Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth:

Tick mark of the false statement with respect to Periplaneta, Americana.

Identify correctly matched (a), (b), (c):

1. Colon, Mesentron, Crop
2. Ileum, Mesentron, Gizzard
3. Ileum, Mesentron, Crop
4. Colon, Mesentron, Gizzard

Which of the following statement is incorrect with respect to cockroach?

1. The exoskeleton of each segment consists of four plate-like pieces called sclerites

2. Labium bears tactile and gustatory sensory setae

3. In cockroach, malpighian tubules, fat bodies, nephrocytes, cuticle, and uricose glands (in some species) Helps in excretion

4. Internally mesenteron is lined by cuticle and covered by a very thin and transparent peritrophic membrane

Which of the following statement is not true with respect to Periplaneta?

(1) The gizzard part of alimentary canal has an outer layer of thick longitudinal muscles and inner thin cuticle forming six highly chitinous plates called teeth

(2) The hindgut is broader than midgut and is differentiated into ileum, colon and rectum

(3) If the head of cockroach is cut off, it will still live for as long as one week

(4) Each Malpighian tubule is lined by glandular and ciliated cells. These are located at the junction between midgut and hindgut

Digestive system of cockroach is not characterised by

(1) A muscular gizzard provided with six cuticular teeth in armarium

(2) Presence of twenty blind glandular hepatic caeca at posterior end of mesenteron

(3) Presence of six rectal papillae helping in absorption of water and salts

(4) Presence of cuticular lining in foregut and hind gut

Given below is a diagrammatic representation of alimentary canal of cockroach.

Choose the option which is not correct with respect to the function of labelled structure A, B, C and D

(1) Oesophagus opens into a sac like structure labelled as A used for storing of food.

(2) B helps in grinding of food because it have an outer thick cuticular layer and inner muscular layer.

(3) C is present at the junction of foregut and midgut and secretes digestive juice.

(4) D helps in removal of excretory product from haemolymph.

Which of the following statements is incorrect w.rt. cockroach?

(1) In both sexes, the 10th segment of abdomen bears a pair of jointed filamentous structures called anal cerci

(2) Hind wings are transparent and are used in flight

(3) Gizzard has inner layer of thick circular muscles and thick outer layer of cuticle which
forms six chitinous plates called teeth

(4) Haemolymph is composed of colourless plasma and haemocytes

Secretions from these help in digestion of food in cockroach. ‘These’ represents the

(1) Crop

(2) Gizzard

(3) Hepatic caeca

(4) Malpighian tubules

In cockroach, identify the parts of the foregut in correct sequence: