Structural Organisation in Animals

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DÏFFËRËÑÇËS BËTWËËÑ MÅLË & FËMÅLË ÇØÇKRØÅÇHËS

MALE

Female

Larger size

Smaller size

Wings extend beyond the tip of

the abdomen.

Wings do not extend beyond the

tip of abdomen.

Narrow abdomen

Broad abdomen

Anal styles present (AIPMT 2012)

Absent

Brood pouch absent

Present

ÅÑÅTØMÝ ØF ÇØÇKRØÅÇH

DÏGËSTÏVË SÝSTËM

Alimentary canal has 3 parts: Foregut, midgut & hindgut.

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Foregut: It is lined by cuticle. It includes

Mouth ¾® Pharynx ¾® Oesophagus ¾® Crop (to store food) ¾®

Gizzard(proventriculus).

Gizzard helps in grinding the food. It has an outer layer of thick circular

muscles and thick inner cuticle forming 6 chitinous plates (teeth).

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Midgut (Mesenteron): 6-8 tubules (hepatic or gastric caecae) are seen

at the junction of foregut & midgut. They secrete digestive juice. At the

junction of mid gut & hindgut, there are 100-150 yellow coloured thin

filamentous Malpighian tubules.

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Hindgut: It is broader than midgut. Hindgut includes ileum, colon and

rectum. Rectum opens out through anus.

Salivary gland

Pharynx

Salivary

reservoir

Oesophagus

Crop

Gizzard

Hepatic caeca

Mesenteron

or midgut

Malpighian

tubules

Ileum

Colon

Rectum