Commercial silk is obtained from :
cocoon/ pupa
caterpiller
adult moth
both egg and adult moth
A.
cocoon/ pupa
Commercial silk is obtained by putting cocoons i.e. caterpiller covered by silk thread) in hot water or treating them with fumigation. The pupae are killed and the cocoons are assorted according to their colours. After assorting the thread is first unwinded and then winded with the help of wheels.
In which of the following class of Annelida, one pair ovaries and several pair testes are found ?
Archiannelida
Hirudinea
Oligochaeta
Polychaeta
Ambulacral grooves are absent in the living forms of the Class
Crinoidea
Asteroidea
Ophiuroidea
Echinodermata
The sites of the first, second and third moulting of the Ascaris larva are respectively
soil, lung and intestine
liver, stomach and intestine
soil, alveoli and alveoli
soil, intestine and lung
As per classification which of the following is correct ?
Ascaris, Pheretima, Grasshopper
Hydra, Pterido, Leucosolenia
Starfish, Grasshopper, Solen
Pila, Dentalium, Octopus
Which of the following Phyla are included in Enterozoa?
Annelida, Mollusca, Porifera
Echinodermata, Hemichordata, Porifera
Mollusca, Arthropoda, Hemichordata
Porifera, Mollusca, Arthropoda
Identify the correct statement
In amniotes last nerve is spinal accessory
In non- amniotes last nerve is vagus.
Optic is shortest nerve
Olfactory nerves has mixed fibres.
Class Crustacea has following features :
Cephalothorax, book lungs, chitinous exoskeleton
Head and thorax, biramous appendages, book lungs
Head and thorax, book lungs, chitinous exoskeleton
Cephalothorax, biramous appendages, gills
