What do you understand by invasive species? How does it affect lo…

Question

What do you understand by invasive species? How does it affect local population?

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Answer

New species are introduced into any ecosystem either accidentally or intentionally.
Such introduction proves harmful for existing species.
Sometimes even local species get extinct.
If such extinction happens, then this new species is called an invasive species. E.g. Parthenium or carrot grass, Lantana and water hyacinth (Eichhornia) are such invasive plant species.
Nile perch which is a predator fish in Lake Victoria cause harm to 200 local species of Cichlid fish.
Clarias gariepinus (African catfish) was brought to India for aquaculture purpose. This catfish species has proved harmful to endemic catfish varieties.
Since there is lack of local predator, this alien species survives and cause harmful effect on local species.

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Column A (Scientist)	Column B (Theory)
(1) Dixon and Joly	(a) Starch-sugar inter conversion
(2) Steward	(b) Osmotic absorption theory
(3) Atkins and Pristley	(c) Non-osmotic absorption theory
(4) Kramer and Thimann	(d) Cohesion tension theory

Cardiovascular disorders	Symptom
Coronary Artery Diseases (CAD)	Deposition of calcium, fat, cholesterol and ———————
—————-	Pain in chest resulting from reduction in the blood supply to the cardiac muscles.
Silent Heart Attack	Myocardial infarction without ———————-

Organism	Habitat	Respiratory surface/organ
1. Insects	Terrestrial	—————
2. Amphibian tadpoles of frog, salamanders	—————-	—————-
3. Fish	Aquatic	————–
4. Reptiles, Birds and Mammals	—————-	—————-