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Insects

Insects. Mr. Jeff Peterson Fulbright Teacher from Indiana, USA. Insects. Myriapoda. Insects. Difference between centipede and millipede. Insects. Insecta Cockroach The body is divided into head, thorax and abdomen. The head bears a pair of antennae and a pair of compound eyes.

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Insects

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  1. Insects Mr. Jeff Peterson Fulbright Teacher from Indiana, USA

  2. Insects • Myriapoda

  3. Insects Difference between centipede and millipede

  4. Insects • Insecta • Cockroach • The body is divided into head, thorax and abdomen. • The head bears a pair of antennae and a pair of compound eyes. • The antennae serves as a sensory organ. • The thorax is divided into 3 segments.

  5. Insects • Insecta • Cockroach • Each segment has a pair of jointed legs. • Two pairs of wings are present in the thorax region. • The abdomen consist of 11 segments out of which the last segment is underdeveloped.

  6. Insects • Complete Fig 5.9 Cockroach, page 37

  7. Insects • Digestive System – Alimentary Canal • The mouth leads to buccal cavity (which has pair of salivary glands) • Complete Fig 5.10 page 38

  8. Insects

  9. Insects

  10. Insects • Circulatory System • Cockroach has an open circulatory system. • Blood of cockroach is white in color because the red pigment is dissolved in the plasma. • A simple tube consisting of thirteen chambers present on the dorsal surface as a heart.

  11. Insects • Respiratory System • It consist of a network of fine tubes called trachea. • Trachea branches into minute tracheoles which reach all parts of the body. • Air reaches the trachea through the minute hole found along the sides of the body of the insect.

  12. Insects • Respiratory System

  13. Insects • Respiratory System • These are called spiracles on stigma. • In the cockroach there are 10 pairs of stigmata, 2 on the thorax and 8 on the abdomen.

  14. Insects • Excretory System • Excretory organs are represented by a number of finely coiled tubes called malpighian tubules. • They remove the waste material from blood and discharge into the gut.

  15. Insects • Reproductive System • Sexes are separate. • Female has pair of ovaries called the female reproductive organ. • Male has a pair of testes which produce sperm, called the male reproductive organ.

  16. Insects • Reproductive System • Fertilization occurs in the oviduct. • Embryo formed releases nymph. Which after several molting, forms adult.

  17. Insects • Ootheca • The egg case of the cockroach is called ootheca. • It has 16 eggs arranged in 2 rows.

  18. Insects • Nymph • The young one of the cockroach is called nymph. • It resembles an adult except in size and color. • It is pale in color with large eyes, molts several times to become an adult.

  19. Insects

  20. Insects

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