Question

aquatic weeds defin
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Answer 1

Aquatic weeds are unwanted and undesirable vegetation that reproduce and grow in water. If left unchecked may choke the water body posing a serious menace to pisciculture.

• They provide breeding grounds and harbour predatory insects.  
• Provide shelter to predatory and weed fishes and molluscs.
• They restrict free movement of fry.
• They cause obstruction during netting.
• Limit living space for fish  
• Limit plankton production
• Reduce sunlight penetration and nutrients.
• Upsets the equilibrium of physico-chemical properties of water.
• Cause imbalance in dissolved oxygen budget.
• Promote accumulation of deposits leading to siltation
• Reduce water movement, thereby limits oxygen circulation in water.
• Some weeds release toxic gases that cause fish death and add foul smell to water.

Answer 2

Answer:

In this method of integration by substitution, any given integral is transformed into a simple form of integral by substituting the independent variable by others. Take for example an equation having an independent variable in x, i.e. ∫sin (x3).