The central nervous system of cockroach includes
1. Brain and ganglionated dorsal nerve cord
2. Brain and ganglionated ventral nerve cord
3. Brain and hollow nerve cord
4. Dorsal solid nerve cord only
Sense organs of cockroach include
1. Compound eyes
2. Johnston's organ
3. Osphradium
4. Spiracles
Which one of the following is the true description of an animal concerned?
1. | Cockroach – 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen) |
2. | Earthworm – The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard, and intestine |
3. | Frog – Body divisible into three regions -head, neck, and trunk |
4. | Rat – Left kidney is slightly higher in position than the right one |
In frogs, cloaca receives
1. Faecal matter
2. Gametes
3. Unine
4. All of these
Thin tubes that carry oxygen from the air to all the parts in cockroach constitute
1. Tracheal system
2. Haemolymph
3. Lungs
4. Gills
In cockroach, foregut comprises of
1. Pharynx, oesophagus, crop and gizzard
2. Mesenteron, crop and gizzard
3. lleum, colon and rectum
4. Pharynx, oesophagus and rectum
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
Alary muscles play an important role in
1. Circulation of blood
2. Respiration
3. Body movement
4. Peristalsis
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
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