do the bacteria reproduce? Bacteria reproduce by binary fission termed as scissiparity. Some bacteria however present a kind of sexual reproduction transformation, conju
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