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Q. In arthropods why isn't gas exchange done through cutaneous diffusion?
In arthropods the impermeability of the exoskeleton makes the way of gases difficult. In addition the new methods of respiration present in arthropods were preserved by evolution because they were more capable for those animals.
What is meant by the arch reflex? In some situations the movement of the skeletal striated muscles does not depend upon commands of the superior motor neurons, i.e., it is not
How are the main classes of arthropods classified according to the presence of larval stage in their embryonic development? In crustaceans there are species with direct and oth
MUTATION THEORY (Hugo de Vries 1901) - New species are not formed by continuous variations but sudden appearance of variations i.e., mutation. Mutation are heritable and per
Nuclear transfer method: Nuclear transfer will extend the range of species in which gene targeting will be possible and thereby provide better models to test treatments for human
S p e c i a l Uses Biogas Biogas is an important renewable energy resource for rural areas. Generation of bio-gas from dung and urine is a very simple and cost-effective
Explain the term- pedon and polypedon The characteristics of soil do not change vertically downwards only, there are lateral variations also as soil is a three dimensional body.
Determine about the scales developed by golden Several other scales have been developed by Golden and various collaborators, all of which are based on different ways of scoring
Cerebral Palsy Cerebral palsy is a non-progressive neuromuscular disorder characterised by disorder of strength, muscle control, posture or movement due to brain injury, befor
Express the term in brief - Protonephridia. An osmoregulatory-excretory structure found in some invertebrates. Also known as a flamecell, this tubule is closed at its distal en
In a numeric pyramid is it possible for the base to be smaller than the other levels? Ever since the numeric pyramid represents the quantity of individuals in each trophic leve
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