Animals - Class 7 Science Revision Notes

• Parasites.
  • Examples of External Parasites(Ecto-parasites).
  • Examples of Internal Parasites(Endo parasites).
• Effects of Parasites on Animals.
• Methods of Controlling Livestock Parasites.
  • Methods of Controlling Human Intestinal Worms.

Parasites.

• This is an organism that fully depends on another organism for its survival.
• They either live on the body of the animal(External parasites) or inside the bodies on the animals(Internal parasites).

Examples of External Parasites(Ecto-parasites).

• Tick- Cattle, Sheep, Goats
• Mites- Oigs, Goats, Sheep, Poulty, Camel, Horses, Cattle, Rabbits.
• Flea- Pigs, Poulty, Rabbits.
• Louse-Poulty, Pigs, Sheep, Cattle, Horses
• Tsetse fly- All domestic animals

Examples of Internal Parasites(Endo-parasites).

• Liverfluke- Attacks liver and lungs of cattle, sheep, goats and pigs.
• Tapeworms- Attacks liver and small intestines of cattle, sheep, goats and pigs.
• Roundworms- Attacks small intestines,liver and lungs of cattle, sheep, goat, poultry and fish.
• Hookworms-Attacks the small intestine ofsheep and oats.
• Lungworms- Attacks the lungs,brain and stomach of cattle, sheep, goats and pigs

Effects of Parasites on Animals.

1. Leads to poor health of the animal .
2. Causes anemia as they sucks a lot of blood from the animal's body.
3. Causes irritation on the body of thee animal.
4. Leads to poor quality of the products.

Methods of Controlling Livestock Parasites.

• Rotational grazing-Both
• Dipping- External parasites.
• Spraying-External parasites.
• Deworming- Internal parasites;Involves drenching and dosing.
• Hand picking - External parasite.

Methods of Controlling Human Intestinal Worms.

• Proper sanitation.
• Proper washing of food that are eaten raw.
• Proper cooking.
• Regular deworming.