If the head of the cockroach is removed, it may live for a few days because:
1. | The cockroach does not have a nervous system |
2. | The head holds a small proportion of the nervous system while the rest is situated along the ventral part of its body |
3. | The head holds 1/3rd of the nervous system while the rest is situated along the dorsal part of its body |
4. | The supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen |
Which of the following statements is true for cockroaches?
1. The total number of ovarioles are five in both ovaries
2. The larval stage is called naiad
3. Anal styles are absent in females
4. They are ureotelic
Select the correct statement with respect to Periplaneta americana.
1. Paurometabolous development with 9-10 nymphal stages.
2. A pair of spermatheca is present in the 6th segment of only female cockroach.
3. Anal styles present exclusively in males are attached to 10th tergite.
4. Mesothoracic wings are opaque, dark and leathery in appearance and are used in flight.
Secretions from these help in digestion of food in cockroach. ‘These’ represents the
(1) Crop
(2) Gizzard
(3) Hepatic caeca
(4) Malpighian tubules
Choose the incorrect match with respect to total number of following structures in cockroach
1. Spiracles – 10 pairs
2. Gastric caeca – 6-8
3. Malpighian tubules – 100-150
4. Ommatidia – 2000
Which of the following does not behave as a sense organ in cockroach?
1. Maxillary palps
2. Labial palps
3. Anal cerci
4. Phallomeres
Choose the incorrect statement with respect to cockroach
1. Haemocoel contains haemolymph which contains colourless plasma and haemocytes
2. Nervous system consists of segmentally arranged ganglia, six in thorax and nine in abdomen
3. Mushroom gland is present in 6th – 7th abdominal segment in male cockroach
4. Proventriculus has an outer layer of thick circular muscles and inner thick cuticle forming teeth
Which of the following is incorrect statement with respect to cockroach?
1. The nymph grows by moulting about 13 times to reach the adult form
2. The outermost covering of spermatophore is formed by secretions of spermatheca
3. Mushroom glands are accessory reproductive glands in a male
4. Each compound eye consists of nearly 2000 ommatidia
Alary muscles play an important role in
1. Circulation of blood
2. Respiration
3. Body movement
4. Peristalsis
Exoskeleton of each segment in cockroach consists
1. Dorsal tergum and a ventral sternum
2. Dorsal sternum and a ventral tergum
3. Sternum only
4. Tergum only