What is high altitude sickness? Write its symptoms.
High altitude sickness is experienced by the people going to high altitudes, where oxygen concentrations are low and the body system reacts by developing the symptoms like nausea, headache and heart palpitations.
Give a suitable example for commensalism.
An interaction between blue whale and the barancle growing on its back is an example of commensalism (interspecific relation) between them.
Define ectoparasite and endoparasite and give suitable examples.
Ectoparasite feeds on the external surface of the host organism, e.g., Lice on humans and ticks on dogs. Many marine fish are infested with ectoparasitic copepods.
Endoparasites live inside the host body at different sites (liver, kidney, lungs, red blood cells, etc.). Such as malarial parasites P. vivax, gut parasites, i.e., tapeworm.
Their morphological and anatomical features of endoparasites are greatly simplified while emphasising their reproductive potential.
What is brood parasitism? Explain with the help of an example.
Brood parasitism is the phenomenon in which an organism (parasite) lays eggs on the nest of other organism (host).
e.g., Cuckoo (koel) bird lays its eggs in the nest of its host and lets the host incubate them. The eggs of the parasitic bird resemble the host's egg in size and colour to reduce the chances of the host bird detecting the foreign eggs and ejecting them from the nest.
Why are coral reefs not found in the regions from West Bengal to Andhra Pradesh but are found in Tamil Nadu and on the east coast of India?
Coral reefs are found in zone with high salt concentration (salinity), optimal temperature and with a less siltation condition which fairly facilitate to colonise corals. In case of high siltation and water flow, coral reef do not colonise.