The given figure shows open circulatory system of cockroach. Identify the structure that facilitate the flow of haemolymph by its contraction and relaxation
$A$
$B$
$C$
All of these
Identify $X$ the from the figure.
Match List $I$ with List $II$ related to digestive system of cockroach.
List $I$ | List $II$ |
$A$ The structures used for storing of food | $I$ Gizzard |
$B$ Ring of $6-8$ blind tubules at junction of foregut and midgut. | $II$ Gastric Caeca |
$C$ Ring of $100-150$ yellow coloured thin filaments at junction of midgut and hindgut. | $III$ Malpighian tubules |
$D$ The structures used for grinding the food. | $IV$ Crop |
Choose the correct answer from the options given below:
Which is correct sequence for ootheca formation?
$(1)$ Ova enter into genital chamber
$(2)$ Cover around a fertilized eggs.
$(3)$ Ovum fertile by sperms.
Which of the following statement(s) is/are correct about nervous system of cockroach ?
($i$) It consists of a series of fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
($ii$) There are six ganglia lie in the thorax, and three in the abdomen.
($iii$) The sense organs are antennae, eyes, maxillary pulps, labial pulps and anal cerci etc.
($iv$) Each eye consists of about $5000$ hexagonal ommatidia.
Mark the odd one in each series:
Maxilla; mandible; labrum; antennae